Product CharacteristicsViagra (sildenafil) works by inhibiting the chemical phosphodiesterase, which leads to an increase in the effect of nitric oxide. Nitric oxide allows the smooth muscles inside the penis to relax, promoting more blood flow to the area during sexual arousal or stimulation. Nitric oxide also opens the blood vessels throughout the body, which can cause decreased blood pressure. This decrease in blood pressure may increase the effects of blood-pressure lowering drugs, especially alpha-blockers, such as terazosin (Hytrin), doxazosin (Cardura), and prazosin (Minipress). Patients with cardiovascular disease could have additional side effects from Viagra, especially in combination with sexual activity. Other common side effects of Viagra include warmth or redness in your face, neck, or chest; stuffy nose; headache; upset stomach; and back pain. More serious, but less frequent side effects include prolonged erection lasting more than 4 hours, vision changes, and loss of hearing. If these occur, you should contact your health care provider. viagra free trial 4) Ben Affleck: All the way back in 1999, the Armageddon heartthrob admitted to trying the drug with some very serious side effects. "I almost had a heart attack. I had to sit down, and all it did was make me sweat and feel dizzy and really unnerved," he told Playboy magazine. "I felt no sexual side effects whatsoever." He even went on to call it one of his "biggest disappointments."Sildenafil citrate is a white to off-white crystalline powder with a solubility of 3.5 mg/mL in water and a molecular weight of 666.7.
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