Brand Viagra contains sildenafil citrate, the same active ingredient found in generic versions. Sildenafil works by relaxing blood vessels in the penis, increasing blood flow and facilitating an erection.
How Sildenafil Citrate Works
Sildenafil inhibits a specific enzyme called phosphodiesterase-5 (PDE5). This enzyme typically breaks down cyclic GMP, a molecule crucial for achieving and maintaining an erection. By blocking PDE5, sildenafil allows cyclic GMP levels to remain high, resulting in improved blood flow to the penis.
Important Considerations
Brand Viagra is a prescription medication. Consult your doctor before use to discuss potential side effects and interactions with other medications. Follow your doctor’s instructions carefully regarding dosage and frequency. Do not exceed the recommended dose.


