Interactions between Chloral hydrate and Dextromethorphan / phenylephrine / thonzylamine
1 drug interaction and 35 additional warnings found for the following 2 drugs:
- chloral hydrate
- dextromethorphan/phenylephrine/thonzylamine
Drug interactions
Moderate drug interactions
Moderate:
chloral hydrate dextromethorphan
Applies to: chloral hydrate and dextromethorphan / phenylephrine / thonzylamine
Monitor
Central nervous system- and/or respiratory-depressant effects may be additively or synergistically increased in patients taking multiple drugs that cause these effects, especially in elderly or debilitated patients. Sedation and impairment of attention, judgment, thinking, and psychomotor skills may increase.
Management
During concomitant use of these drugs, patients should be monitored for potentially excessive or prolonged CNS and respiratory depression. Cautious dosage titration may be required, particularly at treatment initiation. Ambulatory patients should be counseled to avoid hazardous activities requiring mental alertness and motor coordination until they know how these agents affect them, and to notify their physician if they experience excessive or prolonged CNS effects that interfere with their normal activities.
References (36)
- Hamilton MJ, Bush M, Smith P, Peck AW (1982) "The effects of bupropion, a new antidepressant drug, and diazepam, and their interaction in man." Br J Clin Pharmacol, 14, p. 791-7
- Stambaugh JE, Lane C (1983) "Analgesic efficacy and pharmacokinetic evaluation of meperidine and hydroxyzine, alone and in combination." Cancer Invest, 1, p. 111-7
- Sotaniemi EA, Anttila M, Rautio A, et al. (1981) "Propranolol and sotalol metabolism after a drinking party." Clin Pharmacol Ther, 29, p. 705-10
- Grabowski BS, Cady WJ, Young WW, Emery JF (1980) "Effects of acute alcohol administration on propranolol absorption." Int J Clin Pharmacol Ther Toxicol, 18, p. 317-9
- Lemberger L, Rowe H, Bosomworth JC, Tenbarge JB, Bergstrom RF (1988) "The effect of fluoxetine on the pharmacokinetics and psychomotor responses of diazepam." Clin Pharmacol Ther, 43, p. 412-9
- MacLeod SM, Giles HG, Patzalek G, Thiessen JJ, Sellers EM (1977) "Diazepam actions and plasma concentrations following ethanol ingestion." Eur J Clin Pharmacol, 11, p. 345-9
- Divoll M, Greenblatt DJ, Lacasse Y, Shader RI (1981) "Benzodiazepine overdosage: plasma concentrations and clinical outcome." Psychopharmacology (Berl), 73, p. 381-3
- Naylor GJ, McHarg A (1977) "Profound hypothermia on combined lithium carbonate and diazepam treatment." Br Med J, 2, p. 22
- Stovner J, Endresen R (1965) "Intravenous anaesthesia with diazepam." Acta Anaesthesiol Scand, 24, p. 223-7
- Driessen JJ, Vree TB, Booij LH, van der Pol FM, Crul JF (1984) "Effect of some benzodiazepines on peripheral neuromuscular function in the rat in-vitro hemidiaphragm preparation." J Pharm Pharmacol, 36, p. 244-7
- Feldman SA, Crawley BE (1970) "Interaction of diazepam with the muscle-relaxant drugs." Br Med J, 1, p. 336-8
- Ochs HR, Greenblatt DJ, Verburg-Ochs B (1984) "Propranolol interactions with diazepam, lorazepam and alprazolam." Clin Pharmacol Ther, 36, p. 451-5
- Desager JP, Hulhoven R, Harvengt C, Hermann P, Guillet P, Thiercelin JF (1988) "Possible interactions between zolpidem, a new sleep inducer and chlorpromazine, a phenothiazine neuroleptic." Psychopharmacology (Berl), 96, p. 63-6
- Tverskoy M, Fleyshman G, Ezry J, Bradley EL, Jr Kissin I (1989) "Midazolam-morphine sedative interaction in patients." Anesth Analg, 68, p. 282-5
- "Product Information. Iopidine (apraclonidine ophthalmic)." Alcon Laboratories Inc
