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Chenodiol
Overview
What is Chenodiol?
Chenodiol is the non-proprietary name for chenodeoxycholic acid, a naturally occurring human bile acid. It is a bitter-tasting white powder consisting of crystalline and amorphous particles freely soluble in methanol, acetone and acetic acid and practically insoluble in water. Its chemical name is 3α, 7α-dihydroxy-5β-cholan-24-oic acid (CHO), it has a molecular weight of 392.58, and its structure is shown below;
Chenodiol film-coated tablets for oral administration contain 250 mg of chenodiol.
Inactive ingredients: pregelatinized starch; silicon dioxide; microcrystalline cellulose, sodium starch glycollate; and magnesium stearate; the thin-film coating contains: opadry YS-2-7035 [consisting of methylcellulose and glycerin] and sodium lauryl sulfate
What does Chenodiol look like?
What are the available doses of Chenodiol?
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What should I talk to my health care provider before I take Chenodiol?
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How should I use Chenodiol?
Chenodiol is indicated for patients with radiolucent stones in well-opacifying gallbladders, in whom selective surgery would be undertaken except for the presence of increased surgical risk due to systemic disease or age. The likelihood of successful dissolution is far greater if the stones are floatable or small. For patients with nonfloatable stones, dissolution is less likely and added weight should be given to the risk that more emergent surgery might result form a delay due to unsuccessful treatment. Safety of use beyond 24 months is not established. Chenodiol will not dissolve calcified (radiopaque) or radiolucent bile pigment stones.
The recommended dose range for Chenodiol is 13 to 16 mg/kg/day in two divided doses, morning and night, starting with 250 mg b.i.d. the first two weeks and increasing by 250 mg/day each week thereafter until the recommended or maximum tolerated dose is reached. If diarrhea occurs during dosage buildup or later in treatment, it usually can be controlled by temporary dosage adjustment until symptoms abate, after which the previous dosage usually is tolerated. Dosage less than 10 mg/kg usually is ineffective and may be associated with increased risk of cholecystectomy, so is not recommended.
The optimal frequency of monitoring liver function tests is not known. It is suggested that serum aminotransferase levels should be monitored monthly for the first three months and every three months thereafter during Chenodiol administration. Under NCGS guidelines, if a minor, usually transient elevations (1 ½ to3 three times the upper limit of normal) persisted longer than three to six months. Chenodiol was discontinued and resumed only after the aminotransferase level returned to normal; however, allowing the elevations to persist over such an interval is not know to be safe. Elevations over three times the upper limit of normal require immediate discontinuation of Chenodiol and usually reoccur on challenge.
Serum cholesterol should be monitored at six months intervals. It may be advisable to discontinue Chenodiol if cholesterol rises above the acceptable age-adjusted limit for given patient.
Oral cholecystograms or ultrasonograms are recommend at six to nine month intervals to monitor response. Complete dissolutions should be confirmed by a repeat test after one to three months continued Chenodiol administration. Most patients who eventually achieve complete dissolution will show partial (or complete) dissolution at the first on-treatment test. If partial dissolution is not seen by nine to 12 months, the likelihood of success of treating loner is greatly reduced; Chenodiol should be discontinued if there is no response by 18 months. Safety of use beyond 24 months is not established.
Stone recurrence can be expected within five years in 50% of cases. After confirmed dissolution, treatment generally should be stopped. Serial cholecystograms or ultrasonograms are recommended to monitor for recurrence, keeping in mind that radiolucency and gallbladder function should be established before starting another course of Chenodiol. A prophylactic doses is not established; reduced doses cannot be recommended; stones have recurred on 500 mg/day. Low cholesterol or carbohydrate diets, and dietary bran, have been reported to reduce biliary cholesterol; maintenance of reduced weight is recommended to forestall stone recurrence.
What interacts with Chenodiol?
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What are the warnings of Chenodiol?
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What are the precautions of Chenodiol?
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What are the side effects of Chenodiol?
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What should I look out for while using Chenodiol?
