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Didanosine

Aurobindo Pharma Limited

HIGHLIGHTS OF PRESCRIBING INFORMATION These highlights do not include all the information needed to use didanosine safely and effectively. See full prescribing information for didanosine tablets for oral suspension, USP. Didanosine Tablets for Oral Suspension, USPInitial U.S. Approval: 1991 RECENT MAJOR CHANGES(5.7)BOXED WARNINGWARNING: PANCREATITIS, LACTIC ACIDOSIS and HEPATOMEGALY with STEATOSIS See full prescribing information for complete boxed warning.  Fatal and nonfatal pancreatitis. Didanosine should be suspended in patients with suspected pancreatitis and discontinued in patients with confirmed pancreatitis. (5.1) Lactic acidosis and severe hepatomegaly with steatosis, including fatal cases. Fatal lactic acidosis has been reported in pregnant women who received the combination of didanosine and stavudine. (5.2) INDICATIONS AND USAGE(1)DOSAGE AND ADMINISTRATION Adult patients: Administered on an empty stomach at least 30 minutes before or 2 hours after eating. Dosing is based on body weight. (2.1)   at least 60 kg less than 60 kg * The 200 mg strength tablet should only be used as a component of a once-daily regimen.    Preferred dosing*    200 mg twice daily    125 mg twice daily    Dosing for patients whose management requires once-daily frequency    400 mg once daily    250 mg once daily Pediatric patients (2 weeks old to 18 years old): Administered on an empty stomach at least 30 minutes before or 2 hours after eating. − Between 2 weeks and 8 months old, dosing is 100 mg/m2 twice daily.− For those greater than 8 months old, dosing is 120 mg/m2 twice daily but not to exceed the adult dosing recommendation. (2.1) Renal impairment: Dose reduction is recommended. (2.2) Coadministration with tenofovir: Dose reduction is recommended. Patients should be monitored closely for didanosine-associated adverse reactions. (2.3, 7.1) DOSAGE FORMS AND STRENGTHS Tablets for Oral Suspension: 100 mg, 150 mg, and 200 mg (3) CONTRAINDICATIONS4.14.2)WARNINGS AND PRECAUTIONS Pancreatitis: Suspension or discontinuation of didanosine may be necessary. (5.1) Lactic acidosis and severe hepatomegaly with steatosis: Suspend didanosine in patients who develop clinical symptoms or signs with or without laboratory findings. (5.2) Hepatic toxicity: Interruption or discontinuation of didanosine must be considered upon worsening of liver disease. (5.3) Non-cirrhotic portal hypertension: Discontinue didanosine in patients with evidence of non-cirrhotic portal hypertension. (5.4) Patients may develop peripheral neuropathy (5.5), retinal changes and optic neuritis (5.6), immune reconstitution syndrome (5.7), and redistribution/accumulation of body fat. (5.8) Side Effects In adults, the most common adverse reactions (greater than 10%, all grades) are diarrhea, peripheral neurologic symptoms/neuropathy, abdominal pain, nausea, headache, rash, and vomiting. (6.1) Adverse reactions in pediatric patients were consistent with those in adults. (6.1)   To report SUSPECTED ADVERSE REACTIONS, contact Aurobindo Pharma USA, Inc. at 1-866-850-2876 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatchDRUG INTERACTIONS(47,12.3)USE IN SPECIFIC POPULATIONS(5.28.1)


FULL PRESCRIBING INFORMATION: CONTENTS*




FULL PRESCRIBING INFORMATION

WARNING: PANCREATITIS, LACTIC ACIDOSIS and HEPATOMEGALY with STEATOSIS


Fatal and nonfatal pancreatitis has occurred during therapy with didanosine used alone or in combination regimens in both treatment-naive and treatment-experienced patients, regardless of degree of immunosuppression. Didanosine should be suspended in patients with suspected pancreatitis and discontinued in patients with confirmed pancreatitis [see Warnings and Precautions (5.1)].

Lactic acidosis and severe hepatomegaly with steatosis, including fatal cases, have been reported with the use of nucleoside analogues alone or in combination, including didanosine and other antiretrovirals. Fatal lactic acidosis has been reported in pregnant women who received the combination of didanosine and stavudine with other antiretroviral agents. The combination of didanosine and stavudine should be used with caution during pregnancy and is recommended only if the potential benefit clearly outweighs the potential risk [see Warnings and Precautions (5.2)].

1 INDICATIONS AND USAGE


[see Clinical Studies (14)]

2 DOSAGE AND ADMINISTRATION


2.1 Recommended Dosage (Adult and Pediatric Patients)


[see Clinical Studies (14)]
Table 1: Recommended Dosage (Adult)
  at least 60 kg less than 60 kg
* The 200 mg strength tablet should only be used as a component of a once-daily regimen.
   Preferred dosing*
 200 mg twice daily
 125 mg twice daily
   Dosing for patients whose management requires once-daily frequency
 400 mg once daily
 250 mg once daily
Pediatric Patients (2 weeks old to 18 years old):22

