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buy propecia propecia online How does an erection normally occur? When you are sexually aroused, messages from your brain travel down nerves to your penis. Chemicals called neurotransmitters are then released from the ends of the nerves in the penis. Stimulation of the penis can also cause local nerve endings to release neurotransmitter chemicals. How Common Is Erectile Dysfunction? Failure to achieve an erection less than 20% of the time is not unusual and treatment is rarely needed. Failure to achieve an erection more than 50% of the time, however, generally indicates there is a problem requiring treatment. PSA levels: PSA (prostate specific antigen) blood levels and prostate examination to exclude prostate cancer is important before starting testosterone treatment since testosterone can aggravate prostate cancer. generic viagra online viagra propecia online store What Doctors Treat ED? The type of medical specialist who treats ED will depend on the cause of the problem. Based on your family's medical history as well as your own medical history and current health, your doctor may treat you with oral medications such as Viagra or similar drugs. If this fails, he or she may refer you to a urologist or psychologist. cialis from european online drugstores buy cialis Is the patient taking medications that can contribute to erectile dysfunction? Does Insurance Cover ED Treatment? Insurance coverage of ED depends upon the type of treatment prescribed. If there is a documented medical condition that is shown to be causing ED, insurance will usually cover at least some of it. Sex therapy and medications that have not yet been approved by the FDA, however, are generally not covered. Talk to your insurance provider to determine if the treatment you are considering will be covered. Liver enzymes and liver function tests: Advanced liver disease (cirrhosis) can result in hormonal imbalance and gonad dysfunction leading to low testosterone levels. Thus, evaluation for liver disease may be necessary in cases of erectile dysfunction.