Why do some brands of medication have different affects than others?

Question

I’m talking about a singular type of medication. So for example: i take Verapimil to control my palpitations.

Some brands help control it better than others, also the capsule form controlled it better than the tablets. I can’t get the capsules anymore but i’ve been through 3 different brands same strength all tablets but 1 brand helps curb the palpitations but the other doesn’t.

I’m assuming this is same for most medications?

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Flare i don’t know if it’s biology or chemistry so stuck with the safer option

E – this is UK BTW not sure if it makes a diff

In: 2

Answer 1

I ask that myself too. I take Quetiapin to sleep and some brands work way better than others. You are also not supposed to change brands of thyroid medication.