JenPlateau said:The mechanism is slowed transit plus reduced intake, and that combination determines which interventions work.
This answered a question I did not know how to ask. Sending this to two other people who asked me the same thing last week.
From the other side of the consultation, briefly.
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.
KevinCompounds said:Heartburn management on constipation: Gaviscon before bed has been my savior.
Acid reflux and constipation: I developed GERD symptoms around week 4 that I'd never had before. The delayed gastric emptying means food and acid sit in your stomach longer.
Management that works for me: elevate head of bed 6 inches, don't eat within 3 hours of lying down, avoid trigger foods (tomato, citrus, spicy, chocolate), and famotidine 20mg at bedtime. Much better now.
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View ResultsHPLC_Greg said:The escalation order that reflects the mechanism: water and salt first, then soluble fiber, then magnesium or an osmotic agent, then a stimulant only…
Gastroparesis symptoms with constipation: the delayed gastric emptying from GLP-1 agonists can cause early satiety, bloating, and feeling "full" for hours after a small meal.
Tips: eat your protein FIRST (most important macro), then vegetables, then carbs last. Chew thoroughly — 20-30 chews per bite isn't excessive. Avoid carbonated beverages with meals. If symptoms are severe, your doctor may recommend a gastric emptying study.
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