Thoughts should be examined and moderated. Rarely reported side effects include: an erection that will not go away priapism. Professional assistance can help patients to manage severe stress. It is important to tell your doctor about any heart problems you have now or may have had in the past. If you prefer, you may contact the U. Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. To use the oral liquid: Shake the bottle well for at least 10 seconds before each use.Oral medications that are in use are sildenafil (Viagra), vardenafil hydrochloride (Levitra) and tadalafil (Cialis). Other oral medicines are undergoing tests for safety and efficacy. . Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements. VIAGRA may affect the way other medicines work, and other medicines may affect the way VIAGRA works, causing side effects. Especially tell your healthcare provider if you take any of the following. Examples of Viagra’s more commonly reported side effects include: headache. flushing (temporary warmth, redness, or deepening of skin color) stuffy nose. indigestion (upset stomach) mild vision.