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In clinical studies, a skin reaction at the application site was the most common side effect that was reported with Testim. Problems that were also reported in up to 1 percent of people using the medication included insomnia, headaches, and breast development. While most side effects of this drug are minor, you should seek medical attention immediately if you experience depression, vomiting, or sleep apnea.
As with any medicine, side effects are possible with Testim® (testosterone gel). However, not everyone who uses the medication will have problems. In fact, most people tolerate it quite well. If side effects do occur, in most cases, they are minor and either require no treatment or can easily be treated by you or your healthcare provider.
(This article covers many, but not all, of the possible side effects with Testim. Your healthcare provider can discuss a more complete list of Testim side effects with you.)
Testim has been studied thoroughly in clinical trials. In these studies, the side effects that occurred in a group of people using Testim were documented and compared to side effects that occurred in a similar group of people using a placebo (a gel with no active ingredients). This way, it is possible to see what side effects occurred, how often they appeared, and how they compare to the group taking the placebo.
In these studies, the most common Testim side effects included skin reaction at the application site. This side effect occurred in up to 4 percent of people. Other common side effects (all occurring in up to 1 percent of people) included:
- High blood pressure
- Breast development
- Hot flashes
- Watery eyes
- Mood swings
- Changes in the sense of smell
- Taste changes
- Spontaneous penile erections.