2.2 Renal Impairment


Adult Patients

Table 2: Recommended Dosage in Patients with Renal Impairmenta
Creatinine Clearance (mL/min) Recommended Didanosine Tablets for Oral Suspension
Dose by Patient Weight
at least 60 kg less than 60 kg
a Two didanosine tablets for oral suspension must be taken with each dose; different strengths of tablets may be combined to yield the recommended dose.
b 400 mg once daily (at least 60 kg) or 250 mg once daily (less than 60 kg) for patients whose management requires once-daily frequency of administration.
at least 60
 200 mg twice dailyb
125 mg twice dailyb
30-59
 200 mg once daily or
100 mg twice daily
 150 mg once daily or
75 mg twice daily
10-29
 150 mg once daily
 100 mg once daily
less than 10
 100 mg once daily
 75 mg once daily

Pediatric Patients



Patients Requiring Continuous Ambulatory Peritoneal Dialysis (CAPD) or Hemodialysis

2.3 Dosage Adjustment


Concomitant Therapy with Tenofovir Disoproxil Fumarate

[See Drug Interactions (7) and Clinical Pharmacology (12.3)]

Hepatic Impairment

[see Warnings and Precautions (5.3) and Clinical Pharmacology (12.3)]

Method of Preparation

Didanosine Tablets for Oral Suspension

Adult Dosing:

3 DOSAGE FORMS AND STRENGTHS






4 CONTRAINDICATIONS


4.1 Allopurinol


[see Clinical Pharmacology (12.3)]

4.2 Ribavirin


5 WARNINGS AND PRECAUTIONS

5.1 Pancreatitis


Fatal and nonfatal pancreatitis has occurred during therapy with didanosine used alone or in combination regimens in both treatment-naive and treatment-experienced patients, regardless of degree of immunosuppression. Didanosine should be suspended in patients with signs or symptoms of pancreatitis and discontinued in patients with confirmed pancreatitis. Patients treated with didanosine in combination with stavudine may be at increased risk for pancreatitis.

[See Adverse Reactions (6).]

5.2 Lactic Acidosis/Severe Hepatomegaly with Steatosis


Lactic acidosis and severe hepatomegaly with steatosis, including fatal cases, have been reported with the use of nucleoside analogues alone or in combination, including didanosine and other antiretrovirals.[see Use in Specific Populations (8.1)]

5.3 Hepatic Toxicity




[See Adverse Reactions (6).]

5.4 Non-cirrhotic Portal Hypertension




5.5 Peripheral Neuropathy


[See Adverse Reactions (6).]

5.6 Retinal Changes and Optic Neuritis


[see Adverse Reactions (6)]

5.7 Immune Reconstitution Syndrome


Mycobacterium aviumPneumocystis jiroveci

5.8 Fat Redistribution


5.9 Patients with Phenylketonuria





Table 3
All Strengths
   Phenylalanine per 2 tablet dose
73 mg
   Phenylalanine per tablet
36.5 mg

6 ADVERSE REACTIONS


6.1 Clinical Trials Experience




Adults

Table 4: Selected Clinical Adverse Reactions from Monotherapy Studies
Adverse Reactions Percent of Patients*
ACTG 116A ACTG 116B/117
didanosine
n=197		 zidovudine
n=212		 didanosine
n=298		 zidovudine
n=304
* The incidences reported included all severity grades and all reactions regardless of causality.
   Diarrhea
 19
 15
 28
 21
   Peripheral Neurologic Symptoms/Neuropathy
 17
 14
 20
 12
   Abdominal Pain
 13
 8
 7
 8
   Rash/Pruritus
 7
 8
 9
 5
   Pancreatitis
 7
 3
 6
 2

Table 5: Selected Clinical Adverse Reactions from Combination Studies
Percent of Patientsa,c
AI454-148b START 2b
didanosine + stavudine + nelfinavir
n=482		 zidovudine + lamivudine + nelfinavir
n=248		 didanosine + stavudine + indinavir
n=102		 zidovudine + lamivudine + indinavir
n=103
a Percentages based on treated subjects.
b Median duration of treatment 48 weeks.
c The incidences reported included all severity grades and all reactions regardless of causality.
* This event was not observed in this study arm.
   Diarrhea
 70
 60
 45
 39
   Nausea
 28
 40
 53
 67
   Peripheral Neurologic Symptoms/Neuropathy
 26
 6
 21
 10
   Headache
21
 30
 46
 37
   Rash
13
 16
 30
 18
   Vomiting
12
 14
 30
 35
   Pancreatitis (see below)
1
 *
 less than 1
 *

[see Warnings and Precautions (5)]





Table 6: Selected Laboratory Abnormalities from Monotherapy Studies
Parameter Percent of Patients
ACTG 116A ACTG 116B/117
didanosine
n=197		 zidovudine
n=212		 didanosine
n=298		 zidovudine
n=304
ULN = upper limit of normal.
   SGOT (AST) (greater than 5 x ULN)
 9
 4
 7
 6
   SGPT (ALT) (greater than 5 x ULN)
 9
 6
 6
 6
   Alkaline phosphatase (greater than 5 x ULN)
 4
 1
 1
 1
   Amylase (at least 1.4 x ULN)
 17
 12
 15
 5
   Uric acid (greater than 12 mg/dL)
 3
 1
 2
 1

