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Alosetron

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Information about Alosetron

Alosetron (al oh’ se tron) is a 5-HT3 receptor blocker, but was developed and used largely for management of diarrhea-predominant irritable bowel syndrome rather than as an antiemetic. 

FDA approval information for Alosetron

Its introduction in the 1990s however, was followed by cases of severe, even life-threatening, constipation which led to its withdrawal in 2000.  Alosetron was reintroduced in 2002 with restrictions on its availability and limitation to women with severe diarrhea-predominant irritable bowel syndrome. 

Dosage and administration for Alosetron

Alosetron is available as 0.5 and 1.0 mg tablets generically and under the brand name Lotronex.  The typical initial dose in adults is 0.5 mg twice daily, which can be increased to 1 mg twice daily if it is well tolerated. 

Side effects of Alosetron

Side effects include abdominal pain and constipation, which can be severe resulting in intestinal obstruction, ileus, impaction and ischemic colitis. 

Monitoring

Patients treated with alosetron must be enrolled in a prescribing program and have regular monitoring for side effects.

Antidiarrheal agents

Antidiarrheal agents include bulk forming agents, hydroscopic agents, bile acid resins, bismuth, inhibitors of intestinal motility, non-absorbed antibiotics and hormones. Bulk forming agents include methylcellulose; hydroscopic agents include pectin and kaolin; bile acid resins are cholestyramine, colestipol and colesevalam; inhibitors of intestinal motility include opioids such as diphenoxylate and loperamide. Antibiotics include rifamycin and rifaximin which are non-absorbed and are used for travelers' diarrhea. Hormones with antidiarrheal activity include octretide and somatostatin. Most antidiarrheal agents are active locally in the small intestine and colon and are largely not absorbed. Some, however, have been implicated in rare causes of liver injury (senna, cascara, cholestyramine). Telotristat is a relatively new agent that inhibits the synthesis of serotonin and is used specifically for the diarrhea of carcinoid syndrome.

Antiemetics are a diverse group of medications that act at different points in the pathways that regulate nausea and vomiting. These include antihistamines, anticholinergic agents, phenothiazines, serotonin type 3 receptor blockers, centrally acting benzamides, cannabinoid receptor agonists, substance P antagonists and miscellaneous.

Anticholinergic Agents

Antihistamines

Cannabinoid Receptor Agonists

Serotonin 5-HT3 Receptor Antagonists

Substance P/Neurokinin 1 Receptor Antagonists

Miscellaneous

Acid peptic disease/antiulcer agents that include antacids, the histamine type 2 receptor blockers (H2 blockers), and the proton pump inhibitors (PPIs). These agents are some of the most commonly taken medications and are very well tolerated, most being available both by prescription and over-the-counter. While many of these drugs are approved for use in duodenal and gastric ulcer disease, their major use is for acid reflux and indigestion.

Histamine H2 Receptor Antagonists (H2 Blockers) Cimetidine, Famotidine, Nizatidine, Ranitidine

Proton Pump Inhibitors

Cathartics, laxatives or agents for constipation include bulk forming agents, osmotic agents, stool wetting agents, nonspecific stimulants, prokinetic agents and agents that increase fluid secretion. Many of these therapies are not systemically absorbed and none are considered particularly hepatotoxic. Naldemedine and naloxegol are opioid antagonists and are used to treat the constipation associated with opioid use.

Inflammatory bowel disease encompasses several disorders, most commonly ulcerative colitis and Crohn colitis. Agents can be classified as 5-aminosalicyclic acid (5-ASA) based agents, immunosuppressive drugs, antitumor necrosis factor agents, corticosteroids, antibiotics and miscellaneous.

5-Aminosalicyclic Acid (5-ASA) Derivatives

Immunosuppressive Agents

Tumor Necrosis Factor Antagonists

Miscellaneous

Irritable Bowel Syndrome Agents Antimuscarinics/Antispasmodics [See Anticholinergic agents

Prokinetic Agents - See Serotonin 5-ht4 receptor agonists Alosetron, Cisapride, Domperidone, Linaclotide, Lubiprostone, Metoclopramide, Plecanatide, Prucalopride, Tegaserod

Other

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Latest research (Pubmed)

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