September 2, 2015
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Lexiva

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Lexiva




Side Effects
Interactions

SIDE EFFECTS

  • Severe or life-threatening skin reactions have been reported with the use of LEXIVA [see WARNINGS AND PRECAUTIONS].
  • The most common moderate to severe adverse reactions in clinical trials of LEXIVA were diarrhea, rash, nausea, vomiting, and headache.
  • Treatment discontinuation due to adverse events occurred in 6.4% of subjects receiving LEXIVA and in 5.9% of subjects receiving comparator treatments. The most common adverse reactions leading to discontinuation of LEXIVA (incidence less than or equal to 1% of subjects) included diarrhea, nausea, vomiting, AST increased, ALT increased, and rash.

Clinical Trials

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared with rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.

Adult Trials

The data for the 3 active-controlled clinical trials described below reflect exposure of 700 HIV-1-infected subjects to LEXIVA tablets, including 599 subjects exposed to LEXIVA for greater than 24 weeks, and 409 subjects exposed for greater than 48 weeks. The population age ranged from 17 to 72 years. Of these subjects, 26% were female, 51% white, 31% black, 16% American Hispanic, and 70% were antiretroviral-naive. Sixty-one percent received LEXIVA 1,400 mg once daily plus ritonavir 200 mg once daily; 24% received LEXIVA 1,400 mg twice daily; and 15% received LEXIVA 700 mg twice daily plus ritonavir 100 mg twice daily.

Selected adverse reactions reported during the clinical efficacy trials of LEXIVA are shown in Tables 3 and 4. Each table presents adverse reactions of moderate or severe intensity in subjects treated with combination therapy for up to 48 weeks.

Table 3: Selected Moderate/Severe Clinical Adverse Reactions Reported in Greater than or Equal to 2% of Antiretroviral-naive Adult Subjects

Adverse Reaction APV30001a APV30002a
LEXIVA 1,400 mg b.i.d.
(n = 166)
Nelfinavir 1,250 mg b.i.d.
(n = 83)
LEXIVA 1,400 mg q.d./ Ritonavir 200 mg q.d.
(n = 322)
Nelfinavir 1,250 mg b.i.d.
(n = 327)
Gastrointestinal
  Diarrhea 5% 18% 10% 18%
  Nausea 7% 4% 7% 5%
  Vomiting 2% 4% 6% 4%
  Abdominal pain 1% 0% 2% 2%
Skin
  Rash 8% 2% 3% 2%
General disorders
  Fatigue 2% 1% 4% 2%
Nervous system
  Headache 2% 4% 3% 3%
a All subjects also received abacavir and lamivudine twice daily.

Table 4: Selected Moderate/Severe Clinical Adverse Reactions Reported in Greater than or Equal to 2% of Protease Inhibitor-experienced Adult Subjects (Trial APV30003)

Adverse Reaction LEXIVA 700 mg b.i.d./ Ritonavir 100 mg b.i.d.a
(n = 106)
Lopinavir 400 mg b.i.d./ Ritonavir 100 mg b.i.d.a
(n = 103)
Gastrointestinal
  Diarrhea 13% 11%
  Nausea 3% 9%
  Vomiting 3% 5%
  Abdominal pain < 1% 2%
Skin
  Rash 3% 0%
Nervous system
  Headache 4% 2%
a All subjects also received 2 reverse transcriptase inhibitors.

Skin rash (without regard to causality) occurred in approximately 19% of subjects treated with LEXIVA in the pivotal efficacy trials. Rashes were usually maculopapular and of mild or moderate intensity, some with pruritus. Rash had a median onset of 11 days after initiation of LEXIVA and had a median duration of 13 days. Skin rash led to discontinuation of LEXIVA in less than 1% of subjects. In some subjects with mild or moderate rash, dosing with LEXIVA was often continued without interruption; if interrupted, reintroduction of LEXIVA generally did not result in rash recurrence.

