Tamsulosin can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert. You may feel dizzy when getting up from a sitting or lying position. Avoid standing up too quickly to keep from falling.
Avoid drinking alcohol. It may increase dizziness caused by tamsulosin.
Before taking tamsulosin, tell your doctor if you are allergic to sulfa drugs. You may also be allergic to tamsulosin.
Tamsulosin can affect the pupils of your eyes during cataract surgery. If you have cataract surgery during your treatment with tamsulosin, tell the surgeon ahead of time that you are using this medication. Do not stop using tamsulosin before surgery unless your surgeon tells you to.
Stop using tamsulosin and call your doctor at once if you feel like you might pass out, or if you have an erection of your penis that is painful or lasts longer than 4 hours.