Testosterone Replacement Therapy (TRT) is meant to be taken long term. If you start taking it, and then decide to stop, you will lose all the benefits you gained from taking it. In most cases, your body will eventually start producing its own testosterone again and you will return to your baseline. However, the higher the dose you’re on, and the longer the duration of time on that dose, the longer it will take your body to adjust. You will likely feel terrible for a while, especially after getting used to “optimized levels.”