Here are the four types of medicines that fight pathogens:
1. ANTIBIOTICS: Known as an antimicrobial agent which includes penicillin, tetracycline, etc. This type of medicine is used to fight bacteria.
2. ANTIVIRAL: This type of medicine is used to combat viral infection such as influenza. Examples of this medicine include amantadine.
3. ANTIFUNGAL: Used to treat infection due to fungi such as yeast infection.
4. ANTIPARASITIC: Used to treat parasitic infestations.
Hope these answers help.