Chenodiol is contraindicated in the presence of know hepatocyte dysfunction or bile ductal abnormalities such as intrahepatic cholestasis, primary biliary cirrhosis or sclerosing cholangitits (see Warnings); a gallbladder confirmed as nonvisualizing after two consecutive single doses of dye; radiopaque stones; or gallstone complications or compelling reasons for gallbladder surgery including unremitting acute cholecystitis, cholangitis, biliary obstruction, gallstone pancreatitis, or biliary gastrointestinal fistula.
Pregnancy Category X:
Chenodiol may cause fetal harm when administered to a pregnant woman. Serious hepatic, renal and adrenal lesions occurred in fetuses of female Rhesus monkeys given 60 to 90 mg/kg/day (4 to 6 times the maximum recommended human dose, MRHD) from day 21 to day 45 of pregnancy. Hepatic lesions also occurred in neonatal baboons whose mothers had received 18 to 38 mg/kg ( 1 to 2 times the MRHD), all during pregnancy. Fetal malformations were not observed. Neither fetal liver damage nor fetal abnormalities occurred in reproduction studies in rats and hamsters. No human data are available at this time. Chenodiol is contraindicated in women who are or may become pregnant. If this drug is used during pregnancy, or if the patient becomes pregnant while taking this drug, the patient should be apprised of the potential hazard to the fetus.
Safe use of chenodiol depends upon selection of patients without pre-existing liver disease and upon faithful monitoring of serum aminotransferase levels to detect drug-induced liver toxicity. Aminotransferase elevations over three times the upper limit of normal have required discontinuation of chenodiol in 2% to 3% of patients. Although clinical and biopsy studies have not shown fulminant lesions, the possibility remains that an occasional patient may develop serious hepatic disease. Three patients with biochemical and histologic pictures of chronic active hepatitis while on chenodiol, 375 mg/day or 750 mg/day, have been reported. The biochemical abnormalities returned spontaneously to normal in two of the patients within 13 and 17 months; and after 17 months’ treatment with prednisone in the third. Follow-up biopsies were not done; and the causal relationship of the drug could not be determined. Another biopsied patient was terminated from therapy because of elevated aminotransferase levels and a liver biopsy was interpreted as showing active drug hepatitis.
One patient with sclerosing cholangitis, biliary cirrhosis and history of jaundice died during chenodiol treatment for hepatic duct stones. Before treatment, serum aminotransferase and alkaline phosphate levels were over twice the upper limit of normal; within one month they rose to over 10 time normal. Chenodiol was discontinued at seven weeks, when the patient was hospitalized with advanced hepatic failure and E. coli peritonitis; death ensued at the eight week. A contribution of chenodiol to the fatal outcome could not be ruled out.
Epidemiologic studies suggest that bile acids might contribute to human colon cancer, but direct evidence is lacking. Bile acids, including chenodiol and lithocholic acid, have no carcinogenic potential in animal models, but have been shown to increase the number of tumors when administered with certain know carcinogens. The possibility that chenodiol therapy might contribute to colon cancer in otherwise susceptible individuals cannot be ruled out.
What might happen if I take too much Chenodiol?
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How should I store and handle Chenodiol?
