Intramuscular (IM) Injection Procedure
It is optimal for an intramuscular injection to have in possession syringes without the tips (needles) already affixed to them. Preferably, the individual should have the hermetically sealed syringes (barrels) separate from the hermetically sealed needle tips. Although one can easily use syringes with the tips already affixed, it is slightly more complicated and adds an extra step or two into the process that otherwise would not be there. So, every individual should ensure to the best of their ability to have the syringe and needle tips separate. The following is a list of required items for intramuscular injections :
A secondary reason for using one needle to draw with and another to inject is that it can take a long time to draw a few cc’s of oil through a 25g. syringe or smaller. By using a lower gauge number to draw with (usually 18-22g.), it cuts down on the amount of time required to draw the oil into the barrel. It's recommended using no smaller than a 21-22g pin to draw with is because bigger pins can damage the rubber stopper after repeated uses, potentially allowing little pieces of rubber to break away from the rubber stopper and fall into the vial. A 21-22g pin is sufficient for quick drawing and will more thoroughly maintain the integrity of the rubber stopper.