RETesto Injection is a combination medicine used in the treatment of male hypogonadism. It increases testosterone levels in adult men and helps improve various health problems, including impotence, infertility, low sex drive, tiredness, and depression. RETesto Injection is given by a doctor or a nurse. You should not self-administer this medicine at home. Use it regularly to get the maximum benefit from the medicine. It may take some time for the medicine to be effective. The course of the treatment should be completed for better efficacy of the medicine.Use of this medicine may cause a few common side effects, such as an increase in red blood cell count and hemoglobin in the blood. Some people may also experience allergic reactions such as itching, rashes, and swelling of the lips or face. If you experience any of these side effects, consult your doctor without delay. Your doctor may help you with ways to prevent or reduce the side effects.This medicine may not be suitable for everybody. Before using the medicine, you should let your doctor know if you have any problems with your heart, liver, or kidneys. Also, let your doctor know of all the other medicines you are taking.