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. However, others work on a cash-pay basis and don’t partner with insurance companies. People with heart conditions should never take ED medications without consulting a doctor. Patients should always ask their doctors for medical advice about adverse events. Finally, we checked customer reviews to better understand user experiences with each platform. Stendra avanafil : This is an as-needed medication taken 30 minutes before sex and can last up to six hours. Erectile dysfunction medications require a prescription from a licensed provider. · Viagra comes as an oral tablet that contains the active drug sildenafil. Sildenafil is also available in generic form. Viagra is classified as a phosphodiesterase type 5 (PDE5) inhibitor. According to price-comparison site , generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s . Viagra Coupons, Prices, and Savings Card. Generic Names: Sildenafil Citrate. Brand Names: Revatio. Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). Learn more about Viagra oral. 1. This is a generic drug. Even if this drug is covered by Medicare or your insurance, we recommend you compare prices.