her. them. why let erectile dysfunction get in your way? talk to your doctor about viagra. ask if your heart is healthy enough for sex. do not take viagra if you take nitrates for est pain; it may cause an unsafe drop in blood pressure. side effects include adache, flushing, upset stomach, and abnormal vision. to avoid long-term injury, seek immediate medical help for an erection lastg more than four hours. stop taking vira and call youroctor right away if you experience a sudden decase or los