Yea whatever you do, do not ingest your IM T. Your body is not made to digest it properly and over time will destroy your liver. Not what we want to have happen to you man! However, as far as the little bit left in the needle I don't know if you use 2 needles or not but when you draw the T into the syringe with the first needle draw back a little further so that there is nothing left in the first needle then apply the "shot" needle and push in until the air is gone. My doctor did not prescribe 2 different size needles but my pharmacist always gives me an 18 gauge to draw from the vile then the prescribed 22 gauge for the injection. This allows for a fresh, sharp needle to be used for the skin. Using the needle to draw from the vile can cause a dullness in the needle, which can cause more ouch! Just though I would let you know what I do, maybe it will work for you. Oh btw the T left in the needle is considered waste and the syringe is calibrated for such. Hope this helps man!