pathogenAn agent of infection is a pathogen.
A cytotoxin is an agent that kills cells
In medical terms, an agent usually refers to a medication. For instance, an antihypertensive agent reduces blood pressure.
A teratogen is an agent that causes birth defects.
A carcinogen is an agent that causes cancer.
nonpathogen
An antineoplastic agent is one that works against tumors. A tumor is also known in medical terms as a neoplasm.
Antagonist is a process or agent that works against another.
bronchodilators
An agent used to increase the effectiveness of a medication is a "potentiator".An agent used to increase the effectiveness of a medication is a "potentiator".
Androgenic is the medical term meaning promoting masculine characterisitic. An agent that promotes these characteristics is called an androgen.
Some people use glucosamine and chondroitin