The risk of QT prolongation may be increased if you have certain medical conditions or are taking other drugs that may cause QT prolongation. Turn to your doctor or pharmacist for more details. Doxepin should not be used by pregnant/nursing women or children as well as by the patients having demonstrated a reaction of hypersensitivity to Doxepin. This risk may increase if you use certain drugs (such as diuretics/"water pills") or if you have conditions such as severe sweating, diarrhea, or vomiting. Alcohol or marijuana can make you more dizzy or drowsy. Report any new or worsening symptoms right away. Keep all drugs away from reach of children and pets.