It may depend quite a bit on the pill. As an adult I can easily dry swallow things like ibuprofen. But I'm not sure about something like oral steroids.
I was prescribed them as a kid due to a particularly bad poison ivy reaction. I couldn't swallow pills at the time, so after running through all the tricks to teach someone, we ended up grinding them up and sticking them in ice cream. It was something like 15 years before I could eat cookies and cream again without tasting steroids. Grinding them definitely exacerbated the problem, but I'm not sure how I'd fare if prescribed the same pills again.
I would slightly discourage that here. The Color of Magic is fine, but the Light Fantastic is a bit rough. Equal Rites is fine again, but doesn't really focus on the characters that make the Witches series good.