Table 7: Selected Laboratory Abnormalities from Combination Studies (Grades 3 to 4)
Parameter Percent of Patientsa
AI454-148b START 2b
didanosine + stavudine + nelfinavir
n=482		 zidovudine + lamivudine + nelfinavir
n=248		 didanosine + stavudine + indinavir
n=102		 zidovudine + lamivudine + indinavir
n=103
ULN = upper limit of normal.
NC = Not Collected.
a Percentages based on treated subjects.
b Median duration of treatment 48 weeks.
   Bilirubin (greater than 2.6 x ULN)
 less than 1
 less than 1
 16
 8
   SGOT (AST) (greater than 5 x ULN)
 3
 2
 7
 7
   SGPT (ALT) (greater than 5 x ULN)
 3
 3
 8
 5
   GGT (greater than 5 x ULN)
 NC
 NC
 5
 2
   Lipase (greater than 2 x ULN)
 7
 2
 5
 5
   Amylase (greater than 2 x ULN)
 NC
 NC
 8
 2

Table 8: Selected Laboratory Abnormalities from Combination Studies (All Grades)
Parameter Percent of Patientsa
AI454-148b START 2b
didanosine + stavudine + nelfinavir
n=482		 zidovudine + lamivudine + nelfinavir
n=248		 didanosine + stavudine + indinavir
n=102		 zidovudine + lamivudine + indinavir
n=103
NC = Not Collected.
a Percentages based on treated subjects.
b Median duration of treatment 48 weeks.
   Bilirubin
 7
 3
 68
 55
   SGOT (AST)
 42
 23
 53
 20
   SGPT (ALT)
 37
 24
 50
 18
   GGT
 NC
 NC
 28
 12
   Lipase
 17
 11
 26
 19
   Amylase
 NC
 NC
 31
 17

Pediatric Patients



22 2[see Clinical Studies (14)]

6.2 Postmarketing Experience




Blood and Lymphatic System Disorders

Body as a Whole [see Warnings and Precautions (5.8)]

Digestive Disorders

Exocrine Gland Disorders [see Boxed Warning, Warnings and Precautions (5.1)]

Hepatobiliary Disorders [see Boxed Warning, Warnings and Precautions (5.2)][see Warnings and Precautions (5.4)]

Metabolic Disorders

Musculoskeletal Disorders

Ophthalmologic Disorders [see Warnings and Precautions (5.6)]

Use with Stavudine- and Hydroxyurea-Based Regimens

[see Warnings and Precautions (5)]

7 DRUG INTERACTIONS

7.1 Established Drug Interactions


[see Contraindications (4.1 and 4.2), Clinical Pharmacology (12.3)]
Table 9: Established Drug Interactions with Didanosine
Drug Effect Clinical Comment
↑ Indicates increase.
↓ Indicates decrease.
a The dosing recommendation for coadministration of didanosine delayed-release capsules and tenofovir disoproxil fumarate with respect to meal consumption differs from that of didanosine. See the complete prescribing information for didanosine delayed-release capsules.
   ciprofloxacin
   ↓ ciprofloxacin
   concentration
 Administer didanosine at least 2 hours after or 6 hours before ciprofloxacin.
   delavirdine
   ↓ delavirdine
   concentration
Administer didanosine 1 hour after delavirdine.
   ganciclovir
   ↓ didanosine
   concentration
 If there is no suitable alternative to ganciclovir, then use in combination with didanosine with caution. Monitor for didanosine-associated toxicity.
   indinavir
   ↓ indinavir
   concentration
 Administer didanosine 1 hour after indinavir.
   methadone
   ↓ didanosine
   concentration
 Do not coadminister methadone with didanosine pediatric powder due to significant decreases in didanosine concentrations. If coadministration of methadone and didanosine is necessary, the recommended formulation of didanosine is didanosine delayed-release capsules. Patients should be closely monitored for adequate clinical response when didanosine delayed-release capsules are coadministered with methadone, including monitoring for changes in HIV RNA viral load.
   nelfinavir
    ↓ No interacion
   1 hour after
   didanosine
 Administer nelfinavir 1 hour after didanosine.
   tenofovir
disoproxil 
   fumarate
    ↓ didanosine
   concentration
 A dose reduction of didanosine to the following dosage once daily is recommended.a
  • 250 mg (adults weighing at least 60 kg with creatinine clearance of at least 60 mL/min)
  • 200 mg (adults weighing less than 60 kg with creatinine clearance of at least 60 mL/min)
Didanosine and tenofovir disoproxil fumarate may be taken together in the fasted state. If tenofovir disoproxil fumarate is taken with food, didanosine should be taken on an empty stomach (at least 30 minutes before food or 2 hours after food). Patients should be monitored for didanosine­-associated toxicities and clinical response.


[Table 9 and see Clinical Pharmacology (12.3, Table 13)][see Dosage and Administration (2.3) , Warnings and Precautions (5) ]

7.2 Predicted Drug Interactions




Table 10: Predicted Drug Interactions with Didanosine
Drug or Drug Class Effect Clinical Comment
↑ Indicates increase.
↓ Indicates decrease.
a Only if other drugs are not available and if clearly indicated. If treatment with life-sustaining drugs that cause pancreatic toxicity is required, suspension of didanosine is recommended [see Warnings and Precautions (5.1)].
b [See Warnings and Precautions (5.6).]
   Drugs that may cause pancreatic toxicity
↑ risk of pancreatitis
    Use only with extreme cautiona
   Neurotoxic drugs
↑ risk of neuropathy
    Use with cautionb
   Antacids containing magnesium or aluminum
 ↑ side effects associated
with antacid components
    Use caution with didanosine tablets for oral suspension and didanosine pediatric powder for oral solution
   Azole antifungals
↓ ketoconazole or
Itraconazole
concentration
    Administer drugs such as ketoconazole or itraconazole at least 2 hours before didanosine.
   Quinolone antibiotics (see also ciprofloxacin in Table 9)
 ↓ quinolone concentration
    Consult package insert of the quinolone.
   Tetracycline antibiotics
↓ antibiotic concentration
    Consult package insert of the tetracycline.

