Hypodermic projectile

A hypodermic projectile which is adopted to inject a liquid drug into an animal or human upon contact therewith, the projectile including a hollow body having a thin, readily frangible, front wall and a rigid rear wall with a liquid drug in between. Also present in the hollow body is a gas, under pressure, which forces the drug out of the projectile when the front wall shatters. The thin front wall shatters on contact with an animal or human having a plurality of sharp cutting edges which penetrate the skin and any covering on the body, thereby facilitating entry of the drug into the animal or human being treated.