If you hit a nerve, IMMEDIATELY WITHDRAW, and chose a different site. Nerves often cannot regrow.
Deltoid is relatively safe. But triceps and biceps areas are dangerous; many nerves and arteries.
You may cause more damage by injecting in the nerve. Sciatic is a big, big nerve and you can inject 1 cc into it. There are several thick nerves in arm too.
Safest is gluteal area, in the fleshy part 1-2 inch from midline.
Deltoid is relatively safe. But triceps and biceps areas are dangerous; many nerves and arteries.
You may cause more damage by injecting in the nerve. Sciatic is a big, big nerve and you can inject 1 cc into it. There are several thick nerves in arm too.
Safest is gluteal area, in the fleshy part 1-2 inch from midline.