Similar experience here with Tirzepatide. Overeating is punished swiftly and painfully.
If it works for you, look into getting one of the 15mg pens and counting clicks in order to get more doses per vial. I've been on the one pen for 3 months now and it's still got plenty of juice left.
One of the quirks of buying brand name GLP1s in the US is that we don't get the dial-a-dose pens, every autopen is one-shot. Some people disassemble them to get multiple doses, but at that point you might as well get the cheaper brand name vials or go with compound or gray.
Lilly Direct sells zepbound in “single use” vials you make draws from. Very trivial to add bacteriostatic water to them and do some simple math to divide the dose. I have a few friends who do this.
You can also take apart the pens and do the same thing, but it’s a lot more involved and you’ll need to source some sterile reusable vials for it.
When I was on Ozempic in the US (Bay Area), it was a dial-a-dose Ozempic branded pen. Came with 4-6 single use needles you’d screw onto the end before use, and discard into a sharps bin after.