Viagra.

Viagra (sildenafil citrate) can be prescribed for men diagnosed with erectile dysfunction and unable to have sex without this kind of assistance. Viagra is classified as a PDE5 inhibitor – it works by inhibiting the activity of a specific enzyme in your body responsible for making the blood leave the tissues of the penis. Therefore, by opening up your arteries Viagra helps you to get an erection faster, maintain it for longer and complete sexual intercourse in spite of your age and health condition. Such mild side effects as stuffy nose, backache, headache, and muscle ache are possible at the beginning of your treatment. Make sure you always watch them carefully to see if they go away or change in intensity. In the second case report them to your health care provider. If you are feeling light-headed, have chest pain, sudden hearing loss, sweating, nausea, general ill feeling, swelling in your hands, irregular heartbeat, sudden vision loss, shortness of breath, ringing in your ears, or vision changes, make sure your doctor is notified, as those are dangerous side effects of Viagra that require immediate medical attention.