See also How to Use section.
Your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor or pharmacist first.
This drug should not be used with the following medication because very serious interactions may occur: thioridazine.
If you are currently using this medication, tell your doctor or pharmacist before starting propranolol.
Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of: alpha blockers (e.g., prazosin), aluminum hydroxide, anticholinergics (e.g., atropine, scopolamine), calcium channel blockers (e.g., diltiazem, verapamil), chlorpromazine, diazepam, drugs affecting liver enzymes that remove propranolol from your body (such as cimetidine, St. John's wort, certain SSRI antidepressants including fluoxetine/paroxetine/fluvoxamine, HIV protease inhibitors including ritonavir, rifamycins including rifabutin, certain anti-seizure medicines including carbamazepine), other drugs to treat high blood pressure (e.g., clonidine, hydralazine, methyldopa, reserpine), epinephrine, fingolimod, haloperidol, other heart medications (e.g., amiodarone, digoxin, disopyramide, propafenone, quinidine), MAO inhibitors (isocarboxazid, linezolid, methylene blue, moclobemide, phenelzine, procarbazine, rasagiline, selegiline, tranylcypromine), mefloquine, rizatriptan, theophylline, thyroid hormones (e.g., levothyroxine), tricyclic antidepressants (e.g., amitriptyline), warfarin.
Check the labels on all your medicines (such as cough-and-cold products, diet aids, or NSAIDs such as ibuprofen, naproxen) because they may contain ingredients that could increase your heart rate or blood pressure. Ask your pharmacist for more details.
This medication may interfere with certain laboratory tests (including glaucoma screening test, cardiovascular stress testing using arbutamine), possibly causing false test results. Make sure laboratory personnel and all your doctors know you use this drug.
This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.