8 USE IN SPECIFIC POPULATIONS

8.1 Pregnancy


Teratogenic Effects

Pregnancy Category B





[see Warnings and Precautions (5.2)]The combination of didanosine and stavudine should be used with caution during pregnancy and is recommended only if the potential benefit clearly outweighs the potential risk.

Antiretroviral Pregnancy Registry

8.3 Nursing Mothers


The Centers for Disease Control and Prevention recommend that HIV-infected mothers not breastfeed their infants to avoid risking postnatal transmission of HIV.mothers should be instructed not to breastfeed if they are receiving didanosine.

8.4 Pediatric Use


[see Dosage and Administration (2), Adverse Reactions (6.1), Clinical Pharmacology (12.3), and Clinical Studies (14)]

8.5 Geriatric Use


[see Warnings and Precautions (5.1)][see Dosage and Administration (2.2)]

8.6 Renal Impairment


[see Clinical Pharmacology (12.3)][see Dosage and Administration (2)]

10 OVERDOSAGE


There is no known antidote for didanosine overdosage. In phase 1 studies, in which didanosine was initially administered at doses ten times the currently recommended dose, toxicities included: pancreatitis, peripheral neuropathy, diarrhea, hyperuricemia, and hepatic dysfunction. Didanosine is not dialyzable by peritoneal dialysis, although there is some clearance by hemodialysis [see Clinical Pharmacology (12.3)].

11 DESCRIPTION





Didanosine
101243

12 CLINICAL PHARMACOLOGY

12.1 Mechanism of Action


[see Clinical Pharmacology (12.4)]

12.3 Pharmacokinetics


in vitroin vitro
Table 11: Mean ± SD Pharmacokinetic Parameters for Didanosine in Adult and Pediatric Patients
Parameter Adult
Patientsa 		   n     Pediatric Patientsb
8 months to
19 years		 n 2 weeks to
4 months		 n
CSF = cerebrospinal fluid, ND = not determined.
a Parameter units for adults were converted to the same units in pediatric patients to facilitate comparisons among populations: mean adult body weight = 70 kg and mean adult body surface area = 1.73 m2.
b In 1-day old infants (n=10), the mean ± SD apparent oral clearance was 1523 ± 1176 mL/min/m2 and half-life was 2 ± 0.7 h.
c Following IV administration.
d Following IV administration in adults and IV or oral administration in pediatric patients.
e Mean ± SE.
f Following oral administration.
g Apparent oral clearance estimate was determined as the ratio of the mean systemic clearance and the mean oral bioavailability estimate.
   Oral bioavailability (%)
 42 ± 12
 6
25 ± 20
 46
 ND
   Apparent volume of distributionc (L/m2)
 43.7 ± 8.9
 6
 28 ± 15
 49
 ND
   CSF-plasma ratiod
21 ± 0.03%e
5
 46%
(range 12 to 85%)
7
 ND
   Systemic clearancec(mL/min/m2)
 526 ± 64.7
 6
 516 ± 184
 49
 ND
   Renal clearancef (mL/min/m2)
 223 ± 85
 6
 240 ± 90
 15
 ND
   Apparent oral clearanceg (mL/min/m2)
 1252 ± 154
 6
 2064 ± 736
 48
 1353 ± 759
 41
   Elimination half-lifef (h)
 1.5 ± 0.4
 6
 0.8 ± 0.3
 60
1.2 ± 0.3
 21
   Urinary recovery of didanosinef (%)
 18 ± 8
 6
 18 ± 10
 15
 ND

Effect of Food

max[see Dosage and Administration (2)]

Special Populations

Renal Insufficiency: [See Dosage and Administration (2.2) .]
Table 12: Mean ± SD Pharmacokinetic Parameters for Didanosine Following a Single Oral Dose
Parameter Creatinine Clearance (mL/min)  
at least 90
n=12		 60-90
n=6		 30-59
n=6		 10-29
n=3		 Dialysis Patients
n=11
ND = not determined due to anuria.
CLcr = creatinine clearance.
CL/F = apparent oral clearance.
CLR = renal clearance.
   CLcr (mL/min)
112 ± 22
 68 ± 8
 46 ± 8
 13 ± 5
 ND
   CL/F (mL/min)
2164 ± 638
 1566 ± 833
 1023 ± 378
 628 ± 104
 543 ± 174
   CLR (mL/min)
458 ± 164
 247 ± 153
 100 ± 44
 20 ± 8
 less than 10
   T½ (h)
1.42 ± 0.33
 1.59 ± 0.13
 1.75 ± 0.43
 2 ± 0.3
 4.1 ± 1.2

Hepatic Impairment: maxmax[See Dosage and Administration (2.3).]

