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There is a potential for cardiac risk of sexual activity in patients with preexisting cardiovascular disease. Therefore, treatments for erectile dysfunction, including Viagra, should not be generally used in men for whom sexual activity is inadvisable because of their underlying cardiovascular status. The evaluation of erectile dysfunction should include a determination of potential underlying causes and the identification of appropriate treatment following a complete medical assessment.Similar to nitrates, alpha-blockers improve blood flow. This class of drug helps to keep blood vessels relaxed and open. Alpha-blockers can be used to treat high blood pressure. Because they help relax other parts of the body, they can also be used to help urine flow in men with prostate cancer. All three ED medications can further lower blood pressure if used with alpha-blockers. The National Institutes of Health (NIH) urges caution if using PDE-5 inhibitors along with alpha-blockers. levitra professional 20 mg Cialis was studied in the general ED population in 7 randomized, multicenter, double-blinded, placebo-controlled, parallel-arm design, primary efficacy and safety studies of 12-weeks duration. Two of these studies were conducted in the United States and 5 were conducted in centers outside the US. Additional efficacy and safety studies were performed in ED patients with diabetes mellitus and in patients who developed ED status post bilateral nerve-sparing radical prostatectomy.Levitra (vardenafil hydrochloride) is administered orally for the treatment of erectile dysfunction. This monohydrochloride salt of vardenafil is a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5).

?Faced with the reality that UK-92480 was not a viable angina treatment, Pfizer took an interest instead in its unintended effects. As a treatment for erectile dysfunction, UK-92480 was much more effective than a placebo. In 1998, the drug was approved for this use by the Food and Drug Administration (FDA), and it was rechristened Viagra. (N=576) Tadalafil 5 mg

Cardiovascular: angina pectoris, AV block, migraine, syncope, tachycardia, palpitation, hypotension, postural hypotension, myocardial ischemia, cerebral thrombosis, cardiac arrest, heart failure, abnormal electrocardiogram, cardiomyopathy. viagra without perscription 54 users found this comment helpful. Did you? Yes No Report as inappropriate

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do i need viagra If you think you have used too much of this medicine seek emergency medical attention right away. The symptoms of overdose usually include chest pain, nausea, irregular heartbeat, and feeling light-headed or fainting.Viagra contains sildenafil, which is the same medicine found in another drug called REVATIO. REVATIO is used to treat a rare disease called pulmonary arterial hypertension (PAH). Viagra should not be used with REVATIO or with other PAH treatments containing sildenafil or any other PDE5 inhibitors (such as Adcirca [tadalafil]).

H2 Antagonists (e.g. Nizatidine) — An increase in gastric pH resulting from administration of nizatidine had no significant effect on pharmacokinetics.