I guess that I have a bit of a pet peeve with the term, “side effects” when applied to pharmacologics.
IMO, there are drug effects on your body and there are your body’s effects on drugs. It is ok to say “beneficial”, “desirable”, “adverse” and “undesirable” effects, within a context.
The peeve is because I think that the use of “side effects” simplifies the issue, is always relative and, basically, thwarts a better understanding of drug action in general.
Take for example (a mostly archaic example, but one that is easy to understand) dextroamphetamine (speed, upper). When the same dose range was administered for obesity or pregnancy weight gain, the “side effect” was labelled as mania (in this case, increased mood, excitement, hyperactivity). When administered as an antidepressant, the “side effect” was labelled as anorexia (in this case, weight loss from diminished appetite).