The information provided is for educational purposes only and is not intended to replace discussions with a healthcare provider. Protein binding is independent of total drug concentrations. 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. This can happen if you are sick with fever, diarrhea, or vomiting; sweat a lot; or do not drink enough liquids. Men with untreated ED had relatively low baseline scores for all aspects of sexual function measured again using a 5-point scale in the IIEF. Some medications should not be taken with sildenafil.Does the price of sildenafil vary based on strength or what it’s prescribed for? The price you’ll pay for sildenafil may vary based on the strength and form of the drug your doctor prescribes for. No membership fees. The Savings Offer and Program expire on 12/31/ For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS Eligible patients may save on their VIAGRA® (sildenafil citrate) prescription with the VIAGRA savings card. Viagra costs around $60–$70 per tablet. Generic sildenafil can range from $2–$18 per pill, depending on the manufacturer and dose. Who makes generic Viagra?