Ciprofloxacin Hydrochloride description, usages, side effects, indications, overdosage, supplying and lots more!

Ciprofloxacin Hydrochloride






Fluoroquinolones, including Ciprofloxacin Tablets, are associated with an increased risk of tendinitis and tendon rupture in all ages. This risk is further increased in older patients usually over 60 years of age, in patients taking corticosteroid drugs, and in patients with kidney, heart or lung transplants (See WARNINGS).





Dose (mg)
Serum Concentrations
Under Curve

Steady-state Pharmacokinetic Parameters
Following Multiple Oral and I.V. Doses

AUC (mcg•hr/mL)
Cmax (mcg/mL)
500 mg
  q12h, P.O. 
400 mg
  q12h, I.V. 
750 mg
  q12h, P.O. 
400 mg
    q8h, I.V. 





Information related to pharmacokinetics in pediatric patients is approved for Bayer Pharmaceutical Corporation's ciprofloxacin drug products. However, due to Bayer's marketing exclusivity rights, this drug product, produced by Hikma Pharmaceuticals, is not labeled for pediatric use, except for inhalational anthrax (post-exposure). in vitro In vitro in vitro.



in vitro but their clinical significance is unknown

in vitro
Staphylococcus haemolyticus
Staphylococcus hominis
Streptococcus pneumoniae


Enterobacteriaceae, Enterococcus faecalis,Staphylococcus Streptococcus pneumoniae, Streptococcus pyogenes, Pseudomonas aeruginosa a
 MIC (μg/mL) Interpretation
≤ 1
Susceptible   (S)    
Intermediate  (I)    
≥ 4
Resistant       (R)    


Haemophilus influenzae Haemophilus parainfluenzaeb
MIC (μg/mL) Interpretation
≤ 1    
Susceptible  (S)    

b Haemophilus influenzae Haemophilus parainfluenzae Haemophilus 1

Neisseria gonorrhoeae c
MIC (μg/mL) Interpretation
≤ 0.06
Susceptible    (S)    
0.12 – 0.5
Intermediate  (I)    
≥ 1
Resistant       (R)    


Organism   MIC (μg/mL)
E. faecalis
ATCC 29212    
0.25   – 2
   E. coli
ATCC 25922    
0.004 – 0.015
H. influenzae a
ATCC 49247    
0.004 – 0.03
P. aeruginosa
ATCC 27853    
0.25   – 1
S. aureus
ATCC 29213    
0.12   – 0.5
   C. jejuni b
ATCC 33560    
0.06 – 0.25 and 0.03 – 0.12    
N. gonorrhoeae c    
ATCC 49226    
0.001 – 0.008

a H. influenzae Haemophilus 1
b C. jejuni oo2
c N. gonorrhoeae 2o33

Enterobacteriaceae Enterococcus faecalis StaphylococcusStreptococcus pneumoniae Streptococcus pyogenes Pseudomonas aeruginosaa
Zone Diameter (mm) Interpretation
≥ 21
Susceptible   (S)    
16 – 20
Intermediate  (I)    
≤ 15
Resistant       (R)    

a 2

Haemophilus influenzae Haemophilus parainfluenzaeb :

Zone Diameter (mm) Interpretation
≥ 21
Susceptible  (S)    

b Haemophilus influenzae Haemophilus parainfluenzae Haemophilus 3

Neisseria gonorrhoeaec
Zone Diameter (mm) Interpretation
Susceptible   (S)    
28 – 40
Intermediate  (I)    
≤ 27
Resistant       (R)


Zone Diameter (mm)
   E. coli
ATCC 25922    
30 – 40
H. influenzae a
ATCC 49247    
34 – 42
N. gonorrhoeae b
ATCC 49226    
48 – 58
P. aeruginosa
ATCC 27853    
25 – 33
S. aureus
ATCC 25923    
22 – 30

a H. influenzae Haemophilus 3
b N. gonorrhoeae


Ciprofloxacin Tablets, USP are indicated for the treatment of infections caused by susceptible strains of the designated microorganisms in the conditions and patient populations listed below. Please see DOSAGE AND ADMINISTRATION for specific recommendations.

Urinary Tract Infections Escherichia coli, Klebsiella pneumoniae, Enterobacter cloacae, Serratia marcescens, Proteus mirabilis, Providencia rettgeri, Morganella morganii, Citrobacter diversus, Citrobacter freundii, Pseudomonas aeruginosa, Staphylococcus epidermidis, Staphylococcus saprophyticus, Enterococcus faecalis.

Acute Uncomplicated Cystitis in females
Escherichia coli Staphylococcus saprophyticus.

Chronic Bacterial Prostatitis
Escherichia coli Proteus mirabilis.

Lower Respiratory Tract Infections
Escherichia coli, Klebsiella pneumoniae, Enterobacter cloacae, Proteus mirabilis, Pseudomonas aeruginosa, Haemophilus influenzae, Haemophilus parainfluenzae, Streptococcus pneumoniae. Moraxella catarrhalis

Streptococcus pneumoniae.

Acute Sinusitis
Haemophilus influenzae, Streptococcus pneumoniae, Moraxella catarrhalis.

