tl;dr - Asking your doctor for the shortest reasonable course is a good thing that will both protect you as a patient as well as minimize your risk of antimicrobial resistance. But the key phrase is ask your doctor, do not take it upon yourself to decide when to stop them. Take whatever course you’re prescribed.
Pharmacist and 4th year medical student with a passion for antimicrobial stewardship and infectious disease.
Historical treatment duration for most infections was truly quite arbitrary. Evidence for most infections, when it is actually tested, have pretty consistently demonstrated shorter treatment durations than were classically taught (10-14 days for pneumonia now generally 5-7, 14 days for Gram Negative Bacteremia now 7, etc). There is a subset of infectious disease doctors that are bucking the trend of historical “you have to complete your course advice” for some infections. In general, what I have seen is recommendations to discontinue antibiotics with significant clinical improvement AND a non-life-threatening infection in a non-sterile body cavity. So nobody is shortening course durations for empyemas or endocarditis.
The issue becomes expecting patients to know what constitutes clinically meaningful recovery and whether or not their infection is one of the “safe” ones to stop antibiotics earlier.
At the end of the day, I totally disagree with your premise, as we should always strive for the minimum safe antimicrobial exposure. However I do agree that telling patients “shorter is better” is bad advice because I don’t want laypeople making these decisions when usually no-ID physicians don’t make them.