Drugs That React With Efavirenz
Efavirenz Interactions Explained
The following sections explain in detail the potentially negative interactions that can occur when efavirenz is combined with any of the drugs listed above.
Bepridil and efavirenz should not be taken together, due to the risk of serious or life-threatening reactions, such as an irregular heart rhythm (arrhythmia).
Efavirenz can decrease the level of bupropion in your blood, perhaps making it less effective. Your healthcare provider may need to increase your bupropion dosage to account for this interaction, although the normal maximum recommended dosage of bupropion should not be exceeded.
Certain Antibiotics or Antifungals
Combining efavirenz with certain antibiotics or antifungals may increase the risk of side effects of efavirenz (due to increased blood levels of efavirenz) or decrease the level of the antibiotic or antifungal in the blood (making it less effective). If you take efavirenz with an antibiotic or antifungal medication, your healthcare provider may need to adjust the dose of both of the medications.
Efavirenz can increase the level of certain benzodiazepine medications in the blood, increasing the risk of side effects. With two of these medications (midazolam and triazolam), this interaction is so severe that they should never be taken with efavirenz.
Certain Seizure Medications