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Viagra is a PDE5 inhibitor that stimulates erections and causes people to maintain a steady erection for a good period of about 4 hours. If erections last more than 4 hours, you should call your doctor. The erection-inducing ability lasts for less duration than comparable drugs like Cialis, but the erection-inducing ability is more guaranteed than Ciails. Viagra should not be taken if nitrates for chest pain are being taken as this can cause a heart attack or other problems. The chemical name for Viagra is Sildenafil citrate, and it is also sold as Viagra or Revatio. It is also recommended for the treatment of pulmonary arterial hyptertension. The pharmaceutical industry, Pfizer, the titan mega heavyweight of the pharmaceutical industry, sells it.
Cialis and Levitra are its main competitors, but it was the first on the scene, and, thus, it was the most well-known. Its uses are varied and include sexual dysfunction, pulmonary hyptertension, altitude sickness, and use in sports because it widens the blood vessels and enhances athletic performance. It has also been used recreationally because it has made such a mark on popular culture. Some people think that it increases libido or enhances sexual experience. Some people take it in conjunction with other drugs because those drugs have an erection-blunting effect like MDMA, stimulants, and opiates, and Viagra will counteract their negative sexual side effects and enable lots of sexual pleasure to occur without worrying about the other drugs hampering it. buy cialis online
Contraindicatoins for Viagra include nitric oxide donors, nitrites, and nitrates, people with decreased liver function, and people with decreased renal function. Side effects included were mild and included headache, flushing, dyspepsia, and nasal congestion among others like impaired vision, photophobia, and blurred vision in some instances. Clinical trials showed that most side effects were mild.