What is the recommended needle angle for an intramuscular injection?

• A. Insert needle at 90 degrees
• B. 180 degrees
• C. 45 degrees
• D. 60 degrees

Answer: (A)

The main idea is to deposit the medicine into muscle tissue by aiming the needle straight in, perpendicular to the skin. For most adults, this means inserting at a 90-degree angle. This 90-degree angle ensures the needle tip reaches the muscle rather than staying in the subcutaneous fat, which allows faster and more reliable absorption of the medication. A 180-degree angle would drive the needle straight through and could injure deeper structures; it’s not how intramuscular injections are delivered. A shallow angle, like 45 or 60 degrees, tends to place the injection into the subcutaneous tissue, leading to slower absorption and less predictable effects. In practice, a 90-degree angle is the standard approach for IM injections with the appropriate needle length, keeping safety and efficacy in mind.