Patients should talk to their doctor or pharmacist if they have heart problems, stroke in the past six months, kidney disease, liver disease, high or low blood pressure, a severe loss of body water, history of painful/prolonged erection, conditions that may increase the risk of painful/prolonged erection (such as sickle cell anemia, leukemia, multiple myeloma), and eye problems.
Generic drugs approved by FDA have the same high-quality and strength as brand-name drugs. The generic manufacturing and packaging sites must pass the same quality standards as those of brand-name drugs.