WebViagra side effects. Viagra may cause some unwanted side effects. Side effects may include: sensitivity to light. muscle aches. heartburn. nose bleeding. flushed skin. .Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Leukemia blood related cancer or Multiple myeloma blood related cancer or Sickle-cell anemia blood disorder —Sildenafil should be used with caution in these patients as problems with prolonged erection of the penis may occur. Rarely reported side effects include: an erection that will not go away priapism. Adults 65 years of age and older—25 mg as a single dose no more than once a day, 1 hour before sexual intercourse. To use the oral liquid: Shake the bottle well for at least 10 seconds before each use.WebUses. Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, sildenafil works by increasing . WebViagra vs Cialis? About 75 to 85 percent of the time both Viagra and Cialis are effective drugs for erectile dysfunction. Take sildenafil at least 30 minutes, but no more than 4 hours, before sexual activity (1 hour before is the most effective). Do not take more than once daily. A high-fat meal may delay how quickly the drug begins to work. WebSep 27, · Taking Viagra can cause mild or serious side effects. Mild effects may go away in a few days or a couple of weeks. These side effects can include: headache; flushing; indigestion;.Leukemia blood related cancer or Multiple myeloma blood related cancer or Sickle-cell anemia blood disorder —Sildenafil should be used with caution in these patients as problems with prolonged erection of the penis may occur. Call your doctor right away if you have blurred vision, confusion, dizziness, faintness, or lightheadedness when getting up from a lying or sitting position suddenly, sweating, or unusual tiredness or weakness. Do not take other medicines unless they have been discussed with your doctor. Your doctor may adjust your dose if needed. We rely on peer-reviewed studies, academic research institutions, and medical associations. Draft or Dr. You’ll soon start receiving the latest Mayo Clinic health information you requested in your inbox.