Please Medical practitioner, Doctor, Nurses, Pharmacist and other professions in this field pls How does drug/medicine works?

I discovered taking drugs few hours later then the pain a person feels in any part of the body is gone.
So I realm wants to know how this thing works.
Kindly please explain in a lay man's language.

Thank you

Which particular drug?
Every drug has it's own specific mechanisms of action, except those belonging to the same class.

ChybuzzDD:
Which particular drug?
Every drug has it's own specific mechanisms of action, except those belonging to the same class.

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T&C
Total sales is 90k and you get to earn 15k✅ as your wage. It doesn't matter if you use one day or one month to achieve the goal. You will still earn your 15k anything you reach the goal. No pressure. Work at your own pace.
Tasks is each to achieve. All you have to do is follow instructions.