How quickly does propranolol work for performance anxiety, and how long does it last?

Immediate-release propranolol is often prescribed ahead of a specific event rather than at the exact moment symptoms begin. It may start affecting physical symptoms within about an hour, with effects lasting several hours. Results vary. Your physician should give you timing instructions for your specific prescription.

The formulation matters. Extended-release propranolol releases medicine over a longer period and is not interchangeable with immediate-release dosing instructions. Check your label and ask your pharmacist if you are unsure which form you received.

You may notice less shaking or a slower heartbeat without feeling mentally calmer. Results vary. Propranolol does not directly treat anxious thoughts. The amount of worry you feel is not a reliable way to decide whether another dose is safe.

Do not repeat a dose sooner than prescribed or take extra medicine to cover a longer event. Ask your physician what to do if an event is delayed or lasts longer than expected. If the prescribed plan does not meet your needs, request a review rather than changing it yourself.