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There may be other brand names for this medicine.
You should not use this medicine if you have had an allergic reaction to efavirenz, emtricitabine, tenofovir, Emtriva®, Sustiva®, Truvada®, or Viread®. You should not use this medicine if you are pregnant or if you are also using any medicine that contains lamivudine (such as Combivir®, Epivir®, Epivir-HBV®, Epzicom?, Trizivir®). You should not use this medicine if you are using adefovir (Hepsera®), bepridil (Vascor®), cisapride (Propulsid®), midazolam (Versed®), pimozide (Orap®), triazolam (Halcion®), voriconazole (Vfend®), St. John's wort, or ergotamine medicines (such as dihydroergotamine, ergonovine, ergotamine, methylergonovine, Cafergot®, Ergomar®, or Wigraine®).