Pharmacies buy whichever FDA-approved generic is in stock and cheapest, so the pill can change look when the manufacturer changes, while the medicine stays therapeutically the same.
The FDA requires generics to match the brand in dosage, safety, strength, and effect, and to be bioequivalent. What differs: inactive ingredients like fillers and dyes, which explains appearance and rare reactions. Speak up if the new version seems to work differently, ask for a consistent manufacturer for narrow-therapeutic-index drugs like levothyroxine or warfarin, and check the label name and strength at every pickup.
What to do
Common questions
Why did my pharmacy switch my generic?
Because the pharmacy bought a different manufacturer's version this month, and it is almost always about supply and price, not your prescription changing. Multiple companies make the same generic drug, pharmacies buy whichever is available and cheapest, and the pill's color, shape, or packaging can change with the manufacturer even though the medicine inside is therapeutically the same. The FDA's position is clear: FDA-approved generic medicines work in the same way and provide the same clinical benefit and risks as their brand-name counterparts, and a generic must match the brand in dosage, safety, strength, quality, and how it works, and be bioequivalent, meaning it delivers the same active ingredient at the same rate and extent. What can legitimately differ: inactive ingredients like fillers and dyes, which is why the pill looks different and, rarely, why someone reacts to a specific manufacturer's version, such as a dye allergy. When to speak up: if the new version seems to work differently or causes side effects, tell your pharmacist and doctor; with narrow-therapeutic-index drugs like levothyroxine or warfarin, ask the pharmacy to keep you on one manufacturer; and check the label name and strength at pickup, which is also how genuine errors get caught.