A 25G, 5/8 needle is the recommended size for insulin injection because insulin is administered by the subcutaneous route. An 18G, 1 needle is usually used for I.M. injections in children, typically in the vastus lateralis. A 22G, 1 needle is usually used for adult I.M. injections, which are typically administered in the vastus lateralis or ventrogluteal site.
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