Fildena 100 mg is a medication containing sildenafil citrate, a drug used primarily to treat erectile dysfunction (ED). Sildenafil citrate works by increasing blood flow to the penis during sexual stimulation, thus helping to achieve and maintain an erection. As with any medication, Fildena 100 mg may cause side effects. Common side effects may include headache, flushing, indigestion, nasal congestion, dizziness, and changes in vision. In rare cases, sildenafil citrate can cause more serious side effects such as priapism (a prolonged and painful erection lasting more than four hours), sudden vision loss, or hearing loss.

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