Priapism warning: This drug can cause priapism, which is an erection that won’t go away. If you have an erection that lasts more than 4 hours, call 911 or go to the nearest emergency room. If it’s not treated right away, this condition can cause permanent damage to your penis.Your doctor may start you on a lowered dosage of sildenafil. This can

This information is not a substitute for medical advice. Always speak with your doctor or pharmacist about dosages that are right for you.Increased side effects can include low blood pressure, dizziness, or vision problems. They can also include erections that last longer than normal.For people with sickle cell anemia: This drug may cause a common