Sildenafil citrate is sold as Viagra by the pharmaceutical company Pfizer. It is used as an impotence treatment. It works by relaxing the muscles and increasing the flow of blood in specific areas of the body. The active ingredient of this drug is sildenafil citrate. Its results depend on the strength of the dosage and other factors such as changes in lifestyle, healthy diet, and exercise.

Who should stay away from Viagra?

If you are using a citrate drug for treatment of heart problems or chest pain, do not use it. Citrate drugs include Nitro-Bid, Nitrolingual pump spray, Dilatrate-SR, Imdur, Monoket and ISMO. Nitrates are found in many recreational drugs such as poppers. If you take this blue pill with any citrate drug, you will experience a sudden decrease in blood pressure, heart attack, or fainting. If you feel nauseated during sexual activity, call your doctor immediately. You should take Viagra dosage only as prescribed by the doctor.