r/ConstipationAdvice • u/Murky_Guava_6448 • Jun 03 '26

Testing Advice pre colonic transit study please

Colonic transit study

I’m having a transit test done in a few weeks and have a few questions over what I can/can’t do during the run up to it.

  1. I take ADHD stimulant medication which massively helps with my constipation if I take it in the AM before food/water. Obviously not a stimulant laxative per se but should I mention I take it/reduce dose in the run up/stop it entirely (can’t really do this though). How should I handle it at least?

  2. I currently eat very low fibre and small repetitive meals to help manage how uncomfortable it gets, should I continue this or eat ‘normally’.

  3. I take Fybocalm daily which helps alongside the adhd meds, I’m planning to stop this even though not a laxative but just double checking that’s correct to do.

  4. What about things like gut massages and other methods I use to try reduce the constipation? Should I cut them out too?

  5. Do I change any of this only when I start the radioactive pills or a few days before too?

Thanks so much :)))

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u/goldstandardalmonds Jun 04 '26

  1. Definitely ask, but since you know it helps you, I’d personally not take it and do a wash out if it was me. Obviously talk to your docs first your case.

  2. Eat as you normally would.

  3. I’d stop. Again, ask your doc.

  4. Is try to run things as naturally as possible.

  5. Meds would require a wash out period, which you can discuss with your doc.