GLP-1 Constipation Protocol: A Doctor's Step-by-Step Guide
GLP-1 Constipation Protocol: A Doctor's Step-by-Step Guide
By Dr. Onikepe Adegbola, MD PhD — Johns Hopkins-trained physician-scientist
Constipation affects 20-30% of GLP-1 users and is the #1 reason patients want to quit these medications. Slowed gastric emptying + reduced food intake + dehydration = the perfect constipation trifecta. Here's the protocol that works.
Key Takeaways
- GLP-1 constipation is mechanical: less food in = less stool out + slower transit
- Fiber + water is the foundation — but the TYPE of fiber matters
- Magnesium citrate at bedtime is the most effective over-the-counter intervention
- Don't use stimulant laxatives (senna, bisacodyl) chronically — they cause dependency
- Low FODMAP psyllium + GLP-1 enzymes + adequate water = the core protocol
The Protocol (Step by Step)
Step 1: Hydration (Day 1)
Target 80+ oz water daily. Set reminders. GLP-1 suppresses thirst alongside appetite. Dehydrated colon = hard, dry stool.
Step 2: Psyllium Fiber (Day 1-3)
Start psyllium: 1 teaspoon in 8 oz water, 1x daily. Increase to 1 tablespoon after 3 days. ALWAYS with full glass of water.
Step 3: Magnesium Citrate (Day 1)
200-400mg at bedtime. Osmotic action draws water into the colon. Most effective OTC option for GLP-1 constipation.
Step 4: Digestive Enzymes (Every Meal)
GLP-1 Digestive Enzyme Companion — complete food breakdown = less undigested material slowing transit.
Step 5: Movement (Daily)
20-30 minute walk, especially after breakfast. Physical movement stimulates colonic motility.
Step 6: Coffee (Morning)
Coffee is a natural prokinetic. One cup in the morning stimulates the gastrocolic reflex.
Step 7: Probiotics (Daily)
Multi-strain GI probiotic — B. lactis BB-12 specifically improves transit time.
When to Escalate
If no BM for 3+ days despite the above: polyethylene glycol (Miralax) 17g daily until resolved. If no improvement in 1 week, contact your prescriber — dose reduction may be needed.
See our Ozempic constipation guide and fiber guide.
This article is educational only. Severe constipation on GLP-1 requires medical evaluation to rule out intestinal obstruction.
