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Viagra (sildenafil) is an erectile dysfunction treatment medicine. Its effects are based on dilating the veins in the tissues of the penis allowing more blood to flow in. At the same time this medicine prevents the blood from escaping back into the body too soon, which allows the patient to complete sexual intercourse. Viagra is available in tablets of 25, 50 and 100 mg. At first you are most likely to be prescribed 25 mg of sildenafil, but if this dose is not working well for you it may be adjusted by your doctor. It’s important to visit your health care provider before purchasing Viagra to make sure you will benefit from the treatment.

Specific medical conditions your doctor must know about include diabetes, high blood pressure, coronary artery disease, depression and peripheral vascular disease. Viagra can cause some minor side effects, including dizziness, headache, facial flushing, diarrhea, nasal congestion and indigestion. Very rare side effects of Viagra include high blood pressure, heart attack, irregular heart rhythms and a stroke. These side effects are most likely to occur during or right after you have sex, or in people who had cardiovascular risk factors before experiencing these side effects.