-cimetidine
-fluoxetine
-ketoconazole
-medicines for erectile disfunction like sildenafil, tadalafil, vardenafil
-medicines for high blood pressure
-other alpha-blockers like alfuzosin, doxazosin, phentolamine, phenoxybenzamine, prazosin, terazosin
-warfarin

They need to know if you have any of the following conditions:
-advanced kidney disease
-advanced liver disease
-low blood pressure
-prostate cancer
-an unusual or allergic reaction to tamsulosin, sulfa drugs, other medicines, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

Visit your doctor or health care professional for regular check ups. You will need lab work done before you start this medicine and regularly while you are taking it. Check your blood pressure as directed. Ask your health care professional what your blood pressure should be, and when you should contact him or her.

This medicine may make you feel dizzy or lightheaded. This is more likely to happen after the first dose, after an increase in dose, or during hot weather or exercise. Drinking alcohol and taking some medicines can make this worse. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not sit or stand up quickly. If you begin to feel dizzy, sit down until you feel better. These effects can decrease once your body adjusts to the medicine.

Contact your doctor or health care professional right away if you have an erection that lasts longer than 4 hours or if it becomes painful. This may be a sign of a serious problem and must be treated right away to prevent permanent damage.

If you are thinking of having cataract surgery, tell your eye surgeon that you have taken this medicine.

Keep out of the reach of children.

Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Throw away any unused medicine after the expiration date.