RILPIVIRINE Drug Interactions: What You Need to Know

INTERACTIONS Rilpivirine is primarily metabolized by cytochrome P450 (CYP)3A, and drugs that induce or inhibit CYP3A may thus affect the clearance of rilpivirine. Coadministration of rilpivirine tablets and drugs that induce CYP3A may result in decreased plasma concentrations of rilpivirine and loss of virologic response and possible resistance to rilpivirine or to the class of NNRTIs. Coadministration of rilpivirine tablets and drugs that inhibit CYP3A may result in increased plasma concentrations of rilpivirine. Coadministration of rilpivirine tablets with drugs that increase gastric pH may result in decreased plasma concentrations of rilpivirine and loss of virologic response and possible resistance to rilpivirine or to the class of NNRTIs. Rilpivirine tablets at the recommended doses are not likely to have a clinically relevant effect on the exposure of drugs metabolized by CYP enzymes.

Table

6 shows the established and other potentially significant drug interactions based on which alterations in dose or regimen of rilpivirine tablets and/or coadministered drug may be recommended. Drugs that are not recommended for coadministration with rilpivirine tablets are also included in Table 6. [see Dosage and Administration ( 2 ), Contraindications ( 4 ), and Clinical Pharmacology ( 12.3 )].

Table

6: Established and Other Potentially Significant Drug Interactions: Alterations in Dose or Regimen May Be Recommended Based on Drug Interaction Studies or Predicted Interaction [see Clinical Pharmacology (12.3)] ↑=increase, ↓=decrease, ↔=no change * The interaction between rilpivirine tablets and the drug was evaluated in a clinical study. All other drug-drug interactions shown are predicted. † This interaction study has been performed with a dose higher than the recommended dose for rilpivirine tablets assessing the maximal effect on the coadministered drug. The dosing recommendation is applicable to the recommended doses of rilpivirine once daily.

Concomitant Drug

Class: Drug Name Effect on Concentration of Rilpivirine or Concomitant Drug Clinical Comment Antacids: antacids (e.g., aluminum or magnesium hydroxide, calcium carbonate) ↔ rilpivirine (antacids taken at least 2 hours before or at least 4 hours after rilpivirine) ↓ rilpivirine (concomitant intake) The combination of rilpivirine tablets and antacids should be used with caution as coadministration may cause significant decreases in rilpivirine plasma concentrations (increase in gastric pH). Antacids should only be administered either at least 2 hours before or at least 4 hours after rilpivirine tablets. Anticonvulsants: carbamazepine oxcarbazepine phenobarbital phenytoin ↓ rilpivirine Coadministration is contraindicated with rilpivirine tablets [see Contraindications (4) ] Antimycobacterials: rifampin rifapentine ↓ rilpivirine Coadministration is contraindicated with rilpivirine tablets [see Contraindications (4) ] Antimycobacterials: rifabutin * ↓ rilpivirine Concomitant use of rilpivirine tablets with rifabutin may cause a decrease in the plasma concentrations of rilpivirine (induction of CYP3A enzymes). Throughout coadministration of rilpivirine tablets with rifabutin, the rilpivirine tablets dose should be increased from 25 mg once daily to 50 mg once daily. When rifabutin coadministration is stopped, the rilpivirine tablets dose should be decreased to 25 mg once daily.

Azole Antifungal

Agents: fluconazole itraconazole ketoconazole *† posaconazole voriconazole ↑ rilpivirine ↓ ketoconazole Concomitant use of rilpivirine tablets with azole antifungal agents may cause an increase in the plasma concentrations of rilpivirine (inhibition of CYP3A enzymes). No rilpivirine dose adjustment is required when rilpivirine tablets are coadministered with azole antifungal agents. Clinically monitor for breakthrough fungal infections when azole antifungals are coadministered with rilpivirine tablets. Glucocorticoid (systemic): dexamethasone (more than a single-dose treatment) ↓ rilpivirine Coadministration is contraindicated with rilpivirine tablets [see Contraindications (4) ] H 2 -Receptor Antagonists: cimetidine famotidine *† nizatidine ranitidine ↔ rilpivirine (famotidine taken 12 hours before rilpivirine or 4 hours after rilpivirine) ↓ rilpivirine (famotidine taken 2 hours before rilpivirine) The combination of rilpivirine tablets and H 2 -receptor antagonists should be used with caution as coadministration may cause significant decreases in rilpivirine plasma concentrations (increase in gastric pH). H 2 -receptor antagonists should only be administered at least 12 hours before or at least 4 hours after rilpivirine tablets.

