You must see your physician regularly. While taking Tamsulosin, you must have regular checkups. Follow your physician's advice about when to have these checkups. You may feel drowsy or dizzy. Do not drive, use machinery, or do anything that requires mental alertness until you know how Tamsulosin affects you. To reduce the risk of dizzy or fainting spells, do not sit or stand up quickly. If you begin to feel dizzy, sit down until you feel better. Avoid alcoholic drinks; they can make you more drowsy, increase flushing, and cause rapid heartbeats. Take Tamsulosin at bedtime to lessen the effects of drowsiness and dizziness, but be careful if you have to get up during the night. Drowsiness and dizziness are more likely to occur after the first dose, after an increase in dose, or during hot weather or exercise. These effects can decrease once your body adjusts to this medicine. Although extremely rare in men taking Tamsulosin, contact you health care provider immediately if you experience prolonged and painful erection of the penis which is unrelated to sexual activity (priapism). If not brought to immediate medical attention, priapism can lead to permanent erectile dysfunction (impotence). If you are going to have surgery, tell your prescriber or health care professional that you are taking Tamsulosin.