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Herbal medicines usually do not have significant side effects when used appropriately and at suggested doses. Occasionally, an herb at the prescribed dose causes stomach upset or a headache. This may reflect the purity of the preparation or added ingredients, such as synthetic binders or fillers. For this reason, it is recommended that only high-quality products be used. As with all medications, more is not better and overdosing can lead to serious illness and death. MONDAY, May 12 (HealthDay News) -- Patients with Duchenne muscular dystrophy often suffer from heart failure, but Viagra might prevent or delay the onset of this condition, a new Canadian study finds. generic viagra here canadian pharmacy viagra Effectiveness of tadalafil in these studies was assessed using a sexual function questionnaire. Study participants also were asked if they were able to achieve vaginal penetration and to maintain erections long enough for successful intercourse. As with all bodily functions, erections depend on signals from the brain that say when to start and when to stop. The inability to get an erection can sometimes result from a problem with the nerves carrying signals from the brain to the penis. Penile pain (11 to 32 percent) and minor urethral discomfort are the most common reported adverse effects of transurethral administration, with dizziness (2 percent) and symptomatic hypotension (3 percent) being the most serious.16 As with transcavernosal alprostadil, the transurethral form of the drug is contraindicated in patients with an abnormally formed penis, those having conditions that predispose them to priapism, those with a known hypersensitivity to alprostadil and those who have been advised for medical reasons to avoid sexual intercourse. Because it is a smooth muscle relaxant, transurethral alprostadil should not be used during sexual intercourse with a pregnant woman.16