Cross Breeds

What size gauge of needle is used for race horses?

My husband gives his horses lots of vitamins like b12 and stuff and the needle I've seen is huge, along with the syringe. I got asked what gauge it is but he is busy right now and don't want to bother him. Anyone have an idea?

Public Comments

1. Gauge of needles differ with the viscosity of the medication given. For average medications, I use an 18 or 20 gauge but that is just for what I administer. Your husband's could be different, but hope that helps you with the generality you are seeking.
2. The size of the needle depends on the medication being injected. A large-diameter needle (18 gauge) works best with thick solutions such as penicillin, while a smaller-diameter needle (20 to 21 gauge) can handle a thin, watery solution. Remember, a larger gauge number equals a smaller diameter. Larger gauge needles may break more easily than smaller gauge. If your horse reacts adversely to the injection and breaks the needle, you should make sure you can find both pieces of the needle. If you suspect a piece of needle may be retained in the horse's muscle, consult your veterinarian. Most IM shots are given to adult horses with a 1-1/2-inch needle so that the medication is injected deep into the muscle mass. Foals are usually given IM injections with a 1-inch needle.
3. I recommend a 21 or 22 gauge 1 1/2 inch needle for B12 injections. You want it to be injected deep into the muscle tissue, and since B12 is thin and watery, you don't need a larger gauge needle. The small gauge means less trauma and less leakage back through the needle tract.
4. As far as I know there is typically only one size needle used for horses and that is 18 gauge.