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Viagra helps to increase blood flow to the penis so that a man can get and keep an erection. It is also used to treat pulmonary arterial hypertension (PAH), a type of high blood pressure that affects the heart and lungs. Common side effects of Viagra include headache, facial flushing, indigestion, stuffy or runny nose, and dizziness. It works by increasing blood flow to the penis and helping men maintain an erection.

Sildenafil is available in three doses