IM injections, also known as intramuscular injections, are a method of administering medication into the muscles. They are commonly used to deliver vaccines, hormones, and other medications that cannot be taken orally or need to be delivered quickly and directly into the bloodstream. The medication is usually injected into the muscle using a needle and syringe, and the muscle tissue helps to absorb the medication and release it into the bloodstream. Common sites for IM injections include the deltoid muscle in the arm, the gluteal muscle in the buttocks, and the thigh muscle.

The number of sessions needed for IM injection treatment depends on the medication being administered and the medical condition being treated. For example, a vaccine typically only requires one or two doses to be effective, while hormone treatment may require periodic injections over an extended period of time.

The results of treatment with intramuscular injections (IM) can vary depending on the medication being administered and the reason for administration. Some medications may have rapid and notable effects, while others may take several days or weeks to take effect.