As with any medication, Penegra 50 mg may cause side effects, including headache, flushing, nasal congestion, indigestion, and back pain. Serious side effects are rare but can include priapism (a prolonged and painful erection lasting more than four hours), sudden vision loss, or hearing loss. If you experience any adverse effects while taking Penegra 50 mg, it's essential to consult your healthcare provider. https://www.genericday.com/penegra-50-mg.html