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    If you've been diagnosed with an abnormally low T, testosterone replacement therapy (TRT) offers a lot of benefits. But there are risks, too.

    Here's what you need to know before you start TRT.

    Can testosterone replacement therapy make me feel more energetic?

    If you have an abnormally low T, boosting your testosterone levels with TRT can help bring your energy levels back to normal. It can also restore your sex drive.

    You may notice a drop in body fat and a buildup of muscle mass after TRT.

    Are there risks to testosterone replacement therapy?

    Yes. TRT has side effects, which may include:

    Should I avoid testosterone replacement therapy if I have certain conditions?

    Guidelines from the Endocrine Society say you should not have TRT if you have prostate cancer or breast cancer.

    But some studies suggest that men who have been successfully treated for prostate cancer may be candidates for TRT as long as they are closely watched for signs of disease. Before starting TRT, your doctor should assess your risk for prostate cancer.

    You might be told by a doctor not to get TRT if you have these conditions, which may be made worse by TRT:

    TRT is also not advised to be used for treating those with low testosterone caused by aging.

    Can testosterone replacement therapy treat ED?

    If you have low testosterone, TRT may help restore your ability to have healthy erections and can boost your sex drive.

    But ED has many other possible causes. Low testosterone may not be the whole story behind your ED. Talk to your doctor to determine what's at the root of your erection problems.

    How do I take testosterone replacement therapy?

    TRT comes in several different forms. Each has pros and cons.