OK, I found a PDF online from a RX. I have the full file is anybody wants it, has pics and the "correct" way to inject, ect. I tried to post it but too big.
Accidental injection of concentrated or irritating medications into subcutaneous tissue or other areas where they can’t be fully absorbed can cause sterile abscesses to develop. Such abscesses result from the body’s natural immune
response in which phagocytes attempt to remove the foreign matter.
Failure to rotate sites in patients who require repeated
injections can lead to deposits of unabsorbed medications.
Such deposits can reduce the desired pharmacologic effect
and may lead to abscess formation or tissue fibrosis.
Deltoid Typical injection: 0.5 ml (range: 0.5 to 2.0 ml).
Ventrogluteal:Typical injection: 1 to 4 ml (range: 1 to 5 ml).
Dorsogluteal: Typical injection: 1 to 4 ml (range: 1 to 5 ml).
Vastus lateralis (quad):1 to 4 ml (range: 1 to 5 ml; 1 to 3 ml for infants).