The pharmacy almost certainly switched generic manufacturers.
The active ingredient and strength stay the same, but the look changes because trademark law forbids a generic from copying the brand-name pill's appearance - and pharmacies change suppliers based on price and availability. Still, never take a pill you cannot match to your prescription: check the bottle label for a manufacturer note, then confirm with the pharmacist if anything is unclear.
What to do
Common questions
Why does my pill look different than last refill?
Almost always, the pharmacy switched to a different generic manufacturer. The active ingredient, strength, and how the drug works stay the same, but the color, shape, or imprint changes because trademark law forbids a generic from copying the brand-name pill's appearance - and different generic makers use different looks. Pharmacies change suppliers based on price and availability, so the same prescription can look different from refill to refill. That said, do not take a pill you cannot match to your prescription. Check the label on the bottle first - most pharmacies note the manufacturer change there - and read the imprint code stamped on the pill itself. If anything still does not line up, call the pharmacy before taking a dose; dispensing errors are rare but real, and a two-minute call settles it. Pymander, a free AI doctor available 24/7 by text, can help you think through what you are seeing.