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  • Title: [Pharmacological and clinical profile of linaclotide (Linzess®), a novel therapeutic agent for irritable bowel syndrome with constipation and chronic constipation].
    Author: Keto Y, Kosako M.
    Journal: Nihon Yakurigaku Zasshi; 2019; 153(6):289-298. PubMed ID: 31178535.
    Abstract:
    Linaclotide (Linzess® tablets 0.25 mg) is a guanylate cyclase-C (GC-C) agonist with high selectivity and binding affinity to GC-C. In Japan, linaclotide was approved for 〝irritable bowel syndrome with constipation (IBS-C)〟 in December 2016 and 〝chronic constipation (CC) (excluding constipation due to organic disease)〟 in August 2018. Non-clinical studies demonstrated that linaclotide binding to GC-C increases intracellular cyclic guanosine monophosphate (cGMP), resulting in increased fluid secretion and gastrointestinal transit. In rats with colonic hyperalgesia, but not in normal rats, linaclotide suppressed the visceral nociceptive response, mediated by increased submucosal cGMP. In clinical studies in Japan, improvements were observed in the responder rates for global assessment of IBS symptom relief, complete spontaneous bowel movements in patients with IBS-C, and the frequency of spontaneous bowel movement in patients with CC, which were maintained during long-term treatment. Additionally, abdominal bloating, which has been associated with lower quality of life (QOL) and lower satisfaction with other approved therapies, and IBS QOL were improved throughout treatment with linaclotide. Diarrhea, a consequence of linaclotide's mechanism of action, was observed during the clinical studies, but was generally controllable by decreasing the linaclotide dose. No drug resistance was observed during the clinical studies, unlike some other approved agents. These results of non-clinical and clinical studies demonstrate that linaclotide can improve constipation, various abdominal symptoms, and QOL with a favorable safety profile in patients with IBS-C and CC.
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