Pediatric Patients: 22[see Clinical Studies (14.2) and Use in Specific Populations (8.4)]

[see Use in Specific Populations (8.5)]



Drug Interactions

max[see Dosage and Administration (2.3 for Concomitant Therapy with Tenofovir Disoproxil Fumarate), Contraindications (4.1), and Drug Interactions (7.1 and 7.2)]
Table 13: Results of Drug Interaction Studies with Didanosine: Effects of Coadministered Drug on Didanosine Plasma AUC and Cmax Values
% Change of Didanosine Pharmacokinetic Parametersa
Drug Didanosine
Dosage		 n AUC of Didanosine (95% CI) Cmax of Didanosine
(95% CI)
↑ Indicates increase.
↓ Indicates decrease.
↔ Indicates no change, or mean increase or decrease of less than 10%.
a The 95% confidence intervals for the percent change in the pharmacokinetic parameter are displayed.
b HIV-infected patients.
c 90% CI.
d Comparisons are made to a parallel control group not receiving methadone (n=10).
eComparisons are made to historical controls (n=68, pooled from 3 studies) conducted in healthy subjects. The number of subjects evaluated for AUC and Cmax is 15 and 16, respectively.
f For results of drug interaction studies between the enteric-coated formulation of didanosine (didanosine delayed-release capsules) and methadone, see the complete prescribing information for didanosine delayed-release capsules.
g Tenofovir disoproxil fumarate.
h For results of drug interaction studies between the enteric-coated formulation of didanosine (didanosine delayed-release capsules) and tenofovir disoproxil fumarate, see the complete prescribing information for didanosine delayed-release capsules.
i Patients less than 60 kg with creatinine clearance of at least 60 mL/min.
NA = Not available.
   allopurinol,
 
   renally impaired, 300 mg/day
   200 mg single dose
 2
 ↑ 312%
 ↑ 232%
   healthy volunteer, 300 mg/day for 7 days
   400 mg single dose
 14
 ↑ 113%
 ↑ 69%
   ciprofloxacin, 750 mg every 12 hours for 3 days, 2 hours before didanosine
   200 mg every 12 hours for 3 days
 8b
↓ 16%
 ↓ 28%
   ganciclovir, 1000 mg every 8 hours, 2 hours after didanosine indinavir, 800 mg single dose,
   200 mg every 12 hours
 12
 ↑ 111%
 NA
   simultaneous
    200 mg single dose
 16
 ↔
 ↔
   1 hour before didanosine
   200 mg single dose
 16
 ↓ 17%
(-27, -7%)c
↓ 13%
(-28, 5%)c
   ketoconazole, 200 mg/day for 4 days, 2 hours before didanosine
   375 mg every 12 hours for 4 days
 12b
↔
 ↓ 12%
   methadone, chronic maintenance dosef
   200 mg single dose
 16d
↓ 57%
 ↓ 66%
   400 mg single dose
 15, 16e
↓ 29%
(-40, -16%)c
↓ 41%
(-54, -26%)c
   tenofovir,g,h 300 mg once daily, 1 hour after didanosine
   250i mg or 400 mg once daily for 7 days
 14
 ↑ 44%
(31, 59%)c
↑ 28%
(11, 48%)c
   loperamide, 4 mg every 6 hours for 1 day
   300 mg single dose
 12b
↔
 ↓ 23%
   metoclopramide, 10 mg single dose
   300 mg single dose
 12b
↔
 ↑ 13%
   ranitidine, 150 mg single dose, 2 hours before didanosine
    375 mg single dose
 12b
↑ 14%
 ↑ 13%
   rifabutin, 300 or 600 mg/day for 12 days
    167 mg or 250 mg every 12 hours for 12 days
 11
 ↑ 13%
(-1, 27%)
 ↑ 17%
(-4, 38%)
   ritonavir, 600 mg every 12 hours for 4 days
    200 mg every 12 hours for 4 days
 12
 ↓ 13%
(0, 23%)
 ↓ 16%
(5, 26%)
   stavudine, 40 mg every 12 hours for 4 days
    100 mg every 12 hours for 4 days
 10
 ↔
 ↔
   sulfamethoxazole, 1000 mg single dose
    200 mg single dose
 8b
↔
 ↔
   trimethoprim, 200 mg single dose
    200 mg single dose
 8b
↔
 ↑ 17%
(-23, 77%)
   zidovudine, 200 mg every 8 hours for 3 days
    200 mg every 12 hours for 3 days
 6b
↔
 ↔

Table 14: Results of Drug Interaction Studies with Didanosine: Effects of Didanosine on Coadministered Drug Plasma AUC and Cmax Values
% Change of
Coadministered Drug
Pharmacokinetic Parametersa
Drug Didanosine
Dosage		 n AUC of
Coadministered
Drug
(95% CI)		 Cmax of
Coadministered
Drug
(95% CI)
↑ Indicates increase.
↓ Indicates decrease.
↔ Indicates no change, or mean increase or decrease of less than 10%.
a The 95% confidence intervals for the percent change in the pharmacokinetic parameter are displayed.
b HIV-infected patients.
c Tenofovir disoproxil fumarate.
d Patients less than 60 kg with creatinine clearance of at least 60 mL/min.
NA = Not available.
   ciprofloxacin
 
