I recap the needle and stick the syringe (needle attached) back into the individual plastic packaging that it came in, shove the empty amp down in there beside it and the alcohol swab and package that it came in on top of the vial, then throw it in the trash. Probably not a good idea though. If someone were to stumble onto it in the trash bag and also find mail with my name on it.... never put much thought into this, but need to.