http://www.elitefitness.com/forum/anabolic-steroids/taking-anabolic-steroids-101-a-642856.html
you will want to read the whole thread, but post 7 in where the info you are looking for is.
Yes some nurses or doctors may do this but they are 100% dead wrong when they do. They have been taught by any and all medical schools " not to do this" .
In fact when you look in the "Encyclopedia of Nursing & Allied Health" hand book under "Precautions" it says and I quote " Change the needle after drawing the medication into the syringe".
Z-Track Injection: Encyclopedia of Nursing & Allied Health
here is the ful list of predautions if you dont feel like going to the site.
Precautions
Precautions taken when giving Z-track injections are all aimed at preventing the medication from leaking into the subcutaneous tissue or skin. These precautions include:
* Do not give a Z-track injection into skin that is lumpy, reddened, irritated, bruised, stained, or hardened.
* Add 0.3–0.5 ml of air into the syringe after drawing up the correct dosage of medication.
* Change the needle after drawing the medication into the syringe.
* Select a long needle (2–3 inches; 5–7.5 cm), depending upon the size of the patient, with a 21- or 22-gauge needle to place the medication deeply within the muscle.
* Give Z-track injections into a large muscle in the buttock (the gluteus medius or gluteus minimus).
* Aspirate on the syringe before injecting the medication to be sure not to hit a blood vessel. If blood appears in the syringe, a vein may have been hit. Remove and discard the syringe and medication. Start over with a new syringe, fresh medication, and a new site.
* Caution the patient not to wear restrictive clothing that could put constant pressure on the injection site.
* Rotate the injection sites from one buttock to the other and from site to site.
* Do not place injections into a disabled limb. If there is decreased circulation, the medication absorption will be affected and abscess formation can occur.
* Never inject more than 5ml of medication at a time when using the Z-track method. If a larger dose is ordered, divide it and inject it into two separate sites.
YouTube - Intramuscular Z-track Injection
a vid on it
This is just one kind of IM injection they do but any kind the Precautions are always the same. Yes you can get away with using the same needle. And you will prob never ever get a infection from it so long as you clean the top of the veil but if you have ever felt the difference between a needle that you used in the stopper and one that you did not. The smoothness at which it injects and goes through the muscle is like night and day.. It is much less painful for the patient and for you and this is the main reason I don't do it and never will.