Do not take XSTRONG if you: Discuss your health with your doctor to ensure that you are healthy enough for sex. If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help. XSTRONG can cause serious side effects. Rarely reported side effects include: Before you take XSTRONG, tell your healthcare provider if you: Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements. XSTRONG may affect the way other medicines work, and other medicines may affect the way XSTRONG works, causing side effects. Especially tell your healthcare provider if you take any of the following: XSTRONG does not protect against sexually transmitted diseases, including HIV. The most common side effects of XSTRONG: headache; flushing; upset stomach; abnormal vision, such as changes in color vision (such as having a blue color tinge) and blurred vision; stuffy or runny nose; back pain; muscle pain; nausea; dizziness; rash.
XSTRONG (sildenafil citrate) is prescription medicine used to treat erectile dysfunction (ED). XSTRONG is not for women or children.