Testosterone injections are a form of medication that are administered intramuscularly, meaning they are injected directly into a muscle. The most common areas for injection are the gluteus muscle (buttocks) and the thigh muscle. It is crucial to clean the injection site with an alcohol swab to decrease the risk of infection before administering the injection. The medication should be at room temperature before the injection. To give the injection, insert the needle at a 90-degree angle using the thumb and index finger, slowly push the plunger to inject the medication, and remove the needle and apply gentle pressure to the injection site with a sterile gauze pad or cotton ball to prevent bleeding. Follow the instructions provided by the healthcare provider as the dose and frequency of injection will vary depending on the individual's testosterone level and the reason for treatment. Additionally, it's important to note that testosterone replacement therapy should only be done under close supervision of a healthcare provider, as it can have serious side effects if not used properly.