Actually, this is an interesting question.
I seldom have had an MD warn me about side-effects of any med unless I asked specifically. Most of the time it’s the pharmacist who does this.
That’s why you get that big bundle of paperwork everytime you get your meds.
As a RN, every time we got a new pt. into long term care or a skilled nursing facility, we would routinely review their meds, since most older folks are WAY overmedicated (by their multiple doctors). We had a pharmacist on call of just this purpose.
I remember once we had a woman come in for “end of life” care – they thought she had afew more weeks at best. Couldn’t walk, barely talked, etc.
Turns out she was on routine Digoxin, hadn’t had a blood level done in YEARS. Dig can be toxic as hell – took her off that and about 80% of the rest of her meds.
In less than a month she was up walking (with a walker), talking…lived another year+ with a pretty good quality of life.