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The Reasons for Decreased Use of Buttock Injections It hasn’t completely disappeared, just being used less. Some medications can only be injected into the muscles, such as streptomycin. An intramuscular injection essentially means injecting into the muscles, the one on the far left in the image below.

When to choose upper arm and when to choose buttocks? It hasn’t completely disappeared, just been used less. Some drugs can only be injected into the muscles, like Streptomycin. Buttock injections are essentially muscle injections, as shown on the far left in the image below.