Viagra, the brand name for sildenafil citrate, is a medication primarily used to treat erectile dysfunction (ED) in men. It works by increasing blood flow to the penis, facilitating an erection when sexually stimulated. The active ingredient, sildenafil, inhibits a specific enzyme called phosphodiesterase-5 (PDE5), allowing for the relaxation of blood vessels.
Mechanism of Action
Sildenafil’s effect is targeted. It doesn’t directly cause erections; sexual stimulation remains necessary. The increased blood flow resulting from PDE5 inhibition allows for the engorgement of the penis’s erectile tissues, producing a firmer erection.
Important Considerations
Viagra is a prescription medication. Consult a doctor before use, as it may interact with other medications, particularly nitrates. Common side effects include headache, facial flushing, and indigestion. Rare but serious side effects may occur; seek immediate medical attention if experiencing vision changes or chest pain.