   750 mg every 12 hours for 3 days, 2 hours before didanosine
 200 mg every 12
hours for 3 days
 8b
↓ 26%
 ↓ 16%
   750 mg single dose
 buffered placebo
tablet
 12
 ↓ 98%
 ↓ 93%
   delavirdine, 400 mg single dose simultaneous
 125 mg or 200 mg
every 12 hours
 12b
↓ 32%
 ↓ 53%
   1 hour before didanosine
 125 mg or 200 mg
every 12 hours
 12b
↑ 20%
 ↑ 18%
   ganciclovir, 1000 mg every 8 hours, 2 hours after didanosine
 200 mg every
12 hours
 12b
↓ 21%
 NA
   indinavir, 800 mg single dose simultaneous
 200 mg single dose
 16
 ↓ 84%
 ↓ 82%
   1 hour before didanosine
 200 mg single dose
 16
 ↓ 11%
 ↓ 4%
   ketoconazole, 200 mg/day for 4 days, 2 hours before didanosine
 375 mg every
12 hours for 4 days
 12b
↓ 14%
 ↓ 20%
   nelfinavir, 750 mg single dose, 1 hour after didanosine
 200 mg single dose
 10b
↑ 12%
 ↔
   dapsone, 100 mg single dose
 200 mg every 12
hours for 14 days
 6b
↔
 ↔
   ranitidine, 150 mg single dose, 2 hours before didanosine
 375 mg single dose
 12b
↓ 16%
 ↔
   ritonavir, 600 mg every 12 hours for 4 days
 200 mg every 12
hours for 4 days
 12
 ↔
 ↔
   stavudine, 40 mg every 12 hours for 4 days
 100 mg every 12
hours for 4 days
 10b
↔
 ↑ 17%
   sulfamethoxazole, 1000 mg single dose
 200 mg single dose
 8b
↓ 11%
(-17, -4%)
 ↓ 12%
(-28, 8%)
   tenofovir,c 300 mg once daily 1 hour after didanosine
 250d mg or 400 mg once
daily for 7 days
 14
 ↔
 ↔
   trimethoprim, 200 mg single dose
 200 mg single dose
 8b
↑ 10%
(-9, 34%)
 ↓ 22%
(-59, 49%)
   zidovudine, 200 mg every 8 hours for 3 days
 200 mg every 12
hours for 3 days
 6b
↓ 10%
(-27, 11%)
 ↓ 16.5%
(­-53, 47%)

12.4 Microbiology


Mechanism of Action



Antiviral Activity in Cell Culture

50

Resistance



Cross-resistance

13 NONCLINICAL TOXICOLOGY

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility






Escherichia coliin vitroin vitroin vitroSalmonellain vivo

13.2 Animal Toxicology and/or Pharmacology


14 CLINICAL STUDIES

14.1 Adult Patients


Combination Therapy



3310103
Didanosine

Table 15: Outcomes of Randomized Treatment Through Week 48, AI454-148
Week 48 Status Percent of Patients with HIV-1 RNA less than 400 copies/mL
(less than 50 copies/mL)
didanosine/stavudine/nelfinavir
n=503		 lamivudine/zidovudine/nelfinavir
n=253
* p less than 0.05 for the differences between treatment groups, by Cochran-Mantel-Haenszel test.
a Patients achieved virologic response [two consecutive viral loads less than 400 (less than 50) copies/mL] and maintained it to Week 48.
b Includes viral rebound and failing to achieve confirmed less than 400 (less than 50) copies/mL by Week 48.
c Includes lost to follow-up, noncompliance, withdrawal, and pregnancy.
   Respondera
50* (34*)
 59 (47)
   Virologic failureb
36 (57)
 32 (48)
   Death or disease progression
 less than 1 (less than 1)
 1 (less than 1)
   Discontinued due to adverse events
 4 (2)
 2 (less than 1)
   Discontinued due to other reasonsc
6 (3)
 4 (2)
   Never initiated treatment
 4 (4)
 2 (2)

Monotherapy



14.2 Pediatric Patients


2222

16 HOW SUPPLIED/STORAGE AND HANDLING


Didanosine Tablets for Oral Suspension USP, 100 mg



Didanosine Tablets for Oral Suspension USP, 150 mg



Didanosine Tablets for Oral Suspension USP, 200 mg



Storage
 

17 PATIENT COUNSELING INFORMATION


See Medication Guide.

17.1 Pancreatitis


17.2 Peripheral Neuropathy


17.3 Lactic Acidosis and Severe Hepatomegaly with Steatosis


17.4 Hepatic Toxicity


17.5 Non-cirrhotic Portal Hypertension


17.6 Retinal Changes and Optic Neuritis


17.7 Fat Redistribution


17.8 Concomitant Therapy




17.9 General Information




 
  • Do not share needles or other injection equipment.
  • Do not share personal items that can have blood or body fluids on them, like toothbrushes and razor blades.
  • Do not have any kind of sex without protection. Always practice safe sex by using a latex or polyurethane condom or other barrier method to lower the chance of sexual contact with semen, vaginal secretions, or blood.
  • Do not breastfeed. It is not known if didanosine can be passed to your baby in your breast milk and whether it could harm your baby. Also, mothers with HIV-1 should not breastfeed because HIV-1 can be passed to the baby in breast milk.










Aurobindo Pharma USA, Inc.