The percentages of subjects with Grade 3 or 4 laboratory abnormalities in the clinical efficacy trials of LEXIVA are presented in Tables 5 and 6.

Table 5: Grade 3/4 Laboratory Abnormalities Reported in Greater than or Equal to 2% of Antiretroviral-naive Adult Subjects in Trials APV30001 and APV30002

Laboratory Abnormality APV30001a APV30002a
LEXIVA 1,400 mg b.i.d.
(n = 166)
Nelfinavir 1,250 mg b.i.d.
(n = 83)
LEXIVA 1,400 mg q.d./Ritonavir
200 mg q.d.
(n = 322)
Nelfinavir 1,250 mg b.i.d.
(n = 327)
ALT ( > 5 x ULN) 6% 5% 8% 8%
AST ( > 5 x ULN) 6% 6% 6% 7%
Serum lipase ( > 2 x ULN) 8% 4% 6% 4%
Triglyceridesb ( > 750 mg/dL) 0% 1% 6% 2%
Neutrophil count, absolute ( < 750 cells/mm³) 3% 6% 3% 4%
a All subjects also received abacavir and lamivudine twice daily.
b Fasting specimens.
ULN = Upper limit of normal.

The incidence of Grade 3 or 4 hyperglycemia in antiretroviral-naive subjects who received LEXIVA in the pivotal trials was less than 1%.

Table 6: Grade 3/4 Laboratory Abnormalities Reported in Greater than or Equal to 2% of Protease Inhibitor-experienced Adult Subjects in Trial APV30003

Laboratory Abnormality LEXIVA 700 mg b.i.d./ Ritonavir 100 mg b.i.d.a
(n = 104)
Lopinavir 400 mg b.i.d./ Ritonavir 100 mg b.i.d.a
(n = 103)
Triglyceridesb ( > 750 mg/dL) 11%c 6%c
Serum lipase ( > 2 x ULN) 5% 12%
ALT ( > 5 x ULN) 4% 4%
AST ( > 5 x ULN) 4% 2%
Glucose ( > 251 mg/dL) 2%c 2%c
a All subjects also received 2 reverse transcriptase inhibitors.
b Fasting specimens.
c n = 100 for LEXIVA plus ritonavir, n = 98 for lopinavir plus ritonavir.
ULN = Upper limit of normal.

Pediatric Trials

LEXIVA with and without ritonavir was studied in 237 HIV-1-infected pediatric subjects aged at least 4 weeks to 18 years in 3 open-label trials; APV20002, APV20003, and APV29005 [see Clinical Studies]. Vomiting and neutropenia occurred more frequently in pediatric subjects compared with adults. Other adverse events occurred with similar frequency in pediatric subjects compared with adults.

The frequency of vomiting among pediatric subjects receiving LEXIVA twice daily with ritonavir was 20% in subjects aged at least 4 weeks to less than 2 years and 36% in subjects aged 2 to 18 years compared with 10% in adults. The frequency of vomiting among pediatric subjects receiving LEXIVA twice daily without ritonavir was 60% in subjects aged 2 to 5 years compared with 16% in adults.

The median duration of drug-related vomiting episodes in APV29005 was 1 day (range: 1 to 3 days), in APV20003 was 16 days (range: 1 to 38 days), and in APV20002 was 9 days (range: 4 to 13 days). Vomiting was treatment limiting in 4 pediatric subjects across all 3 trials.

The incidence of Grade 3 or 4 neutropenia (neutrophils less than 750 cells per mm³) seen in pediatric subjects treated with LEXIVA with and without ritonavir was higher (15%) than the incidence seen in adult subjects (3%). Grade 3/4 neutropenia occurred in 10% (5 of 51) of subjects aged at least 4 weeks to less than 2 years and 16% (28 of 170) of subjects aged 2 to 18 years.

Postmarketing Experience

The following adverse reactions have been identified during postapproval use of LEXIVA. Because these reactions are reported voluntarily from a population of unknown size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. These reactions have been chosen for inclusion due to a combination of their seriousness, frequency of reporting, or potential causal connection to LEXIVA.

