Generally, side effects of suhagra 50 mg do not last long and pass quickly. Do not take two doses at once and do not increase the dose without consulting a doctor. Otherwise, unpleasant and serious side effects can occur. The most common side effects of honeymoon are headache, flushing of face and stomach upset. Some patients may experience sudden loss of vision or a slight loss of vision or sensitivity to light while taking Suhagra. There are cases when the erection lasts more than four hours.