This particular pair is "generally to be avoided."
You are quite correct to express a concern.
The doctor is under no obligation to offer you another drug, however, this is not good medical practice based on the fact that your concern is legitimate.
However if you were trying to dictate a specific drug to him this would also be inappropriate.
There is not an absolute contraindication to what he proposed.
I don't see an ethical or moral problem if tylenol is a good choice....certainly it is a safe choice.
The complaint would be filed with this boss, whoever that is.
I don't see other issues.
Let me know if you have further questions
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