Cardiac Disorders

Myocardial infarction.

Metabolism and Nutrition Disorders

Hypercholesterolemia.

Nervous System Disorders

Oral paresthesia.

Skin and Subcutaneous Tissue Disorders

Angioedema.

Urogenital

Nephrolithiasis.

Read the Lexiva (fosamprenavir calcium) Side Effects Center for a complete guide to possible side effects

DRUG INTERACTIONS

See also CONTRAINDICATIONS, CLINICAL PHARMACOLOGY.

If LEXIVA is used in combination with ritonavir, see full prescribing information for ritonavir for additional information on drug interactions.

Cytochrome P450 Inhibitors And Inducers

Amprenavir, the active metabolite of fosamprenavir, is an inhibitor of CYP3A4 metabolism and therefore should not be administered concurrently with medications with narrow therapeutic windows that are substrates of CYP3A4. Data also suggest that amprenavir induces CYP3A4.

Amprenavir is metabolized by CYP3A4. Coadministration of LEXIVA and drugs that induce CYP3A4, such as rifampin, may decrease amprenavir concentrations and reduce its therapeutic effect. Coadministration of LEXIVA and drugs that inhibit CYP3A4 may increase amprenavir concentrations and increase the incidence of adverse effects.

The potential for drug interactions with LEXIVA changes when LEXIVA is coadministered with the potent CYP3A4 inhibitor ritonavir. The magnitude of CYP3A4-mediated drug interactions (effect on amprenavir or effect on coadministered drug) may change when LEXIVA is coadministered with ritonavir. Because ritonavir is a CYP2D6 inhibitor, clinically significant interactions with drugs metabolized by CYP2D6 are possible when coadministered with LEXIVA plus ritonavir.

There are other agents that may result in serious and/or life-threatening drug interactions [see CONTRAINDICATIONS].

Drugs That Should Not Be Coadministered With LEXIVA

See CONTRAINDICATIONS.

Established And Other Potentially Significant Drug Interactions

Table 7 provides a listing of established or potentially clinically significant drug interactions. Information in the table applies to LEXIVA with or without ritonavir, unless otherwise indicated.

