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Start a discussion Tell your doctor if you have or have had any of the following medical conditions:In 2000, participants were asked to rate their ability before 1986, in 1986 to 1989, 1990 to 1994, and 1995 to 2000, and during the past 3 months to have and maintain an erection adequate for intercourse without treatment (very poor, poor, fair, good, or very good). Men with poor or very poor ability at or before 2000 were considered to have ED in 2000 (baseline).18,19 The high validity of a single assessment of ED has been indicated elsewhere (eMethod 1 in the Supplement).18

Do not use the drug amyl nitrite (sometimes called "poppers") while you are taking Viagra.4. sildenafil generic The effect on one of the major end points, maintenance of erections after penetration, is shown in Figure 6, for the pooled results of 5 fixed-dose, dose-response studies of greater than one month duration, showing response according to baseline function. Results with all doses have been pooled, but scores showed greater improvement at the 50 and 100 mg doses than at 25 mg. The pattern of responses was similar for the other principal question, the ability to achieve an erection sufficient for intercourse. The titration studies, in which most patients received 100 mg, showed similar results. Figure 6 shows that regardless of the baseline levels of function, subsequent function in patients treated with Viagra was better than that seen in patients treated with placebo. At the same time, on-treatment function was better in treated patients who were less impaired at baseline. redness of the skinFlushing 1% 1% 3%

viagra girls Tadalafil, sildenafil, and vardenafil all act by inhibiting the PDE5 enzyme. These drugs also inhibit other PDE enzymes. Sildenafil and vardenafil inhibit PDE6, an enzyme found in the eye, more than tadalafil.[7] Some sildenafil users see a bluish tinge and have a heightened sensitivity to light because of PDE6 inhibition.[8] Sildenafil and vardenafil also inhibit PDE1 more than tadalafil.[7] PDE1 is found in the brain, heart, and vascular smooth muscle.[7] It is thought that the inhibition of PDE1 by sildenafil and vardenafil leads to vasodilation, flushing, and tachycardia.[7] Tadalafil inhibits PDE11 more than sildenafil or vardenafil.[7] PDE11 is expressed in skeletal muscle, the prostate, the liver, the kidney, the pituitary gland, and the testes.[7] The effects on the body of inhibiting PDE11 are not known.[7]

Patients who have suffered a myocardial infarction, stroke, or life-threatening arrhythmia within the last 6 months;Unfortunately, Viagra is a medication known to cause quite a few side effects, some of them quite serious. What is encouraging, however, is the fact that most people suffer from only the least serious side effects of Sildenafil, which include flushing, nasal congestion, minor vision and metabolism impairments. Severe side effects are observed in extremely rare cases and may include heart attack or stroke, sudden hearing loss, priapism and arrhythmia. If you experience any symptoms of the latter after taking Viagra, seek emergency medical assistance immediately.

viagra how does it work 2.5 mg tablets debossed with “C 2 1/2”Viagra (sildenafil) belongs to a class of medications, known as phosphodiesterase inhibitors, which are indicated for the treatment of erectile dysfunction in men. Other phosphodiesterase inhibitors include Levitra (vardenafil) and Cialis (tadalafil). These medications are not necessarily different types of Viagra, but treatment alternatives. Viagra, commonly referred to as the "little blue pill" was the first erectile dysfunction medication to be approved by the U.S. Food and Drug Administration (FDA). By inhibiting phosphodiesterase, Viagra enhances the effect of nitric oxide allowing for smooth muscle relaxation and increasing blood flow to specific areas of the body in the presence of sexual arousal or stimulation. Viagra exhibits no therapeutic responses in the absence of sexual stimulation. Possible side effects associated with treatment with Viagra include flushed skin, nausea or abdominal pain, congestion in the nose, diarrhea, vision clouded with a blue tint, headache and digestive problems.There have been rare reports of prolonged erections greater than 4 hours and priapism (painful erections greater than 6 hours in duration) for this class of compounds. Priapism, if not treated promptly, can result in irreversible damage to the erectile tissue. Physicians should advise patients who have an erection lasting greater than 4 hours, whether painful or not, to seek emergency medical attention.

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