Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. These medicines are called PDE5 inhibitors. These include itraconazole Sporanox, Tolsura , ketoconazole Extina, Ketozole, others and ritonavir Norvir. The most common side effects of VIAGRA: 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. Oral medicines for ED usually work well and cause few side effects. It works for up to 36 hours.Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or . How Does Viagra® Work? March 22, The little blue pill Viagra® is today universally recognized, but that wasn’t always so. Viagra was developed in the . The Savings Offer and Program expire on 12/31/ For further information, call , visit test1.ru, or write: Viatris Inc., P.O. Box , Mission, KS .

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