Table 7: Established and Other Potentially Significant Drug Interactions

Concomitant Drug Class: Drug Name Effect on Concentration of Amprenavir or Concomitant Drug Clinical Comment
HCV/HIV-Antiviral Agents
HCV protease inhibitor: Boceprevir LEXIVA/ritonavir: ↓Amprenavir (predicted) ↓Boceprevir (predicted) Coadministration of LEXIVA/ritonavir and boceprevir is not recommended.
A pharmacokinetic interaction has been reported between boceprevir and some HIV protease inhibitors in combination with ritonavir, leading to decreased HIV protease inhibitor concentrations and, in some cases, decreased boceprevir concentrations.
Non-nucleoside reverse transcriptase inhibitor: Efavirenza LEXIVA:
↓Amprenavir
Appropriate doses of the combinations with respect to safety and efficacy have not been established.
LEXIVA/ritonavir: ↓Amprenavir An additional 100 mg/day (300 mg total) of ritonavir is recommended when efavirenz is administered with LEXIVA/ritonavir once daily. No change in the ritonavir dose is required when efavirenz is administered with LEXIVA plus ritonavir twice daily.
Non-nucleoside reverse transcriptase inhibitor: Nevirapinea LEXIVA:
↓Amprenavir
↑Nevirapine
Coadministration of nevirapine and LEXIVA without ritonavir is not recommended.
LEXIVA/ritonavir: ↓Amprenavir
↑Nevirapine
No dosage adjustment required when nevirapine is administered with LEXIVA/ritonavir twice daily.
The combination of nevirapine administered with LEXIVA/ritonavir once-daily regimen has not been studied.
HIV protease inhibitor: Atazanavira LEXIVA: Interaction has not been evaluated.
LEXIVA/ritonavir: ↓Atazanavir ↔Amprenavir
Appropriate doses of the combinations with respect to safety and efficacy have not been established.
HIV protease inhibitors: Indinavira, nelfinavira LEXIVA:↑Amprenavir
Effect on indinavir and nelfinavir is not well established. LEXIVA/ritonavir: Interaction has not been evaluated.
Appropriate doses of the combinations with respect to safety and efficacy have not been established.
HIV protease inhibitors: Lopinavir/ritonavira ↓Amprenavir
↓Lopinavir
An increased rate of adverse events has been observed. Appropriate doses of the combinations with respect to safety and efficacy have not been established.
HIV protease inhibitor: Saquinavira LEXIVA:
↓Amprenavir
Effect on saquinavir is not well established.
LEXIVA/ritonavir: Interaction has not been evaluated.
Appropriate doses of the combination with respect to safety and efficacy have not been established.
HIV integrase inhibitor: Raltegravira LEXIVA:
↓Amprenavir
↓Raltegravir LEXIVA/ritonavir: ↓Amprenavir
↓Raltegravir
Appropriate doses of the combination with respect to safety and efficacy have not been established.
HIV integrase inhibitor: Dolutegravira LEXIVA/ritonavir: ↓Dolutegravir The recommended dose of dolutegravir is 50 mg twice daily when coadministered with LEXIVA/ritonavir.
Use an alternative combination where possible in patients with known or suspected integrase inhibitor resistance.
HIV CCR5 co-receptor antagonist: Maraviroca LEXIVA/ritonavir: ↓Amprenavir ↑Maraviroc No dosage adjustment required for LEXIVA/ritonavir. The recommended dose of maraviroc is 150 mg twice daily when coadministered with LEXIVA/ritonavir.
LEXIVA should be given with ritonavir when coadministered with maraviroc.
Other Agents
Antiarrhythmics: Amiodarone, lidocaine (systemic), and quinidine ↑ Antiarrhythmics Use with caution. Increased exposure may be associated with life-threatening reactions such as cardiac arrhythmias. Therapeutic concentration monitoring, if available, is recommended for antiarrhythmics.
Anticoagulant: Warfarin   Concentrations of warfarin may be affected. It is recommended that INR (international normalized ratio) be monitored.
Anticonvulsants: Carbamazepine, phenobarbital, phenytoin LEXIVA: ↓Amprenavir Use with caution. LEXIVA may be less effective due to decreased amprenavir plasma concentrations in patients taking these agents concomitantly.
Phenytoina LEXIVA/ritonavir: ↑Amprenavir
↓Phenytoin
Plasma phenytoin concentrations should be monitored and phenytoin dose should be increased as appropriate. No change in LEXIVA/ritonavir dose is recommended.
Antidepressant: Paroxetine, trazodone ↓Paroxetine Coadministration of paroxetine with LEXIVA/ritonavir significantly decreased plasma levels of paroxetine. Any paroxetine dose adjustment should be guided by clinical effect (tolerability and efficacy).
↑Trazodone Concomitant use of trazodone and LEXIVA with or without ritonavir may increase plasma concentrations of trazodone. Adverse events of nausea, dizziness, hypotension, and syncope have been observed following coadministration of trazodone and ritonavir. If trazodone is used with a CYP3A4 inhibitor such as LEXIVA, the combination should be used with caution and a lower dose of trazodone should be considered.
Antifungals: Ketoconazolea, itraconazole ↑Ketoconazole ↑Itraconazole Increase monitoring for adverse events.
LEXIVA: Dose reduction of ketoconazole or itraconazole may be needed for patients receiving more than 400 mg ketoconazole or itraconazole per day.
LEXIVA/ritonavir: High doses of ketoconazole or itraconazole (greater than 200 mg/day) are not recommended.
Anti-gout: Colchicine ↑Colchicine Patients with renal or hepatic impairment should not be given colchicine with LEXIVA/ritonavir.
LEXIVA/ritonavir and coadministration of colchicine:
Treatment of gout flares: 0.6 mg (1 tablet) x 1 dose, followed by 0.3 mg (half tablet) 1 hour later. Dose to be repeated no earlier than 3 days.
