Which word describes the term vaccines?

Medical Definition of Vaccination. Vaccination: Injection of a killed microbe in order to stimulate the immune system against the microbe, thereby preventing disease. ... To immunize against viral diseases, the virus used in the vaccine has been weakened or killed.

Vaccines can be described as drugs, or medication, since that's pretty much what it is. I'm sorry if I sound a little vague, but I don't know much about this

9, 5, 10000000 ( that is supposed to be a ten for the last one)