Skin and Skin Structure Infections
Escherichia coli, Klebsiella pneumoniae, Enterobacter cloacae, Proteus mirabilis, Proteus vulgaris, Providencia stuartii, Morganella morganii, Citrobacter freundii, Pseudomonas aeruginosa, Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus pyogenes.

Bone and Joint Infections
Enterobacter cloacae, Serratia marcescens, Pseudomonas aeruginosa.

Complicated Intra-Abdominal Infections
Escherichia coli, Pseudomonas aeruginosa, Proteus mirabilis, Klebsiella pneumoniae, Bacteroides fragilis.

Infectious Diarrhea
Escherichia coli Campylobacter jejuni, Shigella boydii , Shigella dysenteriae, Shigella flexneri Shigella sonnei

Typhoid Fever (Enteric Fever)
Salmonella typhi.

Uncomplicated cervical and urethral gonorrhea
Neisseria gonorrhoeae. Complicated Urinary Tract Infections and Pyelonephritis Escherichia coli.

Inhalational anthrax Bacillus anthracis.


Pseudomonas aeruginosa


Ciprofloxacin is contraindicated in persons with a history of hypersensitivity to ciprofloxacin, any member of the quinolone class of antimicrobial agents, or any of the product components.
Concomitant administration with tizanidine is contraindicated. (See PRECAUTIONS: Drug Interactions .)


Fluoroquinolones, including Ciprofloxacin Tablets, are associated with an increased risk of tendinitis and tendon rupture in all ages. This adverse reaction most frequently involves the Achilles tendon, and rupture of the Achilles tendon may require surgical repair. Tendinitis and tendon rupture in the rotater cuff (the shoulder), the hand, the biceps, the thumb, and other tendon sites have also been reported. The risk of developing fluoroquinolone-associated tendinitis and tendon rupture is further increased in older patients usually over 60 years of age, in patients taking corticosteroid drugs, and in patients with kidney, heart or lung transplants. Factors, in addition to age and corticosteroid use, that may independently increase the risk of tendon rupture include strenuous physical activity, renal failure, and previous tendon disorders such as rheumatoid arthritis. Tendinitis and tendon rupture have also occurred in patients taking fluoroquinolones who do not have the above risk factors. Tendon rupture can occur during or after completion of therapy; cases occurring up to several months after completion of therapy have been reported. Ciprofloxacin Tablets should be discontinued if the patient experiences pain, swelling, inflammation or rupture of a tendon. Patients should be advised to rest at the first sign of tendinitis or tendon rupture, and to contact their healthcare provider regarding changing to a non-quinolone antimicrobial drug.

Nursing Mothers


Ciprofloxacin should be used in pediatric patients (less than 18 years of age) only for infections listed in the INDICATIONS AND USAGE section. An increased incidence of adverse events compared to controls, including events related to joints and/or surrounding tissues, has been observed. (See ADVERSE REACTIONS .)

In pre-clinical studies, oral administration of ciprofloxacin caused lameness in immature dogs. Histopathological examination of the weight-bearing joints of these dogs revealed permanent lesions of the cartilage. Related quinolone-class drugs also produce erosions of cartilage of weight-bearing joints and other signs of arthropathy in immature animals of various species. (See ANIMAL PHARMACOLOGY .)


  • fever, rash, or severe dermatologic reactions (e.g., toxic epidermal necrolysis, Stevens-Johnson syndrome);
  • vasculitis; arthralgia; myalgia; serum sickness;
  • allergic pneumonitis;
  • interstitial nephritis; acute renal insufficiency or failure;
  • hepatitis; jaundice; acute hepatic necrosis or failure;
  • anemia, including hemolytic and aplastic; thrombocytopenia, including thrombotic thrombocytopenic purpura; leukopenia; agranulocytosis; pancytopenia; and/or other hematologic abnormalities.

The drug should be discontinued immediately at the first appearance of a skin rash, jaundice, or any other sign of hypersensitivity and supportive measures instituted (See PRECAUTIONS: Information for Patients and ADVERSE REACTIONS ).

Clostridium difficile associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including Ciprofloxacin Tablets, and may range in severity from mild diarrhea to fatal colitis. Treatment with antibacterial agents alters the normal flora of the colon leading to overgrowth of C. difficile .

C. difficile produces toxins A and B which contribute to the development of CDAD. Hypertoxin producing strains of C. difficile cause increased morbidity and mortality, as these infections can be refractory to antimicrobial therapy and may require colectomy. CDAD must be considered in all patients who present with diarrhea following antibiotic use. Careful medical history is necessary since CDAD has been reported to occur over two months after the administration of antibacterial agents.

If CDAD is suspected or confirmed, ongoing antibiotic use not directed against C. difficile may need to be discontinued. Appropriate fluid and electrolyte management, protein supplementation, antibiotic treatment of C. difficile, and surgical evaluation should be instituted as clinically indicated.