Store at controlled room temperature 20° to 25°C (68° to 77°F) [see USP] .Chenodiol is available as white film-coated 250 mg tablets imprinted “MP” on one side and "250" on the other in bottles of 100, NDC 0722-7121-01.Store at 20C to 25C (68F to 77F) [see USP Controlled Room Temperature]. Dispense in a tight container.Manufactured by:Nexgen Pharma, Inc.Irvine, CA 92614-6502Rev. 08/09Chenodiol is available as white film-coated 250 mg tablets imprinted “MP” on one side and "250" on the other in bottles of 100, NDC 0722-7121-01.Store at 20C to 25C (68F to 77F) [see USP Controlled Room Temperature]. Dispense in a tight container.Manufactured by:Nexgen Pharma, Inc.Irvine, CA 92614-6502Rev. 08/09Chenodiol is available as white film-coated 250 mg tablets imprinted “MP” on one side and "250" on the other in bottles of 100, NDC 0722-7121-01.Store at 20C to 25C (68F to 77F) [see USP Controlled Room Temperature]. Dispense in a tight container.Manufactured by:Nexgen Pharma, Inc.Irvine, CA 92614-6502Rev. 08/09Chenodiol is available as white film-coated 250 mg tablets imprinted “MP” on one side and "250" on the other in bottles of 100, NDC 0722-7121-01.Store at 20C to 25C (68F to 77F) [see USP Controlled Room Temperature]. Dispense in a tight container.Manufactured by:Nexgen Pharma, Inc.Irvine, CA 92614-6502Rev. 08/09Chenodiol is available as white film-coated 250 mg tablets imprinted “MP” on one side and "250" on the other in bottles of 100, NDC 0722-7121-01.Store at 20C to 25C (68F to 77F) [see USP Controlled Room Temperature]. Dispense in a tight container.Manufactured by:Nexgen Pharma, Inc.Irvine, CA 92614-6502Rev. 08/09Chenodiol is available as white film-coated 250 mg tablets imprinted “MP” on one side and "250" on the other in bottles of 100, NDC 0722-7121-01.Store at 20C to 25C (68F to 77F) [see USP Controlled Room Temperature]. Dispense in a tight container.Manufactured by:Nexgen Pharma, Inc.Irvine, CA 92614-6502Rev. 08/09Chenodiol is available as white film-coated 250 mg tablets imprinted “MP” on one side and "250" on the other in bottles of 100, NDC 0722-7121-01.Store at 20C to 25C (68F to 77F) [see USP Controlled Room Temperature]. Dispense in a tight container.Manufactured by:Nexgen Pharma, Inc.Irvine, CA 92614-6502Rev. 08/09
Clinical Information
Chemical Structure
No Image foundClinical Pharmacology
At therapeutic doses, chenodiol suppresses hepatic synthesis of both cholesterol and cholic acid, gradually replacing the latter and its metabolite, deoxycholic acid in an expanded bile acid pool. These actions contribute to biliary cholesterol desaturation and gradual dissolution of radiolucent cholesterol gallstones in the presence of a gall-bladder visualized by oral cholecystography. Chenodiol has no effect on radiopaque (calcified) gallstones or on radiolucent bile pigment stones.
Chenodiol is well absorbed from the small intestine and taken up by the liver where it is converted to its taurine and glycine conjugates and secreted in bile. Owing to 60 % to 80% first-pass hepatic clearance, the body pool of chenodiol resides mainly in the enterohepatic circulation; serum and urinary bile acid levels are not significantly affected during chenodiol therapy.
At steady-state, an amount of chenodiol near the daily dose escapes to the colon and is converted by bacterial action to lithocholic acid. About 80% of the lithocholate is excreted in the feces; the remainder is absorbed and converted in the liver to its poorly absorbed sulfolithocholyl conjugates. During chenodiol therapy there is only a minor increase in biliary lithocholate, while fecal bile acids are increased three- to fourfold.
Chenodiol is unequivocally hepatotoxic in many animal species, including sub-human primates at doses close to the human dose. Although the theoretical cause is the metabolite, lithocholic acid, an established hepatotoxin, and man has an efficient mechanism for sulfating and eliminating this substance, there is some evidence that the demonstrated hepatotoxicity is partly due to chenodiol . The hepatotoxicity of lithocholic acid is characterized biochemically and morphologically as cholestatic.
Man has the capacity to form sulfate conjugates of lithocholic acid. Variation in this capacity among individuals has not been well established and a recent published report suggests that patients who develop chenodiol-induced serum aminotransferase elevations are poor sulfators of lithocholic acid (
.
General Clinical Results:
Observed stone dissolution rates achieved with chenodiol treatment are higher in subgroups having certain pretreatment characteristics. In the NCGS, patients with small {less than 15 mm in diameter} radiolucent stones, the observed rate of complete dissolution was approximately 20% on 750 mg/day. In the uncontrolled trails using 13 to 16 mg/kg/day doses of chenodiol, the rates of complete dissolution for small radiolucent stones ranged from 42% to 60%. Even higher dissolution rates have been observed in patients with small floatable stones. (See below). Some obese patients and occasional normal weight patients fail to achieve bile desaturation even with doses of chenodiol up to 19 mg/kg/day for unknown reasons. Although dissolution is generally higher with increased dosage of chenodiol, doses that are too low are associated with increased cholecystectomy rates (see ).
