Men with erectile dysfunction can be treated with the prescription drug fildena 25. It functions by boosting penile blood flow. An inhibitor of phosphodiesterase-5 is sildenafil. It functions by causing your penis’ blood arteries to relax, which increases blood flow to the area during sexual stimulation. Depending on the individual, the effects of Fildena 25 usually persist for four to six hours after the prescription is taken. Frequent adverse reactions could include flushing, upset stomach, headache, and dizziness. Although they are uncommon, more severe side effects like visual problems or hearing loss can happen.