WHAT IS THE MECHANISM OF ACTION FOR GUAIFENESIN ORAL AS A LIQUID

I JUST NEEDED TO KNOW THE MECHANISM OF ACTION FOR EACH DRUG AS PART OF A SCHOOL PROJECT

PLEASE HELP ME OUT AS MUCH AS YOU CAN, I AHVE GONE TO SEVERAL WEB SITES AND NONE OF THEM TELL ME THE MECHANISM OF ACTION

1 DEXTROMETHORPHAN HYDROBROMIDE
2. GUAIFENESIN
3. ACETAMINOPHEN

4.

Anti-fever actions of Aceteminophin

Hi, My name is Bo. Im a third year Medical student in the philippines.  

Acetemenophin (Tylenol) is a Non-Steroidal Anti-inflammatory drug.  When you get sick, you're immune system sends chemicals to your temperature control center of the brain (hypothalamus) to produce a chemical called Prostaglandin. This prostaglandin is responsible for fever. When acetimenophen is given, it inhibits the production of prostaglandin, thus lowering your fever.

I hope this helped