Stones have recurred within five years in about 50% of patients following complete confirmed dissolutions. Although retreatment with chenodiol has proven successful in dissolving some newly formed stones, the indications for and safety of retreatment are not well defined. Serum aminotransferase elevations and diarrhea have been notable in all clinical trials and are dose-related (refer to sections for full information).
Floatable versus Nonfloatable Stones
In the NCGS in patients with nonfloatable stones, chenodiol produced no reduction in biliary pain and showed a tendency to increase the cholecystectomy rate (8% versus 4%). This finding was more pronounced with doses of chenodiol below 10 mg/kg. The subgroup of patients with nonfloatable stones and a history of biliary pain had the highest rates of cholecystectomy and aminotransferase elevations during chenodiol treatment. Except for the NCGS subgroup with pretreatment biliary pain, dose-related aminotransferase elevations and diarrhea have occurred with equal frequency in patients with floatable or nonfloatable stones. In the uncontrolled clinical trial mentioned above, 27% of the patients with nonfloatable stones (n = 59) had complete confirmed dissolutions, including 35% with small (less than 15 mm)(n= 40) and only 11% with large, nonfloatable stones (n= 19).
Of 916 patients enrolled NCGS, 17.6% had stones seen in upright form (horizontal X-ray beam) to float in the dye-laden bile during oral cholecystography using iopanoic acid. Other investigators report similar findings. Floatable stones are not detected by ultrasonography in the absence for dye. Chemical analysis has shown floatable stones to be essentially pure cholesterol).
Other Radiographic and Laboratory Features:
PATIENT SELECTION
Evaluation of Surgical Risk;
Women in good health, or having only moderate systemic disease, under 49 years of age have the lowest rate (0.054%); men in all categories have a surgical mortality rate twice that of women; common duct exploration quadruples the rates in all categories; the rates rise with each decade of life and increase tenfold or more in all categories with severe or extreme systemic disease.
Relatively young patients requiring treatment might be better treated by surgery than with Chenodiol, because treatment with chenodiol, even if successful, is associated with a high rate of recurrence, The long-term consequences of repeated courses of chenodiol in terms of liver toxicity, neoplasia and elevated cholesterol levels are not know.
Watchful waiting has the advantage that no therapy may ever be required. For patients with silent or minimally symptomatic stones, the rate of moderate to severe symptoms or gallstone complications is estimated to be between 2% and 6% per year, leading to a cumulative rate of 7% and 27%in five years. Presumably the rate is higher for patients already having symptoms.
Non-Clinical Toxicology
Chenodiol is contraindicated in the presence of know hepatocyte dysfunction or bile ductal abnormalities such as intrahepatic cholestasis, primary biliary cirrhosis or sclerosing cholangitits (see Warnings); a gallbladder confirmed as nonvisualizing after two consecutive single doses of dye; radiopaque stones; or gallstone complications or compelling reasons for gallbladder surgery including unremitting acute cholecystitis, cholangitis, biliary obstruction, gallstone pancreatitis, or biliary gastrointestinal fistula.Pregnancy Category X:
Chenodiol may cause fetal harm when administered to a pregnant woman. Serious hepatic, renal and adrenal lesions occurred in fetuses of female Rhesus monkeys given 60 to 90 mg/kg/day (4 to 6 times the maximum recommended human dose, MRHD) from day 21 to day 45 of pregnancy. Hepatic lesions also occurred in neonatal baboons whose mothers had received 18 to 38 mg/kg ( 1 to 2 times the MRHD), all during pregnancy. Fetal malformations were not observed. Neither fetal liver damage nor fetal abnormalities occurred in reproduction studies in rats and hamsters. No human data are available at this time. Chenodiol is contraindicated in women who are or may become pregnant. If this drug is used during pregnancy, or if the patient becomes pregnant while taking this drug, the patient should be apprised of the potential hazard to the fetus.
