Injection in buttocks: 1" vs. 1 1/2" needle

I am a new graduate who has yet a lot to learn but I am a bit confused :confused:about giving injections in the buttocks. One of the nurses who trained me told me to use a 1 inch needle when you give Depo-Provera, Phenergan, Kenalog and B12 injections. The only time I use the 1 and 1/2 inch needle is when I give Depo-Testosterone and Rocephin.

Last week I had to give a Phenergan injection to a dehydrated patient who came into our clinic for an office visit (I work in Family Practice). I started her IV and once she was settled I gave her anti-nausea medication in her bottom using a 1″ needle. Another nurse (20 year veteran) who was working with me told I should have used a 1 and half inch needle instead of a one inch needle. Then yet another nurse (30+) told me I should have given injection in the arm with 1 inch. Who is right? Please help!

In a small person with little padding for an IM injection I’d opt for a 1 inch needle (elderly, child). In those with extra padding, I’d go for 1 1/2 inch. If there is more tissue, you have to make sure you get through it into the muscle, so a bigger person will need a longer needle.