What do pain relievers, anti-inflammatories, antivirals, and antihistamines manage

All the provided categories of medicines helps one to manage distinct kinds of symptoms.

Explanation:

Any physical or mental characteristics that suggest the existence of a disorder or a disease in an individual is considered as a symptom like headache, back pain, fever, vomiting, and others. The different kinds of symptoms are managed or controlled with the assistance of distinct kinds of medicines. Like pain relievers that assists in minimizing distinct kinds of pain like muscle pain, headache, and others.  

Identically, antivirals are used in the treatment of viral infections like flu, and anti-histamines refers to the drugs that are used in the treatment of the symptoms of an allergic reaction like teary eyes, sneezing, running nose, and others.  

enzyme speed up the reactions

sorry, but you do not have posted the diagram.