Side Effect Guide
Constipation on GLP-1 Medications
Infrequent or difficult bowel movements, often with hard or dry stools
Prevalence
15-25% of patients
Severity
very common
Why it happens
GLP-1 agonists significantly slow gastric emptying and can reduce overall gut motility. Combined with reduced food intake (from appetite suppression), there is less bulk moving through the intestines. Reduced fluid intake can worsen the effect.
Typical timeline
Can begin within the first few weeks of treatment. May persist longer than other GI side effects because reduced food intake continues throughout treatment. Often manageable with dietary adjustments.
Management tips
- Increase water intake to at least 64 oz (2 liters) per day
- Add fiber-rich foods gradually (fruits, vegetables, whole grains)
- Consider a fiber supplement like psyllium husk (Metamucil)
- Stay physically active — regular walking helps stimulate gut motility
- Try a magnesium citrate supplement (consult your doctor first)
- Establish a regular bathroom routine
- Avoid excessive use of stimulant laxatives
When to contact a clinician
If you have not had a bowel movement in more than 3 days, experience severe abdominal pain or bloating, notice blood in your stool, or if over-the-counter remedies are not effective
Commonly associated medications
Questions about constipation
Why does Ozempic cause constipation?
GLP-1 medications slow the movement of food through your entire digestive tract (delayed gastric emptying). Combined with eating less food overall due to appetite suppression, there is less material and less motility to produce regular bowel movements.
What is the best laxative to take with GLP-1 medication?
Osmotic laxatives like MiraLAX (polyethylene glycol) or magnesium citrate are generally well-tolerated. Fiber supplements like psyllium husk can also help. Avoid relying on stimulant laxatives long-term. Always check with your doctor before starting any laxative.
Is constipation from GLP-1 medications permanent?
Not usually. Many patients find improvement with adequate hydration, fiber intake, and physical activity. Your body may also partially adapt over time. If constipation persists, your doctor can recommend specific treatments.
Compare providers before starting treatment
Ask about dose titration, side-effect support, medication source, and follow-up cadence before choosing a clinic.