09-30-2006, 01:10 AM
Actually, it depends on what shot they're giving you for the needle size. Intra-muscular shots (like tetanus boosters) have to be given in large needles. Muscle is dense enough to snap a thin needle if the patient flexes involuntarily. As for why some shots are intra-muscular and others are not...well I have no idea. Get Wisemon to ask his parents. Unless I'm mistaken, one of them is a doctor.