Because Google’s med palm 2 is a medically trained chatbot that performs better than most med students, and some med professionals. Further training and refinement using new chatbot findings like mixture of experts and chain of thought are likely to improve results.
Generic meds vs brand meds.
Brands pay a lot for branding, and thus charge more. The formulas are moderated and regulated by the FDA, so unless you enjoy paying for ads, get the generic.