Safe use of chenodiol depends upon selection of patients without pre-existing liver disease and upon faithful monitoring of serum aminotransferase levels to detect drug-induced liver toxicity. Aminotransferase elevations over three times the upper limit of normal have required discontinuation of chenodiol in 2% to 3% of patients. Although clinical and biopsy studies have not shown fulminant lesions, the possibility remains that an occasional patient may develop serious hepatic disease. Three patients with biochemical and histologic pictures of chronic active hepatitis while on chenodiol, 375 mg/day or 750 mg/day, have been reported. The biochemical abnormalities returned spontaneously to normal in two of the patients within 13 and 17 months; and after 17 months’ treatment with prednisone in the third. Follow-up biopsies were not done; and the causal relationship of the drug could not be determined. Another biopsied patient was terminated from therapy because of elevated aminotransferase levels and a liver biopsy was interpreted as showing active drug hepatitis.
One patient with sclerosing cholangitis, biliary cirrhosis and history of jaundice died during chenodiol treatment for hepatic duct stones. Before treatment, serum aminotransferase and alkaline phosphate levels were over twice the upper limit of normal; within one month they rose to over 10 time normal. Chenodiol was discontinued at seven weeks, when the patient was hospitalized with advanced hepatic failure and E. coli peritonitis; death ensued at the eight week. A contribution of chenodiol to the fatal outcome could not be ruled out.
Epidemiologic studies suggest that bile acids might contribute to human colon cancer, but direct evidence is lacking. Bile acids, including chenodiol and lithocholic acid, have no carcinogenic potential in animal models, but have been shown to increase the number of tumors when administered with certain know carcinogens. The possibility that chenodiol therapy might contribute to colon cancer in otherwise susceptible individuals cannot be ruled out.
Bile acid sequestering agents, such as cholestyramine and colestipol, may interfere with the action of Chenodiol by reducing its absorption. Aluminum-based antacids have been shown to absorb bile acids in vitro and may be expected to interfere with Chenodiol in the same manner as the sequestering agents. Estrogen, oral contraceptive and collaborate (and perhaps other lipid-lowering drugs) increase biliary cholesterol secretion, and the incidence of cholesterol gallstones hence may counteract the effectiveness of Chenodiol.
Due to its hepatotoxicity, chenodiol can affect the pharmacodynamics of coumarin and its derivatives, causing unexpected prolongation of the prothrombin time and hemorrahages. Patients on concommitant therapy with chenodiol and coumarin or its derivatives should be monitored carefully. If prolongation of prothrombin time is observed, the coumarin dosage should be readjusted to give a prothrombin time 1½ to 2 times normal. If necessary chenodiol should be discontinued.
Patients should be counseled on the importance of periodic visits for liver function tests and oral cholecystograms (or ultrasonograms) for monitoring stone dissolution; they should be made aware of the symptoms of gallstone complications and be warned to report immediately such symptoms to the physician. Patients should be instructed on ways to facilitate faithful compliance with the dosage regimen throughout the usual long term of therapy, and on temporary doses reduction if episodes of diarrhea occur.
Hepatobiliary:
see
Morphologic studies of liver biopsies taken before and after 9 and 24 months of treatment with chenodiol have shown that 63% of the patients prior to chenodiol treatment had evidence of intrahepatic cholestasis. Almost all pretreatment patients had electron microscopic abnormalities. By the ninth month of treatment, reexamination of two-thirds of the patients showed an 89% incidence of the signs of intrahepatic cholestasis. Two of 89 patients at the ninth month had lithocholate-like lesions in the canalicular membrane, although there were not clinical enzyme abnormalities in the face of continued treatment and no change in Type 2 light microscopic parameters.
Increased Cholecystectomy Rate
Gastrointestinal:
Discontinuation of chenodiol because of failure to control diarrhea is to be expected in approximately 3% of patients treated. Steady epigastric pain with nausea typical of lithiasis (biliary colic) usually is easily distinguishable from the crampy abdominal pain of drug-induced diarrhea.
Other less frequent, gastrointestinal side effects reported include urgency, cramps, heartburn, constipation, nausea, and vomiting, anorexic, epigastric distress, dyspepsis, flatulence and nonspecific abdominal pain.
Serum Lipids:
Hematologic:
Reference
This information is obtained from the National Institute of Health's Standard Packaging Label drug database.
"https://dailymed.nlm.nih.gov/dailymed/"
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