Herbal

Products: St. John's wort (Hypericum perforatum) ↓ rilpivirine Coadministration is contraindicated with rilpivirine tablets [see Contraindications (4) ] HIV-Antiviral Agents: Non-nucleoside Reverse Transcriptase Inhibitors (NNRTIs) NNRTI (delavirdine) Other NNRTIs (efavirenz, etravirine, nevirapine) ↑ rilpivirine ↔ delavirdine ↓ rilpivirine ↔ other NNRTIs It is not recommended to coadminister rilpivirine tablets with delavirdine and other NNRTIs. HIV-Antiviral Agents: Nucleoside Reverse Transcriptase Inhibitors (NRTIs) didanosine *† ↔ rilpivirine ↔ didanosine No dose adjustment is required when rilpivirine tablets are coadministered with didanosine. Didanosine is to be administered on an empty stomach and at least two hours before or at least four hours after rilpivirine tablets (which should be administered with a meal). HIV-Antiviral Agents: Protease Inhibitors (PIs)-Boosted (i.e., with coadministration of low-dose ritonavir) or Unboosted (i.e., without coadministration of low-dose ritonavir) darunavir/ritonavir *† ↑ rilpivirine ↔ boosted darunavir Concomitant use of rilpivirine tablets with darunavir/ritonavir may cause an increase in the plasma concentrations of rilpivirine (inhibition of CYP3A enzymes). No dose adjustment is required when rilpivirine tablets are coadministered with darunavir/ritonavir. Lopinavir/ritonavir *† ↑ rilpivirine ↔ boosted lopinavir Concomitant use of rilpivirine tablets with lopinavir/ritonavir may cause an increase in the plasma concentrations of rilpivirine (inhibition of CYP3A enzymes). No dose adjustment is required when rilpivirine tablets are coadministered with lopinavir/ritonavir. Other boosted PIs (atazanavir/ritonavir, fosamprenavir/ritonavir, saquinavir/ritonavir, tipranavir/ritonavir) ↑ rilpivirine ↔ boosted PI Concomitant use of rilpivirine tablets with boosted PIs may cause an increase in the plasma concentrations of rilpivirine (inhibition of CYP3A enzymes). Rilpivirine tablets are not expected to affect the plasma concentrations of coadministered PIs. Unboosted PIs (atazanavir, fosamprenavir, indinavir, nelfinavir) ↑ rilpivirine ↔ unboosted PI Concomitant use of rilpivirine tablets with unboosted PIs may cause an increase in the plasma concentrations of rilpivirine (inhibition of CYP3A enzymes). Rilpivirine tablets are not expected to affect the plasma concentrations of coadministered PIs. Macrolide or ketolide antibiotics: azithromycin clarithromycin erythromycin ↑ rilpivirine ↔ azithromycin ↔ clarithromycin ↔ erythromycin Macrolides are expected to increase concentrations of rilpivirine and are associated with a risk of Torsade de Pointes [Warnings and Precautions (5.4) ] . Where possible, consider alternatives, such as azithromycin, which increases rilpivirine concentrations less than other macrolides Narcotic Analgesics: methadone * ↓ R(-) methadone ↓ S(+) methadone No dose adjustments are required when initiating coadministration of methadone with rilpivirine tablets. However, clinical monitoring is recommended as methadone maintenance therapy may need to be adjusted in some patients.

Proton Pump

Inhibitors: e.g., esomeprazole lansoprazole omeprazole pantoprazole rabeprazole ↓ rilpivirine Coadministration is contraindicated with rilpivirine tablets [see Contraindications (4) ] In addition to the drugs included in Table 6, the interaction between rilpivirine tablets and the following drugs was evaluated in clinical studies and no dose adjustment is needed for either drug [see Clinical Pharmacology ( 12.3 )] : acetaminophen, atorvastatin, chlorzoxazone, cabotegravir, ethinylestradiol, norethindrone, raltegravir, sildenafil, simeprevir and tenofovir disoproxil fumarate. Rilpivirine did not have a clinically significant effect on the pharmacokinetics of digoxin or metformin. No clinically relevant drug-drug interaction is expected when rilpivirine tablets are coadministered with maraviroc, ribavirin or the NRTIs abacavir, emtricitabine, lamivudine, stavudine and zidovudine. QT Prolonging Drugs There is limited information available on the potential for a pharmacodynamic interaction between rilpivirine and drugs that prolong the QTc interval of the electrocardiogram. In a study of healthy subjects, 75 mg once daily and 300 mg once daily (3 times and 12 times the dose in rilpivirine tablets) have been shown to prolong the QTc interval of the electrocardiogram [see Clinical Pharmacology ( 12.2 )] . Consider alternatives to rilpivirine tablets when coadministered with a drug with a known risk of torsade de pointes. Consider alternatives to rilpivirine tablets when coadministered with drugs with a known risk of torsade de pointes. ( 5 . 4 ) Rilpivirine tablets should not be used in combination with NNRTIs. ( 4 , 7 ) Coadministration of rilpivirine tablets with drugs that induce or inhibit CYP3A may affect the plasma concentrations of rilpivirine. ( 4 , 7 ) Coadministration of rilpivirine tablets with drugs that increase gastric pH may decrease plasma concentrations of rilpivirine. ( 4 , 7 ) Refer to the Full Prescribing Information for other drugs that should not be coadministered with rilpivirine tablets and for other drugs that may require a change in dose or regimen. ( 7 )

