Why do medicine tablets vary in size?

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I take a number of medications and I’m curious about why some tablets are larger than others. I don’t expect it’s related to the amount of medication in each tablet because that’s typically measured in milligrams. So why is my 1mg Folic Acid supplement a much larger tablet than my 25mg hydrochlorothiazide diuretic?

TIA

In: 2

1. Larger tablets are typically to slowly release medication into the body while it travels through. So it doesn’t just dissolve and get used up immediately.

2. Strict patent laws on pills make it so even if there are two very similar drugs they have to look completely different (size, color, shape) to be sold as a different drug.