Are allergic to sildenafil, as contained in VIAGRA and Revatio®, or any with the components in VIAGRA The commonest Unwanted effects of VIAGRA: headache; flushing; upset stomach; abnormal eyesight, like alterations in colour vision (such as possessing a blue shade tinge) and blurred vision; stuffy or runny nose; back again https://elliottpygnr.blue-blogs.com/42763309/considerations-to-know-about-adult-dating