From the Guidelines
Lubiprostone activates the CIC-2 chloride channel. This medication works by increasing chloride secretion into the intestinal lumen, which leads to increased intestinal fluid secretion and enhanced intestinal motility 1. When lubiprostone activates CIC-2 channels, the resulting increase in fluid in the intestinal lumen softens stool and accelerates intestinal transit time.
Key Points
- Lubiprostone is typically prescribed for chronic idiopathic constipation and irritable bowel syndrome with constipation (IBS-C) at doses of 8-24 mcg twice daily 1.
- The medication is a prostaglandin E1 derivative that specifically targets CIC-2 chloride channels without significant systemic absorption, which helps minimize side effects 1.
- Common side effects include nausea, which is dose-dependent and can be mitigated by taking the medication with food and water 1.
- The medication's mechanism of action through CIC-2 activation represents a targeted approach to treating constipation by addressing the underlying fluid secretion issues in the intestine rather than simply stimulating motility.
Important Considerations
- Individuals with moderate or severe hepatic insufficiency should receive a lower dose of lubiprostone (ie, 8μg twice daily) 1.
- The medication is contraindicated in individuals with known or suspected mechanical GI obstruction 1.
From the FDA Drug Label
Lubiprostone is a locally acting chloride channel activator that enhances a chloride-rich intestinal fluid secretion without altering sodium and potassium concentrations in the serum. Lubiprostone acts by specifically activating ClC-2, which is a normal constituent of the apical membrane of the human intestine, in a protein kinase A–independent fashion Lubiprostone activates ClC-2 2
From the Research
CIC-2 Activation by Lubiprostone
- Lubiprostone activates the type 2 chloride channel (CIC-2) in the apical membrane of the gastrointestinal epithelium, resulting in increased fluid secretion 3, 4.
- The activation of CIC-2 by lubiprostone leads to relief of constipation by increasing chloride and fluid secretion into the intestines 4, 5.
- Studies have shown that lubiprostone improves the number of bowel movements, stool consistency, and global assessment of constipation compared to placebo 3, 4, 6.
Mechanism of Action
- Lubiprostone's mechanism of action involves the activation of CIC-2, which increases chloride and water secretion in the intestines 6, 7.
- The increased fluid secretion softens the stool and promotes bowel movements, providing relief from constipation 3, 4.
Clinical Efficacy
- Clinical trials have demonstrated the efficacy of lubiprostone in treating chronic idiopathic constipation, with significant improvements in spontaneous bowel movements and stool consistency 3, 4, 6.
- Lubiprostone has also been shown to be effective in treating opioid-induced constipation and irritable bowel syndrome with constipation 6.