EDURANT and EDURANT PED are contraindicated for coadministration with the drugs in Table 2 for which significant decreases in rilpivirine plasma concentrations may occur due to CYP3A enzyme induction or gastric pH increase, which may result in loss of virologic response and possible resistance to EDURANT or EDURANT PED or to the class of NNRTIs [see Drug Interactions (7) and Clinical Pharmacology (12.3) ] .

Table

2: Drugs That are Contraindicated with EDURANT and EDURANT PED Drug Class Contraindicated Drugs in Class Clinical Comment Anticonvulsants Carbamazepine Oxcarbazepine Phenobarbital Phenytoin Potential for significant decreases in rilpivirine plasma concentrations due to CYP3A enzyme induction, which may result in loss of virologic response.

Antimycobacterials Rifampin Rifapentine

Glucocorticoid (systemic) Dexamethasone (more than a single-dose treatment)

Herbal

Products St. John's wort ( Hypericum perforatum )

Proton Pump

Inhibitors e.g., Esomeprazole Lansoprazole Omeprazole Pantoprazole Rabeprazole Potential for significant decreases in rilpivirine plasma concentrations due to gastric pH increase, which may result in loss of virologic response. Coadministration of EDURANT or EDURANT PED is contraindicated with drugs where significant decreases in rilpivirine plasma concentrations may occur, which may result in loss of virologic response and possible resistance and cross-resistance. ( 4 )

AND PRECAUTIONS Skin and Hypersensitivity Reactions: Severe skin and hypersensitivity reactions have been reported during postmarketing experience, including cases of Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS), with rilpivirine-containing regimens. Immediately discontinue treatment if hypersensitivity or rash with systemic symptoms or elevations in hepatic serum biochemistries develop and closely monitor clinical status, including hepatic serum biochemistries. ( 5.1 ) Hepatotoxicity: Hepatic adverse events have been reported in patients with underlying liver disease, including hepatitis B or C virus co-infection, or in patients with elevated baseline transaminases. A few cases of hepatotoxicity have occurred in patients with no pre-existing hepatic disease. Monitor liver function tests before and during treatment with EDURANT or EDURANT PED in patients with underlying hepatic disease, such as hepatitis B or C virus co-infection, or marked elevations in transaminase. Also consider monitoring liver functions tests in patients without pre-existing hepatic dysfunction or other risk factors. ( 5.2 )

Depressive

Disorders: Severe depressive disorders have been reported. Immediate medical evaluation is recommended for severe depressive disorders. ( 5.3 ) Patients may develop immune reconstitution syndrome. ( 5.5 )

5.1 Skin and Hypersensitivity Reactions Severe skin and hypersensitivity reactions have been reported during the postmarketing experience, including cases of Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS), with rilpivirine-containing regimens. While some skin reactions were accompanied by constitutional symptoms such as fever, other skin reactions were associated with organ dysfunctions, including elevations in hepatic serum biochemistries. During the Phase 3 clinical trials, treatment-related rashes with at least Grade 2 severity were reported in 3% of subjects receiving EDURANT.

No Grade

4 rash was reported. Overall, most rashes were Grade 1 or 2 and occurred in the first four to six weeks of therapy [see Adverse Reactions (6.1 and 6.2) ] . Discontinue EDURANT or EDURANT PED immediately if signs or symptoms of severe skin or hypersensitivity reactions develop, including but not limited to, severe rash or rash accompanied by fever, blisters, mucosal involvement, conjunctivitis, facial edema, angioedema, hepatitis or eosinophilia. Clinical status including laboratory parameters should be monitored and appropriate therapy should be initiated.

