What side effects may I notice from receiving Terazosin?

Side effects that you should report to your doctor or health care professional as soon as possible:

-blurred vision
-difficulty breathing, shortness of breath
-fainting spells, light headedness
-fast or irregular heartbeat, palpitations or chest pain
-males: prolonged or painful erection
-swelling of the legs and ankles
-unusually weak or tired
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-headache
-nausea
-nasal stuffiness

This list may not describe all possible side effects for Terazosin. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.