Well, I think you are right in that it is going to vary from person to person AND from drug to drug, but isn't it aso true of all symptoms and all positive responses to psychiatric drugs and all negative responses to psychiatric drugs?

Take depression. It may be accompanied by weight gain or weight loss or no change in weight. It may be accompanied by hypersomnia or by early awakenings and reduced sleep. And the differences are not only person to person but also episode to episode for the same individual or even be present, in turn, within one individual.

Some people get racing thoughts and others do not. And so on and so forth.

We react differently to the same medications. What helps one person does nothing good for the next.

We develop different side effects or no side effects - the response varies from patient to patient and depends on the dose and on the interactions between multiple drugs.

The response to a new drug by and large cannot be predicted without trying.

It is logical to conclude that the response to alcohol also depends on the person and cannot be predicted without trying. Why would it be otherwise?? What is so special about alcohol that we are urged to believe that our response to it would be a) predictable and b) uniform without variation from person to person?? It is like singling out alcohol as a bad guy.