Viagra side effects
As with all medication, side effects may occur. The side effects most commonly associated with Viagra® include headaches, flushing, upset stomach, abnormal vision, runny or stuffy nose, muscle and back pain, nausea, dizziness, and rash. As always, if you have questions or any side effects that bother you or linger, talk with our medical professionals and we will advise accordingly. If you have an erection that lasts longer than 4 hours, get medical help immediately.