Fildena 25 mg contains sildenafil, a medicine used to treat erectile dysfunction. If it causes an erection that lasts too long, the main concern is priapism, a prolonged erection that can damage penile tissue. What you should do If the erection lasts 4 hours or longer: Go to an emergency department immediately, even if it is painless. If it is painful, very rigid, or worsening: Seek emergency care Fildena 25 mg do not wait until 4 hours have passed. Do not take more Fildena, Silagra, Tadasoft, or other erectile-dysfunction medicines. Combining them can increase the risk of complications. Do not try to force the erection to go away by taking other medicines or using ice directly on the penis. Do not delay medical care to try home remedies. A prolonged erection can cause permanent damage if treatment is delayed. nhs.uk +1 Please tell me: Is the erection happening right now, and how long has it lasted so far — less than 1 hour, 1–3 hours, or 4 hours or more? If it has reached 4 hours, seek emergency care immediately rather than waiting for my reply.