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Enlarged prostate treatment may worsen erectile dysfunction

08 July 2015, 09:10

Men with benign prostate enlargement who used finasteride (also known as Proscar and Propecia) to treat their condition, experienced worsening erectile dysfunction (ED) that did not resolve with continued treatment. In addition, they experienced a reduction in their testosterone levels leading to hypogonadism (little to no production of sex hormones). However, men who used tamsulosin (Flomax) experienced none of these adverse side effects.

The findings, currently available online in the journal Hormone Molecular Biology and Clinical Investigation, were led by researcher from Boston University School of Medicine (BUSM).

Considerable controversy exists regarding the severity and persistence of the adverse effects of 5α reductase inhibitors (5α-RIs) such as finasteride. Many investigators believe that the adverse effects on sexual function affects only a small proportion of treated patients and such adverse effects are thought to resolve with continuing treatment.

The researchers studied 470 men who were treated with finasteride and 230 men who received the alpha blocker tamsulosin for their BPH. Both groups were followed for 45 months and were assessed for improvement of BPH symptoms. Prostate specific antigen and testosterone levels were also measured. The effects of the drugs on the quality of life were assessed by the Aging Male Symptom scale while the effects of the drugs on erectile function were assessed by the International Index of Erectile Function.

Read Also: How cycling can cause erectile dysfunction

The researchers found that the men treated with finasteride experienced marked and significant gradual decrease in their erectile function and had significant and progressive decline in total testosterone levels while those on the tamsulosin therapy did not.

According to the researchers both of these drugs have been proven useful in treatment of lower urinary tract symptoms related to BPH. "However, 5α reductase inhibitors exert undesirable sexual side effects and, in some cases, these effects are persistent," explained corresponding author Abdulmaged M. Traish, MBA, PhD, professor of biochemistry and urology at BUSM. "Since sexual function is considered an integral part of overall health, it is important that physicians are aware of the adverse side effects of this class of drugs on human health in general and on sexual function in particular. Our study emphasized that the effect on erectile function is a serious concern and needs to be considered more carefully."

Funding for this study was provided by the Department of Urology, Boston University School of Medicine.

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