Content reviewed by clinical research staff
Evidence graded using the PeptideScholar A-D system
Linaclotide
AFDA ApprovedGuanylate cyclase-C agonist · 14 amino acids · Brand: Linzess, Constella
Linaclotide is a guanylate cyclase-C (GC-C) receptor agonist approved by the FDA for irritable bowel syndrome with constipation (IBS-C) and chronic idiopathic constipation (CIC). It increases intestinal fluid secretion and accelerates transit without being absorbed systemically.
Mechanism of Action
Binds to GC-C receptors on intestinal epithelial cells, increasing intracellular cGMP. This opens CFTR chloride channels, increasing luminal chloride and bicarbonate secretion and water influx. Also reduces visceral hypersensitivity via cGMP-mediated inhibition of pain-signaling afferents.
Benefits
- Significant improvement in abdominal pain and bowel habits in IBS-C[1]
- Increases complete spontaneous bowel movements in CIC
- Minimal systemic absorption (acts locally in gut)
- Approved for both adult and pediatric (6-17 years) IBS-C
Side Effects
- Diarrhea (most common; dose-dependent, usually early)
- Abdominal pain and distension[1]
- Flatulence
- Headache
- Severe diarrhea requiring discontinuation (rare)
Ready to Discuss Linaclotide with a Doctor?
Linaclotide is FDA-approved and available by prescription. Licensed telehealth providers can evaluate if it's right for you.
Find a Prescribing ProviderTelehealth consultations available in most states
PeptideScholar may receive compensation from provider referrals. This does not influence our editorial content.
Linaclotide in PeptideScholar's current approved-treatment dataset
Linaclotide is currently modeled on this site as an approved treatment path for: Irritable bowel syndrome with constipation (IBS-C) in adults and children aged 6-17; chronic idiopathic constipation (CIC) in adults. Brand names in the current dataset: Linzess, Constella.
Research & Evidence
Linaclotide for irritable bowel syndrome with constipation: a 26-week, randomized, double-blind, placebo-controlled trial to evaluate efficacy and safety.
Linaclotide 290 mcg significantly improved abdominal pain, bloating, and bowel habits vs placebo over 26 weeks in IBS-C patients
PMID: 22986437References
- 1. Linaclotide for irritable bowel syndrome with constipation: a 26-week, randomized, double-blind, placebo-controlled trial to evaluate efficacy and safety.. Am J Gastroenterol, 2012. “Linaclotide 290 mcg significantly improved abdominal pain, bloating, and bowel habits vs placebo over 26 weeks in IBS-C patients” [PMID: 22986437]
Recommended Resources
The Peptide Protocols Handbook
Evidence-based reference guide covering mechanisms, research, and clinical applications.
View on AmazonThird-Party Peptide Testing
Independent lab analysis to verify peptide purity and authenticity.
Learn MoreLinks may be affiliate links. See our disclosure.
GLP-1 Support Essentials
Products to help manage side effects and optimize outcomes during treatment.
LMNT Electrolyte Packets
Sodium-focused electrolytes to prevent dehydration and fatigue common in early GLP-1 therapy.
High-Protein Shakes (30g)
Convenient protein shakes to maintain muscle mass on reduced GLP-1 caloric intake.
Metamucil Fiber Supplement
Soluble fiber powder to manage constipation and GI side effects during GLP-1 treatment.
Vitamin B12 (Methylcobalamin 1000mcg)
GLP-1 agonists can reduce B12 absorption over time — methylcobalamin is the most bioavailable form.
Ginger Chews for Nausea
Natural nausea relief for the dose-escalation adjustment period, particularly weeks 1–4.
Unflavored Whey Protein Isolate
Preserve lean mass without excess carbs or calories when appetite is suppressed.
Amazon affiliate links — we may earn a small commission at no extra cost to you. See our disclosure.
Progress Tracking Tools
Monitor weight, body composition, and nutrition to maximize results.
Smart WiFi Body Scale
Tracks BMI, body fat %, and muscle mass — essential for monitoring GLP-1 progress over time.
Digital Kitchen Food Scale
Precise gram-level portion tracking helps maximize weight loss results on GLP-1 therapy.
Protein Shaker Bottle Set
Leak-proof mixing bottles for protein shakes — supports consistent protein intake on a smaller appetite.
Amazon affiliate links — we may earn a small commission at no extra cost to you. See our disclosure.
Recommended Reading
Books covering peptide science, longevity research, and biohacking frameworks.
The Peptide Protocols
Comprehensive reference for peptide mechanisms, dosing research, and clinical applications.
Boundless by Ben Greenfield
Covers peptides, nootropics, hormones, and longevity strategies in an optimization framework.
Lifespan by David Sinclair
Evidence-based deep-dive into aging science, directly relevant to longevity peptide research.
The Longevity Paradox
Gut-centric aging research with diet and supplementation protocols for extending healthspan.
Amazon affiliate links — we may earn a small commission at no extra cost to you. See our disclosure.
Linaclotide FAQ
Medical Disclaimer
This content is for informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment recommendations.
Always consult a qualified healthcare provider before starting, stopping, or modifying any treatment. Do not disregard professional medical advice based on information found on this site.
No claims of therapeutic efficacy are made for substances that are not FDA-approved for the discussed indications. Research citations reflect published findings and do not imply endorsement.
Related Peptides
Get peptide research updates
Weekly evidence summaries and regulatory alerts.
No spam. Unsubscribe anytime.