What I am working with: constipation · cagrilintide · REDEFINE-1.
I would like help reading this properly rather than being told what conclusion to reach.
I have the full report including the method section, so I can quote specifics if that helps.
What would I need in addition before this supported a decision?
Take it from the REDEFINE-1 adverse-event table by arm, and check the unit before you use it. An incidence can be the proportion of participants who reported the event at least once, or the count of events divided by exposure time, and the two differ by however many people had it repeatedly. Then subtract the placebo arm, because the untreated rate is not zero. And read the discontinuation column beside it: an event that made people leave the trial is under-counted at every later visit, so a low late-timepoint incidence can mean the event was severe rather than rare.
Start with the three inputs: fibre grams, fluid volume and physical activity. Most cases resolve on the first two.
Soluble fibre — psyllium, oats, legumes — holds water and softens stool. Insoluble fibre adds bulk and speeds transit. In slowed-transit constipation the soluble kind is generally the more useful of the two.
| Event | Active arm | Placebo arm | Timing |
|---|---|---|---|
| Nausea | 40–45 % | 15–20 % | Peaks 1–2 wk after each step |
| Vomiting | 15–25 % | 5–8 % | Follows nausea |
| Diarrhoea | 20–30 % | 10–15 % | Early, variable |
| Constipation | 20–25 % | 8–12 % | Later onset, persistent |
| Discontinuation for GI events | 4–7 % | 1–2 % | Mostly during escalation |
Ranges span agents and doses; read the specific prescribing information for a specific figure.
Red flags that change this from a management question to a clinical one: no bowel movement for several days with abdominal distension and vomiting, blood in the stool, or unexplained weight loss beyond what is expected.
Osmotic laxatives such as macrogol have the strongest evidence base for chronic constipation and are first-line in most guidelines.
Nothing here is medical advice.
Osmotic first, stimulant reluctantly, and not as a standing arrangement.
edited 15 Jun 2025 by Dr_Tomas_Kral — fixed an arithmetic slip in the third paragraph
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Browse resultsAnswering this needs the actual fibre and fluid intake, and people are almost always taking less of both than they think.
Osmotic agents such as macrogol draw water into the lumen and are the usual first pharmacological step; they work with the mechanism rather than against it.
Adding fibre without adding fluid produces a larger, drier, harder stool and makes the problem worse. The fluid is not optional and is the step people skip.
Research-use compounds are not approved for human use.
This one does not attenuate with tolerance. Plan for it rather than waiting it out.
The short version: fibre to 25 to 30 grams a day, fluid to match, movement daily, and osmotic laxatives if that is insufficient.
Physical activity has a modest but real effect on transit time and is free, which makes it worth including even though it will not fix this on its own.
Aim for 25 to 30 grams of fibre a day, which requires deliberate planning at a reduced total intake because fibre-rich foods are bulky and satiating exactly when appetite is suppressed.
Physical activity has a small measurable effect on colonic transit time in controlled studies.
25 to 30 grams a day, deliberately planned, because it will not happen by accident.
The honest answer is that this needs an active plan rather than waiting, since it does not usually resolve on its own.
Stimulant laxatives are effective and are not a first choice for a problem that is going to persist for months, because of tolerance and dependence concerns with regular use.
Pain, distension and vomiting together are urgent. That is not constipation.
Severe abdominal pain with no bowel movement and vomiting is a different problem entirely and is urgent.
Magnesium-containing preparations act osmotically and are widely used; they are a laxative rather than a supplement in this context, and the dose is what makes the difference.
Fibre and fluid together. Fibre alone makes it worse and that is the commonest mistake.
Ask PeptideStack is a static archive. Posting is closed, but the norms are worth stating: answer the question that was asked, show your working, cite the trial or the certificate, and say plainly where the evidence runs out.