Intramuscular injection is a method of operation that focuses on injecting medication through a syringe into the muscle tissue for therapeutic purposes. Clinically, before performing intramuscular injection, it is necessary to communicate with the patient in order to obtain cooperation and prepare the relevant supplies. Then help the patient to take the appropriate position, use iodine or alcohol to disinfect the local skin, wait for drying, after exhausting the air in the syringe to carry on the extraction of drugs. After finding the location of intramuscular injection, fix the needle plug with the middle finger, stab the needle into the muscle quickly and then pump the piston, if there is no phenomenon of blood return, then the drug can be injected into the muscle, and then pull out the needle, and carry on the local brief pressure, so as to complete the intramuscular injection. Intramuscular injection is usually necessary when intravenous injection is not easy or possible and when a more rapid effect is required than subcutaneous injection. Intramuscular injections are not indicated when the injection site is hardened or infected. If intramuscular injection is needed due to a medical condition, it is recommended to consult a doctor for a comprehensive evaluation of the condition.