Linaclotide vs Plecanatide
Written by Aaron CuhaReviewed Sep 2026
The short answer
Two approved peptide pills for constipation, both for long term constipation with no known cause and for IBS where constipation is the main problem. Both act on the same switch in the gut lining without being absorbed into the blood. Plecanatide is marketed as easier to tolerate, and that specific claim has never been tested against linaclotide head to head.
- Linaclotide people
- 0
- Linaclotide nulls
- 0
- Plecanatide people
- 1,337
- Plecanatide nulls
- 0
Dose
Approved medicine. No human dose established for unlabelled uses
Labeled amounts sit on the prescribing information. This page records what trials measured, not a personal dose.
FDA-approved as Linzess for adults with irritable bowel syndrome with constipation, and for adults with long-term constipation that has no known cause. Also approved for children with constipation that has no physical cause. It carries a boxed warning, the FDA's strongest: do not use it in children under two, because of a risk of serious dehydration.
Dose
Approved medicine. No human dose established for unlabelled uses
Labeled amounts sit on the prescribing information. This page records what trials measured, not a personal dose.
FDA-approved on 19 January 2017 under NDA 208745, sold as Trulance. It is for adults with long-term constipation that has no known cause, and for adults with irritable bowel syndrome with constipation. It must not be used in children under six, because of the risk of serious dehydration, and it is avoided in children aged six to under 18. Not approved for weight loss, for leaky gut, or for general gut health.
First-hand reports are counted on each profile and never added together. This page sets two published records side by side. It does not pick a winner.
Column A
LinaclotideLinaclotide (Linzess), guanylate cyclase-C agonist
In 839 adults with irritable bowel syndrome and constipation, 60 percent had less belly pain on it, against 49 percent on a dummy capsule. It is a small peptide taken by mouth that works without being absorbed, acting only on the gut lining. It is approved for constipation.
Column B
PlecanatidePlecanatide (Trulance), uroguanylin analogue and guanylate cyclase-C agonist
A constipation pill approved in 2017, for long-term constipation with no known cause and for IBS with constipation. It is a small protein, 16 building blocks long, that copies one the gut makes itself. In its main study, 20.1 percent of people on 3 mg met the bar for lasting relief, against 12.8 percent on a dummy pill. That is 7.3 more people in every hundred. The claim that it is gentler than linaclotide has never been tested head to head.
Side by side, on the facts we can check
| What we compare | Linaclotide | Plecanatide |
|---|---|---|
| Category | Healing & Recovery | Healing & Recovery |
| FDA status | FDA-approved as Linzess for adults with irritable bowel syndrome with constipation, and for adults with long-term constipation that has no known cause. Also approved for children with constipation that has no physical cause. It carries a boxed warning, the FDA's strongest: do not use it in children under two, because of a risk of serious dehydration. | FDA-approved on 19 January 2017 under NDA 208745, sold as Trulance. It is for adults with long-term constipation that has no known cause, and for adults with irritable bowel syndrome with constipation. It must not be used in children under six, because of the risk of serious dehydration, and it is avoided in children aged six to under 18. Not approved for weight loss, for leaky gut, or for general gut health. |
| Half-life | Not meaningfully described systemically, because absorption is minimal by design. The peptide and its active metabolite act locally in the gut lumen and are degraded there. | Not calculable. The label states that a half-life could not be determined, because systemic absorption is minimal and the drug acts on receptors facing into the gut lumen. |
| Molecular weight | Roughly 1.5 kDa. A 14-amino-acid peptide with three disulfide bonds. | About 1682 Da. Sixteen amino acids. |
| How it works | Linaclotide is a 14 amino acid peptide that switches on guanylate cyclase-C, a receptor on the inner surface of gut lining cells. It copies two of the body's own gut peptides, guanylin and uroguanylin. Switching on the receptor raises a messenger called cyclic GMP, inside and outside the cells. That opens a chloride channel (CFTR), so chloride and bicarbonate flow into the gut, and sodium and water follow. More fluid in the gut makes things move through faster. The cyclic GMP outside the cells is also thought to calm pain nerves in the gut wall. That is the likely reason it eases belly pain in irritable bowel syndrome, apart from its laxative effect. | It switches on a receptor called guanylate cyclase-C on the inner lining of the gut. That sets off a signal inside the gut cells. The signal opens a channel that pushes salt into the gut, and water follows. The result is softer stool that moves faster. The same signal may also calm the nerves that carry gut pain. That is the idea behind the belly pain benefit in IBS. Because it comes from uroguanylin, it works best at the slightly acidic level of the upper small gut. That is the claimed difference from linaclotide. |
| Studies in people | 1 | 2 |
| Evidence | Limited: 1 completed trial, none stating how many people | Strong: 2 completed trials, 1,337 people given it |
| Legal status, US | FDA-approved, prescription only | FDA-approved, prescription only |
Frequently asked questions
What is the difference between Linaclotide and Plecanatide?
Linaclotide: In 839 adults with irritable bowel syndrome and constipation, 60 percent had less belly pain on it, against 49 percent on a dummy capsule. It is a small peptide taken by mouth that works without being absorbed, acting only on the gut lining. It is approved for constipation. Plecanatide: A constipation pill approved in 2017, for long-term constipation with no known cause and for IBS with constipation. It is a small protein, 16 building blocks long, that copies one the gut makes itself. In its main study, 20.1 percent of people on 3 mg met the bar for lasting relief, against 12.8 percent on a dummy pill. That is 7.3 more people in every hundred. The claim that it is gentler than linaclotide has never been tested head to head.
Which has stronger research evidence, Linaclotide or Plecanatide?
Each compound gets a band worked out from facts we counted, with the math shown. Linaclotide is Limited (1 completed trial, none stating how many people). Plecanatide is Strong (2 completed trials, 1,337 people given it). That counts how much has been done in people. It does not rate whether either one works, and neither one is called the winner.
Are Linaclotide and Plecanatide FDA-approved?
Linaclotide: FDA-approved as Linzess for adults with irritable bowel syndrome with constipation, and for adults with long-term constipation that has no known cause. Also approved for children with constipation that has no physical cause. It carries a boxed warning, the FDA's strongest: do not use it in children under two, because of a risk of serious dehydration.. Plecanatide: FDA-approved on 19 January 2017 under NDA 208745, sold as Trulance. It is for adults with long-term constipation that has no known cause, and for adults with irritable bowel syndrome with constipation. It must not be used in children under six, because of the risk of serious dehydration, and it is avoided in children aged six to under 18. Not approved for weight loss, for leaky gut, or for general gut health..
Reviewed Sep 2026. This page puts two published records side by side. It is for learning, and it is not medical advice. When this site shows a dose, it is the dose a trial or a clinic actually used, or what people say they did, with the source attached. None of it tells you what to take.