5.2 Hepatotoxicity Hepatic adverse events have been reported in patients receiving a rilpivirine-containing regimen. Patients with underlying hepatitis B or C virus infection, or marked elevations in transaminases prior to treatment may be at increased risk for worsening or development of transaminase elevations with use of EDURANT or EDURANT PED. A few cases of hepatic toxicity have been reported in adult patients receiving a rilpivirine-containing regimen who had no pre-existing hepatic disease or other identifiable risk factors. Appropriate laboratory testing prior to initiating therapy and monitoring for hepatotoxicity during therapy with EDURANT or EDURANT PED is recommended in patients with underlying hepatic disease such as hepatitis B or C virus infection, or in patients with marked elevations in transaminases prior to treatment initiation. Liver enzyme monitoring should also be considered for patients without pre-existing hepatic dysfunction or other risk factors.

5.3 Depressive Disorders The adverse reaction depressive disorders (depressed mood, depression, dysphoria, major depression, mood altered, negative thoughts, suicide attempt, suicidal ideation) has been reported with EDURANT. Patients with severe depressive symptoms should seek immediate medical evaluation to assess the possibility that the symptoms are related to EDURANT or EDURANT PED, and if so, to determine whether the risks of continued therapy outweigh the benefits. During the Phase 3 trials in adults (N=1368) through 96 weeks, the incidence of depressive disorders (regardless of causality, severity) reported among EDURANT (n=686) or efavirenz (n=682) was 9% and 8%, respectively. Most events were mild or moderate in severity. The incidence of Grade 3 and 4 depressive disorders (regardless of causality) was 1% for both EDURANT and efavirenz. The incidence of discontinuation due to depressive disorders among EDURANT or efavirenz was 1% in each arm. Suicidal ideation was reported in 4 subjects in each arm while suicide attempt was reported in 2 subjects in the EDURANT arm. During the Phase 2 trial in pediatric subjects 12 to less than 18 years of age (N=36) receiving EDURANT through 48 weeks, the incidence of depressive disorders (regardless of causality, severity) was 19.4% (7/36). Most events were mild or moderate in severity. The incidence of Grade 3 and 4 depressive disorders (regardless of causality) was 5.6% (2/36). None of the subjects discontinued due to depressive disorders. Suicidal ideation and suicide attempt were reported in 1 subject.

5.4 Risk of Adverse Reactions or Loss of Virologic Response Due to Drug Interactions The concomitant use of EDURANT or EDURANT PED and other drugs may result in potentially significant drug interactions, some of which may lead to <span class="opacity-50 text-xs">[see Dosage and Administration (2.7) , Contraindications (4) , and Drug Interactions (7) ]</span> : Loss of therapeutic effect of EDURANT or EDURANT PED and possible development of resistance. In healthy subjects, 75 mg once daily and 300 mg once daily (3 times and 12 times the dose in EDURANT) have been shown to prolong the QTc interval of the electrocardiogram. Consider alternatives to EDURANT or EDURANT PED when coadministered with a drug that is known to have a risk of torsade de pointes <span class="opacity-50 text-xs">[see Drug Interactions (7) and Clinical Pharmacology (12.2) ]</span> .

See Table

6 for steps to prevent or manage these possible and known significant drug interactions, including dosing recommendations. Consider the potential for drug interactions prior to and during EDURANT or EDURANT PED therapy and review concomitant medications during therapy.

5.5 Immune Reconstitution Syndrome Immune reconstitution syndrome has been reported in patients treated with combination antiretroviral therapy, including EDURANT. During the initial phase of combination antiretroviral treatment, patients whose immune system responds may develop an inflammatory response to indolent or residual opportunistic infections (such as Mycobacterium avium infection, cytomegalovirus, Pneumocystis jirovecii pneumonia or tuberculosis), which may necessitate further evaluation and treatment. Autoimmune disorders (such as Graves&apos; disease, polymyositis, Guillain-Barré syndrome, and autoimmune hepatitis) have also been reported to occur in the setting of immune reconstitution; however, the time to onset is more variable, and can occur many months after initiation of treatment.

5.6 Different Formulations Are Not Substitutable EDURANT and EDURANT PED have differing pharmacokinetic profiles and are not substitutable on a milligram-per-milligram basis. A difference in bioavailability between 1 × 25 mg film-coated tablet and 10 × 2.5 mg tablets for oral suspension was observed; therefore, they are not substitutable <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.3) ]</span>. When a pediatric patient weighs 25 kg or greater, they must switch from EDURANT PED tablets for oral suspension to one 25 mg EDURANT tablet daily <span class="opacity-50 text-xs">[see Dosage and Administration (2.3) ]</span>. Incorrect dosing of a given formulation may result in underdosing and loss of therapeutic effect and possible development of resistance or possible clinically significant adverse reactions from greater exposure to rilpivirine.