Valif 20 mg works by blocking the enzyme phosphodiesterase type 5 (PDE5). Normally, this enzyme breaks down cyclic guanosine monophosphate (cGMP), a chemical responsible for relaxing smooth muscles in blood vessels. When PDE5 is blocked, cGMP levels stay higher for longer, allowing increased blood flow into the penile tissue and supporting a stronger erection during physical arousal.
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