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. No side effects were reported in sexual partners. The information provided is for educational purposes only and is not intended to replace discussions with a healthcare provider. But, some side effects, including flushing, heartburn, sinus congestion, and headaches, might prevent some men from taking them even though they work well. If you prefer, you may contact the U. Clinical trials for MED found minimal side effects. If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help.According to price-comparison site , generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s compared with more than $ Most popular Safeway $ retail Save 94% $ Get free savings Low price Walgreens $ retail Save 94% $ Get free savings directions Closest store Rite Aid. Optum Store Sildenafil If you are experiencing the symptoms of erectile dysfunction (ED), you may have considered using Viagra or a similar ED medication as a possible treatment. But if.