Question

Chemicals which kill or stop the growth of pathogens

Answer 1

Antimicrobial-Kill microbes.
Antibacterial-Kill bacteria
AntiFungal-Kill Fungi
It is difficult to kill virus as it uses host's cells to multiply.
It is difficult to kill prions as well.
Worms like tapeworm can be removed by surgery or Antinema(Anti roundworm medicine).

A common medicinal salt to reduce painful symptoms like fever is paracetamol.