Some people may also have ringing in their ears tinnitus or dizziness. Your healthcare provider can help you determine the right dosage for you. Viagra is always taken as needed, usually an hour before having sex. Ozempic, Viagra and the life-changing drugs that were created for something else Miranda Levy Posted: November 9, Last updated: November 9, For the second time this week, a drug that was invented to treat one condition has been given the green light for something else. Emling S. Privacy: Confirm that your personal data and payment details are confidential.Vision changes. Muscle pain. But there are some differences. With Viagra, there is a higher risk of vision changes than with Cialis. Among people who take Viagra or sildenafil, 3% get blue vision that lasts a few hours. On the other hand, Cialis has a slightly higher risk of muscle pain than Viagra and vardenafil. Headache, flushing, and upset stomach are common Viagra side effects. These effects are usually mild and often resolve on their own. While rare, Viagra can cause an erection that lasts longer than 4 hours (priapism). This can result in permanent damage if left untreated. Vision changes are also possible.  · Save with one of our top Viagra Coupons for November Up to 50% Off. Discover 3 tested and verified Viagra Discounts, courtesy of Groupon. FREE Shipping with $ Purchase | FREE Returns. Air-inclusive Trips Beach Premium Family Fun International & Tours Under $