DRUG INTERACTIONS: Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.Some products that may interact with this drug include: alpha blockers (such as prazosin), anticholinergic/antispasmodic drugs (such as atropine, dicyclomine, scopolamine), drugs that increase the amount of dopamine in your body (such as cabergoline, levodopa, pergolide, ropinirole), lithium, guanethidine, warfarin.Other medications can affect the removal of chlorpromazine from your body, which may affect how chlorpromazine works. Examples include pindolol, propranolol, drugs to treat seizures (such as carbamazepine, phenobarbital, phenytoin), among others.Many drugs besides chlorpromazine may affect the heart rhythm (QT prolongation), including amiodarone, dofetilide, pimozide, procainamide, quinidine, sotalol, macrolide antibiotics (such as erythromycin), among others. Therefore, before using chlorpromazine, report all medications you are currently using to your doctor or pharmacist.Tell your doctor or pharmacist if you are taking other products that cause drowsiness or may slow your breathing including alcohol, antihistamines (such as cetirizine, diphenhydramine), drugs for sleep or anxiety (such as alprazolam, diazepam, zolpidem), muscle relaxants, and narcotic pain relievers (such as codeine).Check the labels on all your medicines (such as allergy or cough-and-cold products) because they may contain ingredients that cause drowsiness. Ask your pharmacist about using those products safely.Also report the use of drugs that might increase seizure risk when combined with chlorpromazine, such as isoniazid (INH), theophylline, tramadol, or tricyclic antidepressants (such as amitriptyline), among others. Consult your doctor or pharmacist for details.This medication may interfere with certain laboratory tests (including certain pregnancy tests, phenylketonuria tests), possibly causing false test results. Make sure laboratory personnel and all your doctors know you use this drug.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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