Central Nervous System

WARNINGS, Information for Patients, Drug Interactions

Renal Impairment



ADVERSE REACTIONS/Post-Marketing Adverse Events


  • to contact their healthcare provider if they experience pain, swelling, or inflammation of a tendon, or weakness or inability to use one of their joints; rest and refrain from exercise; and discontinue Ciprofloxacin Tablets treatment. The risk of severe tendon disorder with fluoroquinolones is higher in older patients usually over 60 years of age, in patients taking corticosteroid drugs, and in patients with kidney, heart or lung transplants.
  • that antibacterial drugs including Ciprofloxacin Tablets should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When Ciprofloxacin Tablets are prescribed to treat a bacterial infection, patients should be told that although it is common to feel better early in the course of therapy, the medication should be taken exactly as directed. Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by Ciprofloxacin Tablets or other antibacterial drugs in the future.
  • that ciprofloxacin may be taken with or without meals and to drink fluids liberally. As with other quinolones, concurrent administration of ciprofloxacin with magnesium/aluminum antacids, or sucralfate, Videx® (didanosine) chewable/buffered tablets or pediatric powder, other highly buffered drugs, or with other products containing calcium, iron or zinc should be avoided. Ciprofloxacin may be taken two hours before or six hours after taking these products. Ciprofloxacin should not be taken with dairy products (like milk or yogurt) or calcium-fortified juices alone since absorption of ciprofloxacin may be significantly reduced; however, ciprofloxacin may be taken with a meal that contains these products.
  • that ciprofloxacin may be associated with hypersensitivity reactions, even following a single dose, and to discontinue the drug at the first sign of a skin rash or other allergic reaction.
  • that photosensitivity/phototoxicity has been reported in patients receiving quinolones. Patients should minimize or avoid exposure to natural or artificial sunlight (tanning beds or UVA/B treatment) while taking quinolones. If patients need to be outdoors while using quinolones, they should wear loose-fitting clothes that protect skin from sun exposure and discuss other sun protection measures with their physician. If a sunburn-like reaction or skin eruption occurs, patients should contact their physician.
  • that peripheral neuropathies have been associated with ciprofloxacin use. If symptoms of peripheral neuropathy including pain, burning, tingling, numbness and/or weakness develop, they should discontinue treatment and contact their physicians.                       
  • that ciprofloxacin may cause dizziness and lightheadedness; therefore, patients should know how they react to this drug before they operate an automobile or machinery or engage in activities requiring mental alertness or coordination.
  • that ciprofloxacin increases the effects of tizanidine (Zanaflex®). Patients should not use ciprofloxacin if they are already taking tizanidine.
  • that ciprofloxacin may increase the effects of theophylline and caffeine. There is a possibility of caffeine accumulation when products containing caffeine are consumed while taking quinolones.
  • that convulsions have been reported in patients receiving quinolones, including ciprofloxacin, and to notify their physician before taking this drug if there is a history of this condition.
  • that ciprofloxacin has been associated with an increased rate of adverse events involving joints and surrounding tissue structures (like tendons) in pediatric patients (less than 18 years of age). Parents should inform their child’s physician if the child has a history of joint-related problems before taking this drug. Parents of pediatric patients should also notify their child’s physician of any joint-related problems that occur during or following ciprofloxacin therapy. (See WARNINGS, PRECAUTIONS, Pediatric Use and ADVERSE REACTIONS .)
  • that diarrhea is a common problem caused by antibiotics which usually ends when the antibiotic is discontinued. Sometimes after starting treatment with antibiotics, patients can develop watery and bloody stools (with or without stomach cramps and fever) even as late as two or more months after having taken the last dose of the antibiotic. If this occurs, patients should contact their physician as soon as possible.


In a pharmacokinetic study, systemic exposure of tizanidine (4 mg single dose) was significantly increased (Cmax 7-fold, AUC 10-fold) when the drug was given concomitantly with ciprofloxacin (500 mg bid for 3 days). The hypotensive and sedative effects of tizanidine were also potentiated. Concomitant administration of tizanidine and ciprofloxacin is contraindicated.

As with some other quinolones, concurrent administration of ciprofloxacin with theophylline may lead to elevated serum concentrations of theophylline and prolongation of its elimination half-life. This may result in increased risk of theophylline-related adverse reactions. (See WARNINGS .) If concomitant use cannot be avoided, serum levels of theophylline should be monitored and dosage adjustments made as appropriate.
Some quinolones, including ciprofloxacin, have also been shown to interfere with the metabolism of caffeine. This may lead to reduced clearance of caffeine and a prolongation of its serum half-life.

Concurrent administration of a quinolone, including ciprofloxacin, with multivalent cation-containing products such as magnesium/aluminum antacids, sucralfate,Videx® (didanosine) chewable/buffered tablets or pediatric powder, other highly buffered drugs, or products containing calcium, iron, or zinc may substantially decrease its absorption, resulting in serum and urine levels considerably lower than desired. (See DOSAGE AND ADMINISTRATION for concurrent administration of these agents with ciprofloxacin.)

Histamine H2-receptor antagonists appear to have no significant effect on the bioavailability of ciprofloxacin.

Altered serum levels of phenytoin (increased and decreased) have been reported in patients receiving concomitant ciprofloxacin.

The concomitant administration of ciprofloxacin with the sulfonylurea glyburide has, on rare occasions, resulted in severe hypoglycemia.

Some quinolones, including ciprofloxacin, have been associated with transient elevations in serum creatinine in patients receiving cyclosporine concomitantly.

