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Sildenafil is a selective inhibitor of cyclic guanosine monophosphate (cGMP), an enzyme that is involved in the regulation of blood flow in tissues and organs. The drug acts on the enzyme phosphodiesterase type 5 (PDE 5), which destroys cgmp, and thereby contributes to vasodilation and improved blood flow.
Sildenafil is used to treat erectile dysfunction in men. It helps to achieve and maintain the erection necessary for sexual intercourse. The drug is not hormonal and does not affect the level of testosterone in the body.
Sildenafil can cause side effects such as headache, dizziness, blood rush to the face, nasal congestion, dyspepsia. In case of adverse reactions, it is necessary to consult a doctor.