An inherited eye disease that affects the retina. Viagra may lead to decrease or loss in eyesight with one or both eyes. In the rare event you have a painful or prolonged erection lasting 4 or more hours, stop using this drug and get medical help right away, or permanent problems could occur. Drug Interactions Drug interactions may change how your medications work or increase your risk for serious side effects. If Viagra does not work for first one or two times, try again on some other day. Learn how we develop our content. Viagra should be taken approximately 30 to 60 minutes before engaging in sexual activity.If you do buy medicines over the internet: Check to see if an online pharmacy is legitimate. Never order medicines from an online pharmacy that doesn’t list Missing: canada. What about medications like Viagra® (sildenafil)? These medications (which also include tadalafil [Cialis ®] and vardenafil [Levitra ® ]) help men who can’t get an erection . These sites tell you they will save you the “embarrassment” of talking to your doctor about certain prescription drugs, such as Viagra, or drugs to prevent hair loss, or promote .

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