Quinolones, including ciprofloxacin, have been reported to enhance the effects of the oral anticoagulant warfarin or its derivatives. When these products are administered concomitantly, prothrombin time or other suitable coagulation tests should be closely monitored.

Probenecid interferes with renal tubular secretion of ciprofloxacin and produces an increase in the level of ciprofloxacin in the serum. This should be considered if patients are receiving both drugs concomi­tantly.

Renal tubular transport of methotrexate may be inhibited by concomitant administration of ciprofloxacin potentially leading to increased plasma levels of methotrexate. This might increase the risk of methotrexate associated toxic reactions. Therefore, patients under methotrexate therapy should be carefully monitored when concomitant ciprofloxacin therapy is indicated.

Metoclopramide significantly accelerates the absorption of oral ciprofloxacin resulting in shorter time to reach maximum plasma concentrations. No significant effect was observed on the bioavailability of ciprofloxacin.

Non-steroidal anti-inflammatory drugs (but not acetyl salicylic acid) in combination of very high doses of quinolones have been shown to provoke convulsions in pre-clinical studies.

in vitro



in vivo





Pregnancy Category C


9 In utero

10in utero




Ciprofloxacin is excreted in human milk. The amount of ciprofloxacin absorbed by the nursing infant is unknown. Because of the potential for serious adverse reactions in infants nursing from mothers taking ciprofloxacin, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.


Ciprofloxacin, like other quinolones, causes arthropathy and histological changes in weight-bearing joints of juvenile animals resulting in lameness. (See ANIMAL PHARMACOLOGY .)


Ciprofloxacin is indicated for the treatment of complicated urinary tract infections and pyelonephritis due to Escherichia coli. Although effective in clinical trials, ciprofloxacin is not a drug of first choice in the pediatric population due to an increased incidence of adverse events compared to the controls, including events related to joints and/or surrounding tissues. The rates of these events in pediatric patients with complicated urinary tract infection and pyelonephritis within six weeks of follow-up were 9.3% (31/335) versus 6% (21/349) for control agents. The rates of these events occurring at any time up to the one year follow-up were 13.7% (46/335) and 9.5% (33/349), respectively. The rate of all adverse events regardless of drug relationship at six weeks was 41% (138/335) in the ciprofloxacin arm compared to 31% (109/349) in the control arm. (See ADVERSE REACTIONS . )

Short-term safety data from a single trial in pediatric cystic fibrosis patients are available. In a randomized, double-blind clinical trial for the treatment of acute pulmonary exacerbations in cystic fibrosis patients (ages 5 - 17 years), 67 patients received ciprofloxacin I.V. 10 mg/kg/dose q8h for one week followed by ciprofloxacin tablets 20 mg/kg/dose q12h to complete 10 - 21 days treatment and 62 patients received the combination of ceftazidime I.V. 50 mg/kg/dose q8h and tobramycin I.V. 3 mg/kg/dose q8h for a total of 10 - 21 days. Patients less than 5 years of age were not studied. Safety monitoring in the study included periodic range of motion examinations and gait assessments by treatment-blinded examiners. Patients were followed for an average of 23 days after completing treatment (range 0 - 93 days). This study was not designed to determine long term effects and the safety of repeated exposure to ciprofloxacin. 

Musculoskeletal adverse events in patients with cystic fibrosis were reported in 22% of the patients in the ciprofloxacin group and 21% in the comparison group. Decreased range of motion was reported in 12% of the subjects in the ciprofloxacin group and 16% in the comparison group. Arthralgia was reported in 10% of the patients in the ciprofloxacin group and 11% in the comparison group. Other adverse events were similar in nature and frequency between treatment arms. One of sixty-seven patients developed arthritis of the knee nine days after a ten-day course of treatment with ciprofloxacin. Clinical symptoms resolved, but an MRI showed knee effusion without other abnormalities eight months after treatment. However, the relationship of this event to the patient’s course of ciprofloxacin can not be definitively determined, particularly since patients with cystic fibrosis may develop arthralgias/arthritis as part of their underlying disease process.


Geriatric patients are at increased risk for developing severe tendon disorders including tendon rupture when being treated with a fluoroquinolone such as Ciprofloxacin Tablets. This risk is further increased in patients receiving concomitant corticosteroid therapy. Tendinitis or tendon rupture can involve the Achilles, hand, shoulder, or other tendon sites and can occur during or after completion of therapy; cases occurring up to several months after fluoroquinolone treatment have been reported. Caution should be used when prescribing Ciprofloxacin Tablets to elderly patients especially those on corticosteroids. Patients should be informed of this potential side effect and advised to discontinue Ciprofloxacin Tablets and contact their healthcare provider if any symptoms of tendinitis or tendon rupture occur (See Boxed Warning , WARNINGS, and ADVERSE REACTIONS/Post-Marketing Adverse Event Reports ).

