sophie_paris said:Heartburn management on constipation: omeprazole 20mg has been my savior.
Drug interaction alert relevant to constipation: if you take oral levothyroxine (Synthroid), GLP-1 agonists can reduce absorption due to delayed gastric emptying. My TSH drifted up after starting semaglutide.
Solution: take levothyroxine on an empty stomach, 60 minutes before any food, and have your TSH rechecked 6-8 weeks after starting or changing GLP-1 dose. My endo had to increase my Synthroid by 12.5mcg.
SkepticalSean said:Acid reflux and constipation: I developed GERD symptoms around week 7 that I'd never had before.
This answered a question I did not know how to ask. Taking it to my next appointment.
sophie_paris said:Heartburn management on constipation: omeprazole 20mg has been my savior.
Gastric emptying studies and constipation: semaglutide delays gastric emptying by ~40% at steady state, as measured by acetaminophen absorption testing and scintigraphy[1].
Clinically relevant implications:
- Explains early satiety and nausea
- Affects absorption of co-administered oral medications
- Creates aspiration risk for procedures under anesthesia
- Contributes to constipation via slowed GI transit
Importantly, the gastric emptying delay attenuates with continued use (tachyphylaxis), which correlates with the transient nature of GI side effects.
[1] Blundell J, et al. Diabetes Obes Metab. 2017;19(9):1242-1251.
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View ResultsOne concrete data point for the thread. For anyone reading later: the numbers in this thread are worth checking against a primary source before you act on them, including mine. Half the figures circulating in this community trace back to a secondary summary that dropped a qualifier.
Moderator note: leaving this open. It is being argued well and the disagreement is the useful part. Report rather than reply if it drifts again.