Testosterone therapy helps men with impotence problems due to low levels of the hormone, but the therapy is of no use to those with ejaculation disorders, a new study finds.

Estimates indicate between 10 percent and 18 percent of men have ejaculation dysfunction, a term that includes the inability to ejaculate, decreased volume, force, or delayed time in ejaculation.

This is a separate condition from erectile dysfunction (ED) and there is no FDA treatment for it.

Researchers conducted an experiment in which 76 men with ejaculation dysfunction who also had clinically low levels of testosterone received either a 2 percent solution of the hormone applied on the skin or a placebo.

To gauge ejaculatory function, researchers collected semen samples and had participants complete sexual health questionnaires.

Although the men who received testosterone replacement therapy had higher scores on the questionnaire than the men who took the placebo, the difference was too small to be statistically significant. The researchers also found no or little improvement in ejaculate volume or orgasmic function.

The study was published in Endocrine Society’s Journal of Clinical Endocrinology & Metabolism.