This is probably (if the business here is large enough to support it) an excellent area for a tailored model instead of a general purpose LLM. A lot of the context around medication comprehension is going to be rather universal to pharmacies and other HCPs so ideally that information would be baked into the model itself with the actual user supplied context mostly being focused on business specific logic. The commodity LLMs are just an amalgam of a hammer welded to a screwdriver, a car, a compass and a toothbrush - more specialized models, with more specialized testing and offered by a company specialized in the field would possibly offer a decent customer experience here?

With something like healthcare though I'll remain eternally skeptical that anything other than a licensed expert will be palatable to the public.