All oil based and water based anabolic steroids should be taken intramuscular. This means the shot must penetrate the skin and subcutaneous tissue to enter the muscle itself. Intramuscular injections are used when prompt absorption is desired, when larger doses are needed than can be given cutaneously or when a drug is too irritating to be given subcutaneously. The common sites for in intramuscular injections include the buttock, lateral side of the thigh, and the deltoid region of the arm. Muscles in these areas, especially the gluteal muscles in the buttock, are fairly thick. Because of the large number of muscle fibers and extensive fascia, (fascia is a type of connective tissue that surrounds and separates muscles) the drug has a large surface area for absorption. Absorption is further promoted by the extensive blood supply to muscles. Ideally, intramuscular injections should be given deep within the muscle and away from major nerves and blood vessels.

The best site for steroid injections is in the gluteus medius muscle which is located in the upper outer quadrant of the buttock. The iliac crest serves as a landmark for this quadrant. The spot for an injection in an adult is usually to 7 1/2 centimeters (2 to 3 inches) below the iliac crest. The iliac crest is the top of the pelvic girdle on the posterior (back) side. You can find the iliac crest by feeling the uppermost bony area above each gluteal muscle. The upper outer quadrant is chosen because the muscle in this area is quite thick and has few nerves. The probability of injecting the drug into a blood vessel is remote in this area. Injecting here reduces the chance of injury to the sciatic nerve which runs through the lower and middle area of the buttock. It controls the posterior of each thigh and the entire leg from the knee down. If an injection is too close to this nerve or actually hits it, extreme pain and temporary paralysis can be felt in these areas. This is especially undesirable and warrants staying as far away from this area as possible.