Final answer:
Excavation of side effects refers to uncovering negative outcomes of medication, while excavation of the main effects involves understanding intended outcomes.
Step-by-step explanation:
Excavation of side effects refers to the process of uncovering or discovering the negative and unintended outcomes or reactions that can occur as a result of taking a specific drug or medication. These side effects may range from mild discomfort to severe health consequences. On the other hand, excavation of the main effects involves understanding and exploring the intended and desired outcomes or effects of a drug or medication. These main effects are the target effects that the drug is designed to produce in order to treat a particular condition or symptom.