This is the part that actually makes DoseGuard useful - checking whether the medicines you’re on are dangerous together.

Up to now the app could recognise a drug and figure out its ingredient, but it couldn’t say anything about safety. So I built the interaction checker.

When you hand the app a list of medicines, it takes each one, boils it down to its real ingredient (using the part I built earlier), and then checks every possible pair against that database. If it finds a clash, it tells you which two drugs, how dangerous it is, and why.

I started the danger list small and curated by hand, just the well-known serious interactions, so I know it’s accurate.