Viagra, or sildenafil, primarily works by inhibiting phosphodiesterase-5 (PDE5), an enzyme that breaks down cyclic GMP. Increased cyclic GMP relaxes the smooth muscles in the blood vessels of the penis.
This relaxation allows increased blood flow into the penis, leading to an erection when stimulated sexually. The effect is targeted; Viagra doesn’t cause erections without sexual stimulation.
Importantly, the drug’s effectiveness depends on a patient’s individual physiological response and other factors. It’s crucial to consult a doctor before using Viagra to address any concerns.
Note that Viagra’s effects generally last for about four hours. Its onset of action varies, but typically begins within 30-60 minutes after ingestion.
Side effects can occur, though they’re not experienced by everyone. Common ones include headaches, flushing, nasal congestion, and visual disturbances. Your doctor can explain potential risks in detail.
Viagra is a prescription medication, and it’s never advisable to obtain it from unofficial sources. Always obtain this and any other medication only from trusted pharmacies or through your physician.
