Side Effect: Diarrhoea

Der Erlkasper

GLP-1 Apprentice
Member Since
Oct 23, 2025
Posts
30
Likes Received
36
Location
Germany
Germany
So I'm still on the 2mg dose, and got strong watery diarrhoea last week that slowly subsided.
I'm not sure if this was perhaps some unclean vegetable, or indeed caused by Reta, because it felt so much like food poisoning.

Anyone else experienced this? Does this pattern match the known side effects? Should I lower my dose, or perhaps skip a week?
 
The effects on gut motility do not make perfect sense in that it can cause constipation or diarrhoea. At a consistent dose, peak levels are reached at 4 weeks, so blood levels should peak a day or so after each dose and be slightly higher each week. The https://glp1plotter.com/ site is useful for visualising this as it is so different to just about any other drug in terms of its slow absorption and week long half life. Side effects correlate with peak blood levels.
I would agree with dropping the dose to 1mg for a while and then going up more slowly , to 1.5mg next time. In general gastrointestinal side effects are usually worst at about months 1 to 3 and then slowly settle in most people, going up in dose more slowly is the best way to minimise this.
 
I’ve been on Reta for 18 weeks, recently upped the dose from 3mg e5D to 5mg e5d and have had the explosions since. Also switched to Jeep Reta when I upped the dose. Couple theories, but Imodium seems to help. Hopefully just a short term adaptation
 
Some bathroom reading material:

What I don't see enough of: People using
telehealth
to manage GI symptoms. A person could even schedule weekly telehealth appointments with a board-certified internist. Or just use Amazon telehealth as needed. But the microdosers, to be consistent, may want to microdose GI meds too, haha.
 
Last edited:
Some bathroom reading material:


What is up with the way humans just LOVE to tell poop stories. I feel like across all cultures and all timelines, there is always a gaggle of humans who's here to tell you all about their pooping.
 
It happened to me my 2nd week of tirzapatide and again the 2nd week of retatrutide. Only happened once. I while try to stick it out for another week to see if it fades.
 
I had it in the beginning for a few days and maybe a day after a dose increase but mostly constipation is my issue.
 
Soluble fiber supplements may also help, though it may seem counterintuitive since they are also used for constipation.

In addition to probiotics like Florastor Advanced, the controversial supplement kratom is another long-term option (due to the mild opiod-like effects slowing down the lower GI system).

What is up with the way humans just LOVE to tell poop stories. I feel like across all cultures and all timelines, there is always a gaggle of humans who's here to tell you all about their pooping.
Diarrhea is the side effect my pharmacist warned me the most of, as far as why people stop taking tirz completely. For many on GLPs, this is the worst diarrhea they will have in their entire lives, especially if they had IBS-D before.
 
Last edited:
It happened in week 3. Weekly 2mg doses so far.
This is not unusual, as week 4 after first shot as that's when the reta level begins to peak and plateau. So, expect some additional troubles this week and next.

You have options:
1) go back to 1 mg or 1.5 mg and stay there for a month. As your body gets used to that dose, go up slowly to 2 mg. Your escalation may have to be slower to allow your body time to adjust.

2) stay the course and deal with it (not my preference) and hope your digestive system adapts sooner than later.

3) pay attention to what type of foods triggered the issue. When I started, fatty or oily foods would cause problems. You may be able to stay at 2 mg as long as you avoid triggering foods.

Of course, it is also entirely possible that you got a case of food poisoning, but I doubt it.
 

Trending Topics

Forum Statistics

Threads
18,316
Posts
190,896
Members
61,354
Newest
GLPGIRLY
Back
Top Bottom