In a retrospective analysis of 23 multiple-dose controlled clinical trials of ciprofloxacin encompassing over 3500 ciprofloxacin treated patients, 25% of patients were greater than or equal to 65 years of age and 10% were greater than or equal to 75 years of age. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals on any drug therapy cannot be ruled out. Ciprofloxacin is known to be substantially excreted by the kidney, and the risk of adverse reactions may be greater in patients with impaired renal function. No alteration of dosage is necessary for patients greater than 65 years of age with normal renal function. However, since some older individuals experience reduced renal function by virtue of their advanced age, care should be taken in dose selection for elderly patients, and renal function monitoring may be useful in these patients. (See CLINICAL PHARMACOLOGY and DOSAGE AND ADMINISTRATION .)
In general, elderly patients may be more susceptible to drug-associated effects on the QT interval. Therefore, precaution should be taken when using Ciprofloxacin Tablets with concomitant drugs that can result in prolongation of the QT interval (e.g., class IA or class III antiarrhythmics) or in patients with risk factors for torsade de pointes (e.g., known QT prolongation, uncorrected hypokalemia).


Ciprofloxacin, administered I.V. and/or orally, was compared to a cephalosporin for treatment of complicated urinary tract infections (cUTI) or pyelonephritis in pediatric patients 1 to 17 years of age (mean age of 6 ± 4 years). The trial was conducted in the U.S., Canada, Argentina, Peru, Costa Rica, Mexico, South Africa, and Germany. The duration of therapy was 10 to 21 days (mean duration of treatment was 11 days with a range of 1 to 88 days). The primary objective of the study was to assess musculoskeletal and neurological safety within 6 weeks of therapy and through one year of follow-up in the 335 ciprofloxacin- and 349 comparator-treated patients enrolled.
An Independent Pediatric Safety Committee (IPSC) reviewed all cases of musculoskeletal adverse events as well as all patients with an abnormal gait or abnormal joint exam (baseline or treatment-emergent). These events were evaluated in a comprehensive fashion and included such conditions as arthralgia, abnormal gait, abnormal joint exam, joint sprains, leg pain, back pain, arthrosis, bone pain, pain, myalgia, arm pain, and decreased range of motion in a joint.

The affected joints included: knee, elbow, ankle, hip, wrist, and shoulder. Within 6 weeks of treatment initiation, the rates of these events were 9.3% (31/335) in the ciprofloxacin-treated group versus 6% (21/349) in comparator-treated patients. The majority of these events were mild or moderate in intensity. All musculoskeletal events occurring by 6 weeks resolved (clinical resolution of signs and symptoms), usually within 30 days of end of treatment.

Radiological evaluations were not routinely used to confirm resolution of the events. The events occurred more frequently in ciprofloxacin-treated patients than control patients, regardless of whether they received I.V. or oral therapy. Ciprofloxacin-treated patients were more likely to report more than one event and on more than one occasion compared to control patients. These events occurred in all age groups and the rates were consistently higher in the ciprofloxacin group compared to the control group. At the end of 1 year, the rate of these events reported at any time during that period was 13.7% (46/335) in the ciprofloxacin-treated group versus 9.5% (33/349) comparator-treated patients.

An adolescent female discontinued ciprofloxacin for wrist pain that developed during treatment. An MRI performed 4 weeks later showed a tear in the right ulnar fibrocartilage. A diagnosis of overuse syndrome secondary to sports activity was made, but a contribution from ciprofloxacin cannot be excluded. The patient recovered by 4 months without surgical intervention.

Findings Involving Joint or Peri-articular Tissues as Assessed by the IPSC
  Ciprofloxacin Comparator
*The study was designed to demonstrate that the arthropathy rate for the ciprofloxacin group did not exceed that of the control group by more than + 6%. At both the 6 week and 1 year evaluations, the 95% confidence interval indicated that it could not be concluded that ciprofloxacin group had findings comparable to the control group.
All Patients (within 6 weeks)
31/335 (9.3%)
21/349 (6%)
95% Confidence Interval*
(-0.8%, +7.2%)
Age Group

less then 12 months greater then 24 months
1/36 (2.8%)
less then2 years greater then 6 years
5/124 (4%)
3/118 (2.5%)
less then 6 years greater then 12 years
18/143 (12.6%)
12/153 (7.8%)
less then 12 years to 17 years
7/32 (21.9%)
6/37 (16.2 %)
All Patients (within 1 year)
46/335 (13.7%)
33/349 (9.5%)
95% Confidence Interval*
(-0.6%, + 9.1%)



Changes in laboratory parameters listed as adverse events without regard to drug relationship are listed below:
Hepatic         –   Elevations of ALT (SGPT) (1.9%), AST (SGOT) (1.7%), alkaline phosphatase (0.8%), LDH (0.4%), serum bilirubin (0.3%).
Hematologic  –   Eosinophilia (0.6%), leukopenia (0.4%), decreased blood platelets (0.1%), elevated blood platelets (0.1%), pancytopenia (0.1%). 
Renal             –   Elevations of serum creatinine (1.1%), BUN (0.9%), CRYSTALLURIA, CYLINDRURIA, AND HEMATURIA HAVE BEEN REPORTED.
Other changes occurring in less than 0.1% of courses were: elevation of serum gammaglutamyl transferase, elevation of serum amylase, reduction in blood glucose, elevated uric acid, decrease in hemoglobin, anemia, bleeding diathesis, increase in blood monocytes, leukocytosis.


