Promethazine Interactions

CYP2D6 inhibitor that increases haloperidol plasma concentrations; monitor for increased adverse effects including QTc prolongation.

Source: NLP:haloperidol decanoate

CYP2D6 inhibitor that increases haloperidol plasma concentrations, raising risk of adverse events including QTc prolongation.

Source: NLP:haloperidol lactate

Co-administration resulted in 15% decrease in maximal zaleplon plasma concentrations with no change in AUC. Pharmacodynamics not evaluated; caution advised.

Source: NLP:zaleplon