Prophylaxis of gout flares: If the original regimen was 0.6 mg twice a day, the regimen should be adjusted to 0.3 mg once a day. If the original regimen was 0.6 mg once a day, the regimen should be adjusted to 0.3 mg once every other day. Treatment of familial
Mediterranean fever (FMF): Maximum daily dose of 0.6 mg (may be given as 0.3 mg twice a day).
LEXIVA and coadministration of colchicine:
Treatment of gout flares:
1.2 mg (2 tablets) x 1 dose. Dose to be repeated no earlier than 3 days.
Prophylaxis of gout flares:
If the original regimen was 0.6 mg twice a day, the regimen should be adjusted to 0.3 mg twice a day or 0.6 mg once a day.
If the original regimen was 0.6 mg once a day, the regimen should be adjusted to 0.3 mg once a day.
Treatment of FMF:
Maximum daily dose of 1.2 mg (may be given as 0.6 mg twice a day).
Antimycobacterial: Rifabutina ↑Rifabutin and rifabutin metabolite A complete blood count should be performed weekly and as clinically indicated to monitor for neutropenia.
LEXIVA: A dosage reduction of rifabutin by at least half the recommended dose is required.
LEXIVA/ritonavir: Dosage reduction of rifabutin by at least 75% of the usual dose of 300 mg/day is recommended (a maximum dose of 150 mg every other day or 3 times per week).
Antipsychotics: Quetiapine LEXIVA/ritonavir: ↑Quetiapine Initiation of LEXIVA with ritonavir in patients taking auetiapine:
Consider alternative antiretroviral therapy to avoid increases in quetiapine drug exposures. If coadministration is necessary, reduce the quetiapine dose to 1/6 of the current dose and monitor for quetiapine-associated adverse reactions. Refer to the quetiapine prescribing information for recommendations on adverse reaction monitoring. Initiation of quetiapine in patients taking LEXIVA with ritonavir: Refer to the quetiapine prescribing information for initial dosing and titration of quetiapine.
Benzodiazepines: Alprazolam, clorazepate, diazepam, flurazepam ↑Benzodiazepines Clinical significance is unknown. A decrease in benzodiazepine dose may be needed.
Calcium channel blockers: Diltiazem, felodipine, nifedipine, nicardipine, nimodipine, verapamil, amlodipine, nisoldipine, isradipine ↑Calcium channel blockers Use with caution. Clinical monitoring of patients is recommended.
Corticosteroid: Dexamethasone ↓Amprenavir Use with caution. LEXIVA may be less effective due to decreased amprenavir plasma concentrations.
Endothelin-receptor antagonists: Bosentan ↑Bosentan Coadministration of bosentan in patients on LEXIVA:
In patients who have been receiving LEXIVA for at least 10 days, start bosentan at 62.5 mg once daily or every other day based upon individual tolerability.
Coadministration of LEXIVA in patients on bosentan:
Discontinue use of bosentan at least 36 hours prior to initiation of LEXIVA.
After at least 10 days following the initiation of LEXIVA, resume bosentan at 62.5 mg once daily or every other day based upon individual tolerability.
Histamine H2-receptor antagonists: Cimetidine, famotidine, nizatidine, ranitidinea LEXIVA:
↓Amprenavir LEXIVA/ritonavir: Interaction not evaluated
Use with caution. LEXIVA may be less effective due to decreased amprenavir plasma concentrations.
HMG-CoA reductase inhibitors: Atorvastatina ↑Atorvastatin Titrate atorvastatin dose carefully and use the lowest necessary dose; do not exceed atorvastatin 20 mg/day.
Immunosuppressants: Cyclosporine, tacrolimus, sirolimus ↑Immunosuppressants Therapeutic concentration monitoring is recommended for immunosuppressant agents.
Inhaled beta-agonist: Salmeterol ↑Salmeterol Concurrent administration of salmeterol with LEXIVA is not recommended. The combination may result in increased risk of cardiovascular adverse events associated with salmeterol, including QT prolongation, palpitations, and sinus tachycardia.
Inhaled/nasal steroid: Fluticasone LEXIVA:↑Fluticasone LEXIVA/ritonavir: ↑Fluticasone Use with caution. Consider alternatives to fluticasone, particularly for long-term use.
May result in significantly reduced serum cortisol concentrations. Systemic corticosteroid effects including Cushing’s syndrome and adrenal suppression have been reported during postmarketing use in patients receiving ritonavir and inhaled or intranasally administered fluticasone. Coadministration of fluticasone and LEXIVA/ritonavir is not recommended unless the potential benefit to the patient outweighs the risk of systemic corticosteroid side effects.
Narcotic analgesic: Methadone ↓Methadone Data suggest that the interaction is not clinically relevant; however, patients should be monitored for opiate withdrawal symptoms.
Oral contraceptives: Ethinyl estradiol/ norethindronea LEXIVA:
↓Amprenavir
↓Ethinyl estradiol LEXIVA/ritonavir: ↓Ethinyl estradiol
Alternative methods of non-hormonal contraception are recommended.
May lead to loss of virologic response.a
Increased risk of transaminase elevations. No data are available on the use of LEXIVA/ritonavir with other hormonal therapies, such as hormone replacement therapy (HRT) for postmenopausal women.
PDE5 inhibitors: Sildenafil, tadalafil, vardenafil ↑Sildenafil
↑Tadalafil
↑Vardenafil
May result in an increase in PDE5 inhibitor-associated adverse events, including hypotension, syncope, visual disturbances, and priapism.
Use of PDE5 inhibitors for pulmonary arterial hypertension (PAH):
  • Use of sildenafil (REVATIO) is contraindicated when used for the treatment of PAH [see CONTRAINDICATIONS].
  • The following dose adjustments are recommended for use of tadalafil (ADCIRCA®) with LEXIVA:

