Before taking haloperidol,
tell your doctor and pharmacist if you are allergic to haloperidol or any other medications.
tell your doctor and pharmacist what prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: amiodarone (Cordarone); anticoagulants (blood thinners); antihistamines; disopyramide (Norpace); dofetilide (Tikosyn); epinephrine (Epipen); erythromycin (E.E.S., E-Mycin, Erythrocin); ipratropium (Atrovent); lithium (Eskalith, Lithobid); medications for anxiety, depression, irritable bowel disease, mental illness, motion sickness, Parkinson's disease,seizures, ulcers, or urinary problems; methyldopa; moxifloxacin (Avelox); narcotic medications for pain; pimozide (Orap); procainamide ; quinidine ; rifampin (Rifater, Rifadin); sedatives; sotalol (Betapace, Betapace AF); sparfloxacin (Zagam) (not available in the US); sleeping pills; thioridazine; and tranquilizers. Your doctor may need to change the doses of your medications or monitor you carefully for side effects.
tell your doctor if you have or have ever had Parkinson's disease (PD; a disorder of the nervous system that causes difficulties with movement, muscle control, and balance). Your doctor will probably tell you not to take haloperidol.
tell your doctor if you or anyone in your family has or has ever had prolonged QT syndrome (condition that increases the risk of developing an irregular heartbeat that may cause loss of consciousness, or sudden death). Also tell your doctor if you have or have ever had breast cancer; bipolar disorder (condition that causes episodes of depression, episodes of mania, and other abnormal moods); citrullinemia (condition that causes build-up of ammonia in the blood); an abnormal electroencephalogram (EEG; a test that records electrical activity in the brain); seizures; an irregular heartbeat; low levels of calcium or magnesium in your blood; trouble keeping your balance; chest pain; or heart or thyroid disease. Also tell your doctor if you have ever had to stop taking a medication for mental illness due to severe side effects.
tell your doctor if you are pregnant, especially if you are in the last few months of your pregnancy, or if you plan to become pregnant or are breast-feeding. If you become pregnant while taking haloperidol, call your doctor. Haloperidol may cause problems in newborns following delivery if it is taken during the last months of pregnancy.
if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking haloperidol.
you should know that this medication may make you drowsy and may affect your thinking and movements. Do not drive a car or operate machinery until you know how this medication affects you.
ask your doctor about the safe use of alcohol during your treatment with haloperidol. Alcohol can make the side effects of haloperidol worse.
you should know that haloperidol may cause dizziness, lightheadedness, and fainting when you get up too quickly from a lying position. To avoid this problem, get out of bed slowly, resting your feet on the floor for a few minutes before standing up.