Haldol can cause a serious heart problem. Your risk may be higher if you also use certain other medicines for infections, asthma, heart problems, high blood pressure, depression, mental illness, cancer, malaria, or HIV.
Using Haldol with other drugs that make you drowsy can worsen this effect. Ask your doctor before using opioid medication, a sleeping pill, a muscle relaxer, or medicine for anxiety or seizures.
Tell your doctor about all your other medicines, especially:
lithium;
rifampin;
medicine to treat Parkinson's disease;
seizure medicine; or
a blood thinner--warfarin, Coumadin, Jantoven.
This list is not complete. Other drugs may affect Haldol, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.
 Haldol drug interactions (more detail)
