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The goal would be a shallow subcutaneous injection over the point of maximum tenderness, or a very careful intramuscular injection into the shoulder or bicep muscle belly nearby never into the tendon itself

2013 Jun 10;184:1-5

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Common injection sites: For Intramuscular (IM): Upper arm (deltoid) Outer thigh (vastus lateralis) often the easiest self-injection site Upper outer gluteal muscle usually requires assistance For Subcutaneous (SQ): Abdomen (at least 12 inches away from the navel) Outer thigh Back of the upper arm What are the side effects