Are generic medicines as good as branded ones?

Yes, when properly regulated. Generics must demonstrate bioequivalence with the same active ingredient, strength, and route. Differences are typically in inactive ingredients and price, which can be substantially lower.

Regulated generics must demonstrate bioequivalence, meaning blood levels fall within an accepted range of the original.

For narrow-therapeutic-index drugs like warfarin, levothyroxine and some antiepileptics, staying on one consistent brand or generic is preferable to switching frequently.