What special precautions should I follow?  

Before taking phenoxybenzamine,

• tell your doctor and pharmacist if you are allergic to phenoxybenzamine or any other drugs.
• tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially medications for diet control, high blood pressure, asthma, cough, colds, allergies, and glaucoma; and vitamins.
• tell your doctor if you have or have ever had heart or kidney disease, a stroke, or transient ischemic attacks (TIA).
• tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking phenoxybenzamine, call your doctor immediately.
• if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking phenoxybenzamine.
• you should know that this drug may make you drowsy. Do not drive a car or operate machinery until you know how this drug affects you.
• remember that alcohol can add to the drowsiness caused by this drug.

What should I do if I forget a dose?     

Take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.