What side effects may I notice from receiving Tamsulosin?

Side effects that you should report to your doctor or health care professional as soon as possible:
-allergic reactions like skin rash or itching, hives, swelling of the lips, mouth, tongue, or throat
-breathing problems
-change in vision
-feeling faint or lightheaded
-irregular heartbeat
-prolonged or painful erection
-weakness

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
-back pain
-change in sex drive or performance
-constipation, nausea or vomiting
-cough
-drowsy
-runny or stuffy nose
-trouble sleeping

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