It may be difficult to remain firm despite wanting to have sex. It’s available in 50 mg, mg, and mg tablets. 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. Other conditions that may disqualify you from an ED prescription include a history of stroke, kidney or liver disease, cancer, diabetes, or a bleeding disorder. In some cases, ED can cause a strain on relationships and impact self-esteem. ED medications can cause side effects, and it’s crucial to have access to a medical provider if needed. You should also call your insurance company to see if they cover erectile dysfunction medications.Compare prices and print coupons for Viagra (Sildenafil) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $ Find the best sildenafil citrate or viagra prices near you now with our cost comparison tool and start saving today. QTY 30 • MG • Tablet • Near EDIT; Add to Medicine . Cart. Transfer your prescription for Sildenafil (Generic for Viagra, Oral Tablet) on Amazon Pharmacy. FREE SHIPPING for Prime members.