Aurobindo Pharma Limited


Medication Guide


Didanosine Tablets for Oral Suspension, USP


Phenylketonurics





What is the most important information I should know about didanosine tablets for oral suspension?
Didanosine tablets for oral suspension may cause serious side effects, including:

1. Swelling of your pancreas (pancreatitis) that may cause death. Pancreatitis can happen at any time during your treatment with didanosine tablets for oral suspension.
  • have had pancreatitis
  • have advanced HIV (human immunodeficiency virus) infection
  • have kidney problems
  • drink alcoholic beverages
  • take a medicine called ZERIT® (stavudine)

It is important to call your healthcare provider right away if you have:  

  • stomach pain
  • swelling of your stomach
  • nausea and vomiting
  • fever

2.  Build-up of acid in your blood (lactic acidosis). Lactic acidosis must be treated in the hospital as it may cause death. The risk for lactic acidosis may be higher if you:  

  • have liver problems
  • are pregnant. There have been deaths reported in pregnant women who get lactic acidosis after taking didanosine tablets for oral suspension and ZERIT (stavudine).
  • are overweight
  • have been treated for a long time with other medicines to treat HIV

It is important to call your health care provider right away if you:  

  • feel weak or tired
  • have unusual (not normal) muscle pain
  • have trouble breathing
  • have stomach pain with nausea and vomiting
  • feel cold, especially in your arms and legs
  • feel dizzy or light-headed
  • have a fast or irregular heartbeat

3.  Liver problems.

It is important to call your healthcare provider right away if you have: 
  • yellowing of your skin or the white of your eyes (jaundice)
  • dark urine
  • pain on the right side of your stomach
  • swelling of your stomach
  • easy bruising or bleeding
  • loss of appetite
  • nausea or vomiting
  • vomiting blood or dark colored stools (bowel movements)

What are didanosine tablets for oral suspension?
 




Who should not take didanosine tablets for oral suspension?
Do not take didanosine tablets for oral suspension if you take: 
  • ZYLOPRIM®, LOPURIN®, ALOPRIM® (allopurinol)
  • COPEGUS®, REBETOL®, RIBASPHERE®, RIBAVIRIN®, VIRAZOLE® (ribavirin)

What should I tell my healthcare provider before taking didanosine tablets for oral suspension?

  • have or had kidney problems
  • have or had liver problems (such as hepatitis)
  • have or had persistent numbness, tingling, or pain in the hands or feet (neuropathy)
  • have any other medical conditions
  • are pregnant or plan to become pregnant. It is not known if didanosine tablets for oral suspension will harm your unborn baby. Tell your healthcare provider right away if you become pregnant while taking didanosine tablets for oral suspension. You and your healthcare provider will decide if you should take didanosine tablets for oral suspension while you are pregnant.

Pregnancy Registry: There is a pregnancy registry for women who take antiviral medicines during pregnancy. The purpose of the registry is to collect information about the health of you and your baby. Talk to your doctor about how you can take part in this registry.

  • are breastfeeding or plan to breastfeed. Do not breastfeed. It is not known if didanosine can be passed to your baby in your breast milk and whether it could harm your baby. Also, mothers with HIV-1 should not breastfeed because HIV-1 can be passed to the baby in the breast milk.

Tell your healthcare provider about all the medicines you take,

Especially tell your healthcare provider if you take:
  • VIREAD® (tenofovir disoproxil fumarate)
  • DROXIA®, HYDREA® (hydroxyurea)
  • RESCRIPTOR® (delavirdine mesylate)
  • CYTOVENE®, VALCYTE® (ganciclovir)
  • CRIXIVAN® (indinavir)
  • DOLOPHINE® HYDROCHLORIDE, METHADOSE® (methadone)
  • VIRACEPT® (nelfinavir)
  • antacids
  • antifungal medicines such as NIZORAL® (ketoconazole) or SPORANOX® (itraconazole)
  • quinolone antibiotics such as CIPRO®, PROQUIN® XR (ciprofloxacin)
  • tetracycline antibiotics such as BRISTACYCLINE®, SUMYCIN® (tetracycline) 
  • alcoholic beverages





How should I take didanosine tablets for oral suspension? 
  • Take didanosine tablets for oral suspension exactly as your healthcare provider tells you to take them.
  • Your healthcare provider will tell you how much didanosine tablets for oral suspension to take and when to take them.
  • Your healthcare provider may change your dose. Do not change your dose of didanosine tablets for oral suspension without talking to your healthcare provider.
  • Do not take didanosine tablets for oral suspension with food. Take didanosine tablets for oral suspension on an empty stomach at least 30 minutes before or 2 hours after you eat.
  • Try not to miss a dose, but if you do, take it as soon as possible. If it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule.
  • Some medicines should not be taken at the same time of day that you take didanosine tablets for oral suspension. Check with your healthcare provider.
  • If your kidneys are not working well, your healthcare provider will need to do regular blood and urine tests to check how they are working while you take didanosine tablets for oral suspension. Your healthcare provider may also lower your dosage of didanosine tablets for oral suspension if your kidneys are not working well.
  • If you take too much didanosine tablets for oral suspension, contact a poison control center or emergency room right away.

What should I avoid while taking didanosine tablets for oral suspension? 

  • Alcohol. Do not drink alcohol while you take didanosine tablets for oral suspension. Alcohol may increase your risk of getting pain and swelling of your pancreas (pancreatitis) or may damage your liver.

What are the possible side effects of didanosine tablets for oral suspension?

