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Information about Trimethobenzamide

Trimethobenzamide is an orally available, antiemetic agent used in the therapy of nausea and vomiting associated with medications and gastrointestinal, viral and other illnesses. 


Liver safety of Trimethobenzamide

Trimethobenzamide has not been linked convincingly to elevations in serum enzymes during therapy or to cases of clinically apparent liver injury with jaundice.

Mechanism of action of Trimethobenzamide

Trimethobenzamide (trye meth” oh ben’ za mide) is a benzamide used to prevent nausea and vomiting.  Its mechanism of action is uncertain, but it is believed to act directly on the central chemoreceptor nausea trigger zone of the medulla oblongata of the brain.  It has weak antihistaminic activity, but does not appear to act via serotonin or dopamine pathways. 

FDA approval information for Trimethobenzamide

Trimethobenzamide was approved for use in the United States in 1974 and is widely used in therapy of nausea, vomiting caused by gastroenteritis, medications and other illnesses.  Trimethobenzamide is available as 300 mg capsules in generic forms and under the brand name Tigan.  It is also available as a solution for injection (100 mg/mL). Trimethobenzamide used to be available also as suppositories, but this formulation was discontinued due to lack of efficacy.  The typical oral dose of trimethobenzamide for in adults is 300 mg three or four times a day as needed, usually for short periods only.  Intravenous formulations are used for therapy of postoperative nausea and vomiting

Side effects of Trimethobenzamide

Common side effects include drowsiness, dizziness, headache, fatigue, diarrhea and polyuria.  Rare side effects include hypersensitivity reactions, disorientation coma and seizures.

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


Cannabinoid Receptor Agonists

Serotonin 5-HT3 Receptor Antagonists

Substance P/Neurokinin 1 Receptor Antagonists


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


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


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