Constipation Treatment with Constella and PEG3350

Mechanism of Action and Efficacy

PEG3350 is an osmotic laxative that works by drawing water into the intestinal lumen, softening stool and increasing bowel movements, as noted by the American Gastroenterological Association 1, 2
Linaclotide (Constella) works through a different mechanism as a guanylate cyclase-C agonist, increasing intestinal fluid secretion and accelerating transit, according to the American Gastroenterological Association 3
The different mechanisms of action make these medications complementary when used together, as suggested by the American Gastroenterological Association 4, 2

The American Gastroenterological Association guidelines recommend PEG3350 as a first-line agent for chronic constipation with strong recommendation and moderate certainty of evidence 4, 2
For patients with inadequate response to a single agent, combination therapy with medications that work through different mechanisms is a logical approach, as recommended by the American Gastroenterological Association 4, 5
The American Gastroenterological Association suggests that combination therapy approaches are acceptable, including the use of PEG3350 in combination with other medications 2, 5

PEG3350 is typically dosed at 17g once daily mixed in 8 ounces of liquid, as recommended by the American Gastroenterological Association 6
When using both medications, start with standard dosing of each and monitor response, as suggested by the American Gastroenterological Association 2, 6

When using both medications, monitor for excessive loose stools or diarrhea, as both medications can cause these side effects, according to the American Gastroenterological Association 2, 5
PEG3350 may cause abdominal distension, flatulence, and nausea, as noted by the American Gastroenterological Association 2, 6

The American Gastroenterological Association recommends starting with PEG3350 alone at 17g daily as first-line therapy, and adding linaclotide (Constella) if response is inadequate after 2-4 weeks 4, 2, 3, 5
Titrate doses of each medication based on response and side effects, as suggested by the American Gastroenterological Association 2, 6
Once optimal response is achieved, continue both medications at effective doses, according to the American Gastroenterological Association 5, 6

For patients with severe constipation or those who have failed multiple single-agent therapies, combination therapy may be particularly beneficial, as recommended by the American Gastroenterological Association 4, 5
PEG3350 is widely available over-the-counter and relatively inexpensive, making it accessible for long-term combination use, as noted by the American Gastroenterological Association 2, 5