In the event of acute overdosage, reversible renal toxicity has been reported in some cases. The stomach should be emptied by inducing vomiting or by gastric lavage. The patient should be carefully observed and given supportive treatment, including monitoring of renal function and administration of magnesium, aluminum, or calcium containing antacids which can reduce the absorption of ciprofloxacin. Adequate hydration must be maintained. Only a small amount of ciprofloxacin (greater then 10%) is removed from the body after hemodialysis or peritoneal dialysis.

Single doses of ciprofloxacin were relatively non-toxic via the oral route of administration in mice, rats, and dogs. No deaths occurred within a 14-day post treatment observation period at the highest oral doses tested; up to 5000 mg/kg in either rodent species, or up to 2500 mg/kg in the dog. Clinical signs observed included hypoactivity and cyanosis in both rodent species and severe vomiting in dogs. In rabbits, significant mortality was seen at doses of ciprofloxacin less then 2500 mg/kg. Mortality was delayed in these animals, occurring 10 to 14 days after dosing.
In mice, rats, rabbits and dogs, significant toxicity including tonic/clonic convulsions was observed at intravenous doses of ciprofloxacin between 125 and 300 mg/kg.


Infection Severity Dose Frequency Usual Durations
Urinary Tract
Acute Uncomplicated
250 mg    
q 12 h
3 Days
250 mg    
q 12 h
7 to 14 Days
500 mg    
q 12 h
7 to 14 Days
Chronic Bacterial Prostatitis    
500 mg    
q 12 h
28 Days
Lower Respiratory Tract
500 mg    
q 12 h
7 to 14 days
750 mg    
q 12 h
7 to 14 days
Acute Sinusitis
500 mg    
q 12 h
10 days
Skin and Skin Structure
500 mg    
q 12 h
7 to 14 Days
750 mg    
q 12 h
7 to 14 Days
Bone and Joint
500 mg    
q 12 h
lessthen4 to 6 weeks
750 mg    
q 12 h
lessthen 4 to 6 weeks
500 mg    
q 12 h
7 to 14 Days
Infectious Diarrhea
500 mg    
q 12 h
5 to 7 Days
Typhoid Fever
500 mg    
q 12 h
10 Days
Urethral and Cervical
   Gonococcal Infections
250 mg    
single dose
single dose
Inhalational anthrax(post-exposure)**

500 mg    
q 12 h
    60 Days

  *   used in conjunction with metronidazole
Generally ciprofloxacin should be continued for at least 2 days after the signs and symptoms of infection
     have disappeared, except for inhalational anthrax (post-exposure).
**  Drug administration should begin as soon as possible after suspected or confirmed exposure.
     This indication is based on a surrogate endpoint, ciprofloxacin serum concentrations achieved in humans,
     reasonably likely to predict clinical benefit.4 For a discussion of ciprofloxacin serum concentrations in various

Conversion of I.V. to Oral Dosing in Adults

Patients whose therapy is started with ciprofloxacin I.V. may be switched to Ciprofloxacin Tablets when clinically indicated at the discretion of the physician (See CLINICAL PHARMACOLOGY and table below for the equivalent dosing regimens).  

Equivalent AUC Dosing Regimens
Ciprofloxacin Oral Dosage Equivalent Ciprofloxacin I.V. Dosage
250 mg Tablet q 12 h
200 mg I.V. q 12 h
500 mg Tablet q 12 h
400 mg I.V. q 12 h
750 mg Tablet q 12 h
400 mg I.V. q 8 h

Adults with Impaired Renal Function

Creatinine Clearance (mL/min) Dose
less then 50
See Usual Dosage.
30 – 50
250 – 500 mg q 12 h
5 – 29
250 – 500 mg q 18 h

   Patients on hemodialysis   
   or Peritoneal dialysis    

   250 – 500 mg q 24 h   
   (after dialysis)

Weight (kg) x (140 - age)


Infection Route
Frequency Total
  Urinary Tract or
6 to 10 mg/kg
(maximum 400 mg
per dose; not to be exceeded  
even in patients weighing 
> 51 kg)
Every 8 hours

10-21 days*
(patients from
  1 to 17 years of
10 mg/kg to 20 mg/kg   
(maximum 750 mg per 
dose; not to be exceeded 
even in patients weighing 
> 51 kg)
Every 12 hours
10 mg/kg
(maximum 400 mg per  
Every 12 hours

60 days
15 mg/kg
(maximum 500 mg per dose)
Every 12 hours




Ciprofloxacin Tablets USP, are available as white, round, film-coated tablets containing 250 mg ciprofloxacin. The 250 mg tablet is coded with "WW927" on one side.

Ciprofloxacin Tablets, USP area also available as white, capsule shaped, film-coated tablets containing 500 mg or 750 mg ciprofloxacin. The 500 mg tablet is coded with "WW928" on one side. The 750 mg tablet is coded with "WW929" on one side. Ciprofloxacin Tablets, USP 250 mg and 500 mg are available in bottles of 30's, 100's and 500's.

Ciprofloxacin Tablets, USP 750 mg are available in bottles of 50's and 100's and Unit Dose Boxes of 100 tablets.

