Dropping the Kids Off
Mounjaro doesn't just kill appetite, it slows everything else down too. What that's actually meant for me, and whether reaching for Immodium on the bad days is a good idea when the gut's already running slow.
Mounjaro doesn’t just quieten the appetite down. It slows the whole gut down, and the bit nobody really warns you about is what that does to the other end.
Before starting, I was regular. Every day, usually without much thought involved.
Now it’s every two or three days. Some plain language for it: I go for a lot longer between dropping the kids off at the pool than I used to.
That’s separate from the diarrhoea. The two aren’t the same thing, even though they sound like they should cancel each other out.
The diarrhoea comes and goes, unpredictable, occasional, its own event when it happens. The reduced frequency is just the new normal running in the background most days, regardless of whether anything dramatic is happening that week.
Slower gut, most of the time. An occasional fast, messy exception to that. Both real. Both from the same medication, pulling in different directions on different days.
I keep wondering how much of the “every two or three days” is actually the gut slowing down, and how much of it is just that there’s less going in to begin with.
Eat less, and there’s less to pass. That’s not really a side effect of Mounjaro specifically, it’s just arithmetic. I genuinely don’t know how much of the change is the drug slowing transit, and how much is simply smaller portions producing smaller, less frequent results. Probably both. I don’t have a way of pulling those two apart from the inside.
The other question I went looking for an answer to: on the days it’s the other problem, would Immodium actually help?
The honest answer is more complicated than I expected.
General guidance treats short, occasional use as reasonable. A dose or two to get through a bad day, nothing regular, don’t lean on it for more than about 48 hours.
But loperamide doesn’t work by settling the stomach. It works by slowing the gut down further — the same direction Mounjaro is already pushing it. Stack a motility-slowing drug on top of a medication that’s already doing exactly that, and you’re not just treating the diarrhoea. You’re doubling down on the thing that gave me the every-two-or-three-days problem in the first place. Some of the research on this flags that exact combination as worth being cautious about, for exactly that reason.
So: occasional, short, for a genuinely bad day, probably fine. A regular fixture in the cupboard I reach for automatically, probably not — not while my gut’s already running this slow to begin with.
I haven’t needed to test that theory yet. I’d rather not have to.