When describing a drug's cellular action, explain how it influences chemical communication in the body by blocking, binding, enhancing, or mimicking. In what ways does the drug alter physiology?
Try searching the name of the drug AND pharmacology. Also try: name of the drug AND "mechanism of action"
If unable to find the chemical nature in any other sources, use Google, but limit to government information to ensure accuracy and credibility.
Limit by including this phrase: site:.gov [site colon dot gov]