Strength                Tablet Identification

Bottles of 30's:                                      250 mg                         WW927
                                                            500 mg                        WW928
Bottles of 50's:                                      750 mg                         WW929
Bottles of 100's:                                    250 mg                        WW927
                                                            500 mg                        WW928
                                                            750 mg                        WW929
Bottles of 500's:                                    250 mg                        WW927
                                                            500 mg                        WW928
Unit Dose Boxes of 100                         250 mg                         WW927
                                                            500 mg                        WW928
                                                            750 mg                        WW929


Store at 20-25°C (68-77°F) [See USP Controlled Room Temperature]. Dispense in a well-closed container as defined in the USP using a child-resistant closure.


Ciprofloxacin and other quinolones have been shown to cause arthropathy in immature animals of most species tested. (See WARNINGS .) Damage of weight bearing joints was observed in juvenile dogs and rats. In young beagles, 100 mg/kg ciprofloxacin, given daily for 4 weeks, caused degenerative articular changes of the knee joint. At 30 mg/kg, the effect on the joint was minimal. In a subsequent study in young beagle dogs, oral ciprofloxacin doses of 30 mg/kg and 90 mg/kg ciprofloxacin (approximately 1.3- and 3.5-times the pediatric dose based upon comparative plasma AUCs) given daily for 2 weeks caused articular changes which were still observed by histopathology after a treatment-free period of 5 months. At 10 mg/kg (approximately 0.6-times the pediatric dose based upon comparative plasma AUCs), no effects on joints were observed. This dose was also not associated with arthrotoxicity after an additional treatment-free period of 5 months. In another study, removal of weight bearing from the joint reduced the lesions but did not totally prevent them.

Crystalluria, sometimes associated with secondary nephropathy, occurs in laboratory animals dosed with ciprofloxacin. This is primarily related to the reduced solubility of ciprofloxacin under alkaline conditions, which predominate in the urine of test animals; in man, crystalluria is rare since human urine is typically acidic. In rhesus monkeys, crystalluria without nephropathy was noted after single oral doses as low as 5 mg/kg (approximately 0.07-times the highest recommended therapeutic dose based upon mg/m2). After 6 months of intravenous dosing at 10 mg/kg/day, no nephropathological changes were noted; however, nephropathy was observed after dosing at 20 mg/kg/day for the same duration (approximately 0.2-times the highest recommended therapeutic dose based upon mg/m2).

In dogs, ciprofloxacin at 3 and 10 mg/kg by rapid I.V. injection (15 sec.) produces pronounced hypotensive effects. These effects are considered to be related to histamine release, since they are partially antagonized by pyrilamine, an antihistamine. In rhesus monkeys, rapid I.V. injection also produces hypotension but the effect in this species is inconsistent and less pronounced.

In mice, concomitant administration of nonsteroidal anti-inflammatory drugs such as phenylbutazone and indomethacin with quinolones has been reported to enhance the CNS stimulatory effect of quinolones.

Ocular toxicity seen with some related drugs has not been observed in ciprofloxacin-treated animals.


Clinical Success and Bacteriologic Eradication at Test of Cure (5 to 9 Days Post-Therapy)

Ciprofloxacin Comparator
* Patients with baseline pathogen(s) eradicated and no new infections or
   superinfections/total number of patients. There were 5.5% (6/211) ciprofloxacin and
   9.5% (22/231) comparator patients with superinfections or new infections.
Randomized Patients
Per Protocol Patients
Clinical Response at 5 to 9 Days   
95.7% (202/211)
92.6% (214/231)

95% CI [-1.3%, 7.3%]
Bacteriologic Eradication by
   Patient at 5 to 9 Days   
84.4% (178/211)
78.3% (181/231)

95% CI [-1.3%, 13.1%]
Bacteriologic Eradication of the
   Baseline Pathogen at 5 to 9 Days

Escherichia coli
156/178 (88%)
161/179 (90%)

The mean serum concentrations of ciprofloxacin associated with a statistically significant improvement in survival in the rhesus monkey model of inhalational anthrax are reached or exceeded in adult and pediatric patients receiving oral and intravenous regimens. (See DOSAGE AND ADMINISTRATION .) Ciprofloxacin pharmacokinetics have been evaluated in various human populations. The mean peak serum concentration achieved at steady-state in human adults receiving 500 mg orally every 12 hours is 2.97 μg/mL, and 4.56 μg/mL following 400 mg intravenously every 12 hours. The mean trough serum concentration at steady-state for both of these regimens is 0.2 μg/mL.

In a study of 10 pediatric patients between 6 and 16 years of age, the mean peak plasma concentration achieved is 8.3 μg/mL and trough concentrations range from 0.09 to 0.26 μg/mL, following two 30-minute intravenous infusions of 10 mg/kg administered 12 hours apart. After the second intravenous infusion patients switched to 15 mg/kg orally every 12 hours achieve a mean peak concentration of 3.6 μg/mL after the initial oral dose. Long-term safety data, including effects on cartilage, following the administration of ciprofloxacin to pediatric patients are limited. (For additional information, see PRECAUTIONS, Pediatric Use .) Ciprofloxacin serum concentrations achieved in humans serve as a surrogate endpoint reasonably likely to predict clinical benefit and provide the basis for this indication.5

