[sliverstorm]

Wait, the doctor can prescribe an arbitrary dosage (at least in mg, for example)?

Well, anyway, my point was that if dosage units are standardized (I thought they were, but maybe I'm wrong), e.g. 50mg capsules, the doctor cannot well prescribe a patient 5mg.

[TeMPOraL]

In case of non-psychoactive drugs I've seen doctors prescribing medicines in increments of 1/2 or even 1/3 of a pill.