How VIAGRA works

VIAGRA enables many men with ED to respond to sexual stimulation. When a man is sexually aroused, the arteries in the penis relax and widen, allowing more blood to flow into the penis. As the arteries in the penis expand and harden, the veins that normally carry blood away from the penis become compressed, restricting the blood flow out of the penis. With more blood flowing in and less flowing out, the penis enlarges, resulting in an erection.

If the nerves or blood vessels associated with this process aren't working properly, a man may not be able to get an erection. VIAGRA increases blood flow to the penis, so that when a man is sexually aroused, he can get and keep an erection. When the sexual encounter is over, the erection goes away.

VIAGRA is indicated for the treatment of erectile dysfunction (ED).

Remember that no medicine is for everyone. Only your physician can prescribe VIAGRA for you. If you use nitrate drugs, often used to control chest pain (also known as angina), don’t take VIAGRA. This combination could cause your blood pressure to drop to an unsafe or life-threatening level. Be sure to ask your doctor if your heart is healthy enough for sexual activity.