New Study: Testosterone Treatment is Definitely Effective

A new study offers the first clear evidence that testosterone treatment for men 65 years and older can improve mood and sex drive.

The results, published in a paper in the New England Journal of Medicine, are from the first three of seven trials in a long-term study called the Testosterone Trials, or the TTrials. The studies are testing the effect of testosterone gel compared with placebo, and changes in sexual function, vitality, mood, physical function, walking speed, and walking distance.

Researchers found that testosterone treatment increased the blood testosterone level in the men 65 and older to levels comparable to mid-normal for young men. Testosterone also improved all aspects of sexual function, including sexual activity, sexual desire, and the ability to get an erection.

Testosterone treatment did not significantly improve distance walked in six minutes when only men enrolled in the physical function trial were considered, but did increase the distance walked when all men in the TTrials were considered. The treatment did not improve energy, but did improve mood and depressive symptoms.

“The results of the TTrials show for the first time that testosterone treatment of older men who have unequivocally low testosterone levels does have some benefit,” says Peter J. Snyder, a professor at the University of Pennsylvania and lead author and principal investigator of the TTrials. “However, decisions about testosterone treatment for these men also will depend on the results of the other four trials … and the risks of testosterone treatment.”

In 2003, the Institute of Medicine reported that there was insufficient evidence to support any beneficial effect of testosterone in such men. This report was the impetus for TTrials, which are now the largest trials to examine the efficacy of testosterone treatment in men 65 and older whose testosterone levels are low due seemingly to age alone.

“Previous testosterone trials in older men yielded equivocal and inconsistent results,” says Jane A. Cauley, a professor at the University of Pittsburgh and study coauthor. “We showed that testosterone improved men’s impression that their sexual function and walking ability had improved, suggesting that these effects are clinically important.”

But is it safe? Continue reading to learn what the researchers found…

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