“What is the most important information I should know about didanosine tablets for oral suspension?”
  • Vision changes. You should have regular eye exams while you take didanosine tablets for oral suspension.
  • Peripheral neuropathy. Symptoms include: numbness, tingling, or pain in your hands or feet. This condition is more likely to happen in people who have had it before, in patients taking medicines that affect the nerves, and in people with advanced HIV disease. A child may not notice these symptoms. Ask your child’s healthcare provider for the signs and symptoms of peripheral neuropathy in children.
  • Changes in your immune system (immune reconstitution syndrome). Your immune system may get stronger and begin to fight infections that have been hidden in your body for a long time. Tell your healthcare provider if you start having new or worse symptoms of infection after you start taking HIV medicine.
  • Changes in body fat (fat redistribution). Changes in body fat have been seen in people who take antiretroviral medicines. These changes may include:  
  • more fat in or around your



  • less fat in your







  • diarrhea
  • stomach pain
  • nausea
  •  vomiting
  • headache
  •  rash







How should I store didanosine tablets for oral suspension?
 
  • Safely throw away any unused didanosine tablets for oral suspension after 30 days.

Keep didanosine tablets for oral suspension and all medicines out of the reach of children and pets.
General information about the safe and effective use of didanosine tablets for oral suspension

  • Do not share needles or other injection equipment.
  • Do not share personal items that can have blood or body fluids on them, like toothbrushes and razor blades.
  • Do not have any kind of sex without protection. Always practice safe sex by using a latex or polyurethane condom or other barrier method to lower the chance of sexual contact with semen, vaginal secretions, or blood.






What are the ingredients in didanosine tablets for oral suspension?
 
Active Ingredient:

Inactive Ingredients:




Aurobindo Pharma USA, Inc.




Aurobindo Pharma Limited




PACKAGE LABEL-PRINCIPAL DISPLAY PANEL - 100 mg (60 Tablet Bottle)


NDC 65862-092-60
Didanosine Tablets for
Oral Suspension, USP


100 mg
PHARMACIST: Dispense the accompanying
Medication Guide to each patient.
Rx only                                            60 Tablets
AUROBINDO
Didanosine

PACKAGE LABEL-PRINCIPAL DISPLAY PANEL - 150 mg (60 Tablet Bottle)


NDC 65862-093-60
Didanosine Tablets for
Oral Suspension, USP


150 mg
PHARMACIST: Dispense the accompanying
Medication Guide to each patient.
Rx only                                            60 Tablets
AUROBINDO
Didanosine

PACKAGE LABEL-PRINCIPAL DISPLAY PANEL - 200 mg (60 Tablet Bottle)


NDC 65862-094-60
Didanosine Tablets for
Oral Suspension, USP


200 mg
PHARMACIST: Dispense the accompanying
Medication Guide to each patient.
Rx only                                            60 Tablets
AUROBINDO
Didanosine

Didanosine

Didanosine TABLET, FOR SUSPENSION

Product Information

Product Type Human prescription drug label Item Code (Source) NDC:65862-092
Route of Administration ORAL DEA Schedule

Active Ingredient/Active Moiety

Ingredient Name Basis of Strength Strength
DIDANOSINE didanosine 100 mg

Inactive Ingredients

Ingredient Name Strength
CALCIUM CARBONATE
magnesium hydroxide
ASPARTAME
CROSPOVIDONE
MAGNESIUM STEARATE
cellulose, microcrystalline
ORANGE
sorbitol

Product Characteristics

Color Size Imprint Code Shape
WHITE (White to Off-white) 20 mm D;45 ROUND

Packaging

# Item Code Package Description Marketing Start Date Marketing End Date
1 NDC:65862-092-60 60 in 1 BOTTLE

Marketing Information

Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
ANDA ANDA077275 2012-08-14


Didanosine

Didanosine TABLET, FOR SUSPENSION

Product Information

Product Type Human prescription drug label Item Code (Source) NDC:65862-093
Route of Administration ORAL DEA Schedule

Active Ingredient/Active Moiety

Ingredient Name Basis of Strength Strength
DIDANOSINE didanosine 150 mg

Inactive Ingredients

Ingredient Name Strength
CALCIUM CARBONATE
magnesium hydroxide
ASPARTAME
CROSPOVIDONE
MAGNESIUM STEARATE
cellulose, microcrystalline
ORANGE
sorbitol

Product Characteristics

Color Size Imprint Code Shape
WHITE (White to Off-white) 20 mm D;46 ROUND

Packaging

# Item Code Package Description Marketing Start Date Marketing End Date
1 NDC:65862-093-60 60 in 1 BOTTLE

Marketing Information

Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
ANDA ANDA077275 2012-08-14


Didanosine

Didanosine TABLET, FOR SUSPENSION

Product Information

Product Type Human prescription drug label Item Code (Source) NDC:65862-094
Route of Administration ORAL DEA Schedule

Active Ingredient/Active Moiety

Ingredient Name Basis of Strength Strength
DIDANOSINE didanosine 200 mg

Inactive Ingredients

Ingredient Name Strength
CALCIUM CARBONATE
magnesium hydroxide
ASPARTAME
CROSPOVIDONE
MAGNESIUM STEARATE
cellulose, microcrystalline
ORANGE
sorbitol

Product Characteristics

Color Size Imprint Code Shape
WHITE (White to Off-white) 20 mm D;47 ROUND

Packaging

# Item Code Package Description Marketing Start Date Marketing End Date
1 NDC:65862-094-60 60 in 1 BOTTLE

Marketing Information

Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
ANDA ANDA077275 2012-08-14


PLEASE, BE CAREFUL!
Be sure to consult your doctor before taking any medication!
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