Like other medications for ED, Malegra can cause side effects, including headache, flushing, indigestion, nasal congestion, dizziness, and vision changes. In rare cases, it may also cause more serious side effects such as 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 Malegra, it's important to seek medical attention promptly.