___ is used to build your immunity against certain diseases.
Vaccine
The vaccine is an antigenic substance prepared from the causative agent of a disease or a synthetic substitute used to provide immunity against one or several diseases.
Antibiotic is a medicine (such as penicillin or its derivatives) that inhibits the growth of or destroys microorganisms.
Antiseptics are used to kill or eliminate microorganisms and/or inactivate virus on living tissues.
An analgesic or painkiller is any member of the group of drugs used to a relief from pain.