Testosterone Undecanoate Injection usually works after 1 to 2 weeks. Testosterone Undecanoate Injection is used for male hypogonadism. If it is found in a blood test that testosterone levels are reduced, it may cause a decrease in male libido, which can be improved by injecting Testosterone Undecanoate Injections, which will help to replenish testosterone levels in the male body, and it will usually work after about 1~2 weeks. However, it is important to note that after testosterone injections, there may be adverse reactions such as equivocal hirsuteness, acne, increased appetite, and weight gain. Injections of the drug are prohibited if you suffer from prostate cancer: use with caution in patients with kidney disease, heart disease and high blood pressure who have a tendency to edema. After injecting testosterone, it is necessary to make a good examination in time to avoid adverse reactions and to carry out standardized treatment in time. The drug should be applied under medical supervision.