You should not use propranolol if you have asthma, very slow heart beats, or a serious heart condition such as "sick sinus syndrome" or "AV block" (unless you have a pacemaker).

How should I take propranolol?

Take propranolol exactly as prescribed by your doctor. Follow all directions on your prescription label. Your doctor may occasionally change your dose to make sure you get the best results. Do not take this medicine in larger or smaller amounts or for longer than recommended.

What happens if I miss a dose?

For regular (short-acting) propranolol: Take the missed dose as soon as you remember. Skip the missed dose if your next dose is less than 4 hours away.
For extended-release propranolol (Inderal LA, InnoPran XL and others): Take the missed dose as soon as you remember. Skip the missed dose if your next dose is less than 8 hours away.
Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
Overdose symptoms may include slow or uneven heartbeats, dizziness, weakness, or fainting.

What should I avoid while taking propranolol?

Avoid drinking alcohol. It may increase your blood levels of propranolol.
Avoid getting up too fast from a sitting or lying position, or you may feel dizzy. Get up slowly and steady yourself to prevent a fall.