Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction) by blocking a certain enzyme (phosphodiesterase-PDE5) in the body. In combination with sexual stimulation, sildenafil works by helping the blood flow into the penis to achieve and maintain an erection.
This drug does not protect against sexually transmitted diseases (such as HIV, hepatitis B,...
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Source: HealthCentral Encyclopedia
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