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The effectiveness of Enzyte is in dispute. Some medical professionals in fact advise against taking Enzyte, saying that it can lead to damage. The Center for Science in the Public Interest have urged the Federal Trade Commission to disallow further television advertising for Enzyte due to a lack of proper studies supporting claims. Enzyte maker Berkeley Premium Nutraceuticals, Inc., is currently under a class action lawsuit for false advertising. free samples viagra generic viagra online without prescription It is normal for a man to have five to six erections during sleep, especially during rapid eye movement (REM). Their absence may indicate a problem with nerve function or blood supply in the penis. There are two methods for measuring changes in penile rigidity and circumference during nocturnal erection: snap gauge and strain gauge. A significant proportion of men who have no sexual dysfunction nonetheless do not have regular nocturnal erections. Thus presence of NPT tends to signify physically functional systems, but absence of NPT may be ambiguous and not rule out either cause. Some authors advocate measuring prolactin and free testosterone levels as part of the initial evaluation.4,5 The value of this routine testing is uncertain, however, because the incidence of endocrinopathy presenting as erectile dysfunction is reportedly only 2 percent.8 A reasonable strategy is to obtain a free testosterone level in all men aged 50 and older and in those younger than 50 who have symptoms or signs of hypogonadism such as decreased libido, bilateral testicular atrophy or a reduced amount of body hair.9 The prolactin level should be measured if the free testosterone level is low, the patient has a substantial loss of libido or a prolactinoma is suspected on the basis of a history of headache with visual field cuts.10 Measurement of luteinizing hormone levels can be reserved for use in distinguishing primary from secondary hypogonadism in men with low testosterone levels.9 Back pain and muscle aches occurred in less than 7% of patients, and usually occurred at 12 to 24 hours after taking tadalafil. The back pain and muscle aches associated with tadalafil were characterized by mild to moderate muscle discomfort in the lower back, buttocks and thighs, often aggravated by lying down. The back and muscle aches resolved in most patients without treatment within 48 hours. When treatment was necessary, acetaminophen (Tylenol) and non-steroidal antiinflammatory drugs (NSAIDs) such as Motrin, Advil, or Aleve were effective. Approximately 0.5% of all the patients using tadalafil discontinued the drug due to back pain or muscle aches. 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.