Propranolol is a beta-blocker. This means that it blocks the receptor sites for Adrenaline, and it is commonly prescribed to control high blood pressure, (hypertension).
Adrenaline is often described as the; fight or flight neurotransmitter, that is to say that "fear," such as stage fright can cause the body to release large amounts of Adrenaline into the blood stream. Whilst this action is useful when trying to prepare for a fight, or flee a dangerous situation, it can become inhibitory when giving a presentation, or taking an exam etc.
By blocking this "fear spiral" of Adrenaline, Propranolol helps the individual to stay calm and in control of the situation.
To help lower blood pressure and remain calm, 20mg to 40mg can be taken approximately 1-hour before the "feared" event. The dose may be repeated later in the day if required, however we do not recommend more than 80mg daily unless under a physician's supervision.
Those who are diabetic, or have existing heart, kidney or liver disorders should consult with your physician first, before use.
http://www.antiaging-systems.com/a2z/propranolol.htm
hmm..maybe we could try this..