Cimetidine and Emtricitabine, rilpivirine, and tenofovir interaction
Cimetidine and Emtricitabine, rilpivirine, and tenofovir: the Emtricitabine, rilpivirine, and tenofovir prescribing label flags this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Emtricitabine, rilpivirine, and tenofovir (COMPLERA) label · effective 2025-07-16
Use of RPV with proton pump inhibitors is contraindicated and use of RPV with H 2 -receptor antagonists requires staggered administration [see Contraindications (4) and Clinical Pharmacology (12.3) ] .
Drugs Inducing or Inhibiting CYP3A Enzymes Rilpivirine is primarily metabolized by cytochrome P450 (CYP) 3A, and drugs that induce or inhibit CYP3A may thus affect the clearance of RPV [see Contraindications (4) , Warnings and Precautions (5.7) , and Clinical Pharmacology (12.3) ] .
Coadministration of RPV and drugs that inhibit CYP3A may result in increased plasma concentrations of RPV.
H 2 -Receptor Antagonists: cimetidine famotidine nizatidine ranitidine ↔ RPV , (famotidine taken 12 hours before RPV or 4 hours after RPV) ↓ RPV , (famotidine taken 2 hours before RPV) Administer H 2 -receptor antagonists at least 12 hours before or at least 4 hours after COMPLERA.
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.