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Oral testosterone can reduce ED in some men with low levels of natural testosterone, but it is often ineffective and may cause liver damage. Patients also have claimed that other oral drugs—including yohimbine hydrochloride, dopamine and serotonin agonists, and trazodone—are effective, but the results of scientific studies to substantiate these claims have been inconsistent. Improvements observed following use of these drugs may be examples of the placebo effect, that is, a change that results simply from the patient's believing that an improvement will occur. Thyroid function test: One of the thyroid hormones' functions is to regulate the production of sex hormones, and a deficiency in these hormones may contribute to or cause ED. Safety concerns and adverse effects have been studied carefully. The most common adverse effects are headaches and upper GI distress. These are not usually severe and are self-limited when the drug is stopped. Sildenafil is a mild inhibitor of phosphodiesterase type 6, which is found in the retina. This inhibition is manifested by a blue haze at the periphery of the field of vision but is not dangerous. Very few patients have stopped taking sildenafil because of this effect. this drugstore sells viagra without prescription viagra no prescription Q. If implants work so well, why aren't they recommended first? How to buy Viagra and get free samples canadian pharmacy viagra for sale online looking for cheap viagra online? generic viagra online without prescription To inflate the prosthesis, the man presses on the pump. The pump transfers fluid from the reservoir to the cylinders in the penis, inflating them and causing an erection. Pressing on a deflation valve at the base of the pump returns the fluid to the reservoir, deflating the penis and returning it to the normal flaccid state.