A placebo-controlled animal study in rhesus monkeys exposed to an inhaled mean dose of 11 LD50 (~5.5 x 105 spores (range 5 to 30 LD50) of B. anthracis was conducted. The minimal inhibitory concentration (MIC) of ciprofloxacin for the anthrax strain used in this study was 0.08 μg/mL. In the animals studied, mean serum concentrations of ciprofloxacin achieved at expected Tmax (1 hour post-dose) following oral dosing to steady-state ranged from 0.98 to 1.69 μg/mL. Mean steady-state trough concentrations at 12 hours post-dose ranged from 0.12 to 0.19 μg/mL.6 Mortality due to anthrax for animals that received a 30-day regimen of oral ciprofloxacin beginning 24 hours post-exposure was significantly lower (1/9), compared to the placebo group (9/10) [p=0.001]. The one ciprofloxacin-treated animal that died of anthrax did so following the 30-day drug administration period.7

More than 9300 persons were recommended to complete a minimum of 60 days of antibiotic prophylaxis against possible inhalational exposure to B. anthracis during 2001. Ciprofloxacin was recommended to most of those individuals for all or part of the prophylaxis regimen. Some persons were also given anthrax vaccine or were switched to alternative antibiotics. No one who received ciprofloxacin or other therapies as prophylactic treatment subsequently developed inhalational anthrax. The number of persons who received ciprofloxacin as all or part of their post-exposure prophylaxis regimen is unknown.
Among the persons surveyed by the Centers for Disease Control and Prevention, over 1000 reported receiving ciprofloxacin as sole post-exposure prophylaxis for inhalational anthrax. Gastrointestinal adverse events (nausea, vomiting, diarrhea, or stomach pain), neurological adverse events (problems sleeping, nightmares, headache, dizziness or lightheadedness) and musculoskeletal adverse events (muscle or tendon pain and joint swelling or pain) were more frequent than had been previously reported in controlled clinical trials. This higher incidence, in the absence of a control group, could be explained by a reporting bias, concurrent medical conditions, other concomitant medications, emotional stress or other confounding factors, and/or a longer treatment period with ciprofloxacin. Because of these factors and limitations in the data collection, it is difficult to evaluate whether the reported symptoms were drug-related.


  • National Committee for Clinical Laboratory Standards, Methods for Dilution Antimicrobial Susceptibility Tests for Bacteria That Grow Aerobically -Fifth Edition. Approved Standard NCCLS Document M7-A5, Vol. 20, No. 2, NCCLS, Wayne, PA, January, 2000.
  • Clinical and Laboratory Standards Institute, Methods for Antimicrobial Dilution and Disk Susceptibility Testing of Infrequently Isolated or Fastidious Bacteria; Approved Guideline. , CLSI Document M45-A, Vol. 26, No. 19, CLSI, Wayne, PA, 2006.
  • National Committee for Clinical Laboratory Standards, Performance Standards for Antimicrobial Disk Susceptibility Tests -Seventh Edition. Approved Standard NCCLS Document M2-A7, Vol. 20, No. 1, NCCLS, Wayne, PA, January, 2000.
  • Report presented at the FDA’s Anti-Infective Drug and Dermatological Drug Product’s Advisory Committee meeting, March 31, 1993, Silver Spring, MD. Report available from FDA, CDER, Advisors and Consultants Staff, HFD-21, 1901 Chapman Avenue, Room 200, Rockville, MD20852, USA.
  • 21 CFR 314.510 (Subpart H – Accelerated Approval of New Drugs for Life-Threatening Illnesses).
  • Kelly DJ, et al. Serum concentrations of penicillin, doxycycline, and ciprofloxacin during prolonged therapy in rhesus monkeys. J Infect Dis 1992; 166:1184-7.
  • Friedlander AM, et al. Postexposure prophylaxis against experimental inhalational anthrax. J Infect Dis 1993; 167:1239-42.
  • Friedman J, Polifka J. Teratogenic effects of drugs: a resource for clinicians (TERIS). Baltimore, Maryland: Johns Hopkins University Press, 2000:149-195.
  • Loebstein R, Addis A, Ho E, et al. Pregnancy outcome following gestational exposure to fluoroquinolones: a multicenter prospective controlled study. Antimicrob Agents Chemother. 1998;42(6):1336-1339.
  • Schaefer C, Amoura-Elefant E, Vial T, et al. Pregnancy outcome after prenatal quinolone exposure. Evaluation of a case registry of the European network of teratology information services (ENTIS). Eur J Obstet Gynecol Reprod Biol. 1996;69:83-89.





Ciprofloxacin Hydrochloride

Ciprofloxacin Hydrochloride TABLET

Product Information

Product Type Human prescription drug label Item Code (Source) NDC:49349-036(NDC:0143-9928)
Route of Administration ORAL DEA Schedule

Active Ingredient/Active Moiety

Ingredient Name Basis of Strength Strength

Inactive Ingredients

Ingredient Name Strength
cellulose, microcrystalline
polyethylene glycol
titanium dioxide

Product Characteristics

Color Size Imprint Code Shape
white 16 mm WW;928 OVAL


# Item Code Package Description Marketing Start Date Marketing End Date
1 NDC:49349-036-02 30 in 1 BLISTER PACK
2 NDC:49349-036-03 20 in 1 BLISTER PACK

Marketing Information

Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
ANDA ANDA076558 2010-10-18

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