I had the stuff prescribed because I am at that age but the directions from them were specifically not to inject it inetermuscularly but to do it Sub Q under the navel. On here I heard many times that it does not matter so here is my theory. If it does not matter and my doc says definately Sub Q then I am definately going to do it Sub-Q because why waste scar tissue in your muscles if you can just let it hang out under your skin for the same desired affect in my head that would mean less scar tissue. That is my reasoning for my theory!
I am by no means an expert nor a doctor, but that is the method for my madness! Either way I hope it works for you!!