You fear that if he tells you, he'd have to kill you?

I fear that he very well may do that anyway, Perry.
There. My faith in medical practitioners is revealed.

Next step a real medical man then. What some choose to name a 'doctor'.
Though I do wonder whether, even if this doctor knows the word I am seeking, it would be revealed.

I think you are correct. There's a tickle in the back of my brain that sometimes brings up the right word. Meanwhile, I plan to ask the next pharmacist I see.

Great idea! Now why didn't I think of that

Thanks, good people.
Not the word I have in mind.
I am mistaken, perhaps.

It's becoming my sole ambition!

No not either of those, Audiendus.
They are antonyms of agonist and agonistic? i.e. effect, (or not), of how they affect cell release of say, dopamine

All the suggested words could possibly apply but are not specific to counteracting medicine's side effects.

The word I am seeking is medicine specific, at least in my mind that is.

Imagined word? Perhaps but I am convinced not.

There is a word which describes the medical treatment which ameliorates the side effects of a primary treatment. e.g. chemotherapy drugs cause nausea so another drug is proscribed to treat the nausea. Pertaining only to drugs I think. The word is in my head somewhere but the passing years take the t...