What type of needle should be used during an adult intramuscular injection?

Using a 22-gauge straight needle for an adult intramuscular injection is appropriate because it strikes a balance between being large enough to administer the medication effectively while minimizing discomfort during the injection.

The gauge of a needle refers to its thickness, with a higher gauge indicating a thinner needle. A 22-gauge needle is commonly used for intramuscular injections because it allows for a moderate flow of medication, which is especially important for certain types of viscous medications that may not pass through a thinner needle easily.

In contrast, larger gauge needles, like an 18-gauge, may be too large for most intramuscular injections in adults, which can lead to unnecessary pain and tissue trauma. Smaller gauge needles, such as a 25-gauge, could make it difficult to administer certain medications effectively due to increased resistance. Additionally, a curved needle is less commonly used for intramuscular injections where a straight needle provides the necessary precision and control.

Therefore, the use of a 22-gauge straight needle optimizes patient comfort and ensures the efficient delivery of medication into the muscle.