Fildena 100 mg works by inhibiting phosphodiesterase type 5 (PDE5), an enzyme that regulates blood flow in the penis. By blocking PDE5, sildenafil helps relax the blood vessels in the penis, which increases blood flow and helps achieve and maintain an erection in response to sexual stimulation. Rare but serious side effects can include priapism (a prolonged and painful erection), sudden vision loss, or hearing loss.

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