Coadministration with erythromycin has not been studied.  Increased exposure of rilpivirine is expected due to inhibition of CYP3A enzymes. Where possible, alternatives such as azithromycin should be considered. There is limited information available on the potential for a pharmacodynamic interaction between rilpivirine and medicinal products that prolong the QTc interval of the ECG. In a study of healthy subjects, supratherapeutic doses of rilpivirine (75 mg once daily and 300 mg once daily) have been shown to prolong the QTc interval of the electrocardiogram (ECG). Rilpivirine at the recommended dose of 25 mg once daily is not associated with a clinically relevant effect on QTc. Rilpivirine should be used with caution when co-administered with medicinal products with a known risk of Torsade de Pointes.

Concomitant use of rilpivirine with erythromycin may cause an increase in the plasma concentrations of rilpivirine (inhibition of CYP3A enzymes). Where possible, alternatives such as azithromycin should be considered. 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 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 rilpivirine when coadministered with a drug that is known to have a risk of torsade de pointes.