Coadministration of ADCIRCA in patients on LEXIVA:
In patients receiving LEXIVA for at least one week, start ADCIRCA at 20 mg once daily. Increase to 40 mg once daily based upon individual tolerability.
Coadministration of LEXIVA in patients on ADCIRCA:
Avoid use of ADCIRCA during the initiation of LEXIVA. Stop ADCIRCA at least 24 hours prior to starting LEXIVA. After at least one week following the initiation of LEXIVA, resume ADCIRCA at 20 mg once daily. Increase to 40 mg once daily based upon individual tolerability.
Use of PDE5 inhibitors for erectile dysfunction:
LEXIVA:

Sildenafil: 25 mg every 48 hours. Tadalafil: no more than 10 mg every 72 hours. Vardenafil: no more than 2.5 mg every 24 hours.
LEXIVA/ritonavir:
Sildenafil: 25 mg every 48 hours. Tadalafil: no more than 10 mg every 72 hours. Vardenafil: no more than 2.5 mg every 72 hours. Use with increased monitoring for adverse events.

Proton pump inhibitors: Esomeprazolea, lansoprazole, omeprazole, pantoprazole, rabeprazole LEXIVA:
↔Amprenavir ↑Esomeprazole LEXIVA/ritonavir: ↔Amprenavir ↔Esomeprazole
Proton pump inhibitors can be administered at the same time as a dose of LEXIVA with no change in plasma amprenavir concentrations.
Tricyclic antidepressants: Amitriptyline, imipramine ↑Tricyclics Therapeutic concentration monitoring is recommended for tricyclic antidepressants.
a See CLINICAL PHARMACOLOGY Tables 10, 11, 12, or 13 for magnitude of interaction.

Read the Lexiva Drug Interactions Center for a complete guide to possible interactions

Last reviewed on RxList: 8/7/2015
This monograph has been modified to include the generic and brand name in many instances.

Side Effects
Interactions

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