Hi Karen, I remember being in your shoes - the first two months were a lot of tears, and, honestly panic. As you will read from others too, things calmed down and we started focusing on living and finding strength once treatment was routine. This forum really helps me stay strong. My husband was on Prostap for 2 years (just ended), but injections were all in the tummy. Someone on here did report having an injection in the arm and raising the issue to get it in the abdomen next time. I think this was in the past year. It might be good to retitle this thread "Is Prostap in the arm ok or a problem" to see if that person responds. Sorry I cannot recall who it was or find the thread and cannot find a search function to look for "arm". Good luck to you and your husband. Big hugs to you.