- Greiff JMC, Rowbotham D (1994) "Pharmacokinetic drug interactions with gastrointestinal motility modifying agents." Clin Pharmacokinet, 27, p. 447-61
- Greb WH, Buscher G, Dierdorf HD, Koster FE, Wolf D, Mellows G (1989) "The effect of liver enzyme inhibition by cimetidine and enzyme induction by phenobarbitone on the pharmacokinetics of paroxetine." Acta Psychiatr Scand, 80 Suppl, p. 95-8
- Markowitz JS, Wells BG, Carson WH (1995) "Interactions between antipsychotic and antihypertensive drugs." Ann Pharmacother, 29, p. 603-9
- (2001) "Product Information. Ultram (tramadol)." McNeil Pharmaceutical
- (2001) "Product Information. Artane (trihexyphenidyl)." Lederle Laboratories
- (2001) "Product Information. Ultiva (remifentanil)." Mylan Institutional (formally Bioniche Pharma USA Inc)
- (2001) "Product Information. Seroquel (quetiapine)." Astra-Zeneca Pharmaceuticals
- (2001) "Product Information. Meridia (sibutramine)." Knoll Pharmaceutical Company
- (2001) "Product Information. Tasmar (tolcapone)." Valeant Pharmaceuticals
- Miller LG (1998) "Herbal medicinals: selected clinical considerations focusing on known or potential drug-herb interactions." Arch Intern Med, 158, p. 2200-11
- (2001) "Product Information. Precedex (dexmedetomidine)." Abbott Pharmaceutical
- (2001) "Product Information. Trileptal (oxcarbazepine)." Novartis Pharmaceuticals
- Ferslew KE, Hagardorn AN, McCormick WF (1990) "A fatal interaction of methocarbamol and ethanol in an accidental poisoning." J Forensic Sci, 35, p. 477-82
- Plushner SL (2000) "Valerian: valeriana officinalis." Am J Health Syst Pharm, 57, p. 328-35
- (2002) "Product Information. Xatral (alfuzosin)." Sanofi-Synthelabo Canada Inc
- (2002) "Product Information. Lexapro (escitalopram)." Forest Pharmaceuticals
- Cerner Multum, Inc. "UK Summary of Product Characteristics."
- Cerner Multum, Inc. "Australian Product Information."
- (2012) "Product Information. Fycompa (perampanel)." Eisai Inc
- (2014) "Product Information. Belsomra (suvorexant)." Merck & Co., Inc
- (2015) "Product Information. Rexulti (brexpiprazole)." Otsuka America Pharmaceutical, Inc.
Food/lifestyle interactions
Moderate food/lifestyle interactions
Moderate:
chloral hydrate Food/Lifestyle
Applies to: chloral hydrate
Generally avoid
Alcohol may potentiate some of the pharmacologic effects of CNS-active agents. Use in combination may result in additive central nervous system depression and/or impairment of judgment, thinking, and psychomotor skills.
Management
Patients receiving CNS-active agents should be warned of this interaction and advised to avoid or limit consumption of alcohol. Ambulatory patients should be counseled to avoid hazardous activities requiring complete mental alertness and motor coordination until they know how these agents affect them, and to notify their physician if they experience excessive or prolonged CNS effects that interfere with their normal activities.
References (4)
- Warrington SJ, Ankier SI, Turner P (1986) "Evaluation of possible interactions between ethanol and trazodone or amitriptyline." Neuropsychobiology, 15, p. 31-7
- Gilman AG, eds., Nies AS, Rall TW, Taylor P (1990) "Goodman and Gilman's the Pharmacological Basis of Therapeutics." New York, NY: Pergamon Press Inc.
- (2012) "Product Information. Fycompa (perampanel)." Eisai Inc
- (2015) "Product Information. Rexulti (brexpiprazole)." Otsuka America Pharmaceutical, Inc.
Moderate:
dextromethorphan Food/Lifestyle
Applies to: dextromethorphan / phenylephrine / thonzylamine
Generally avoid
Alcohol may potentiate some of the pharmacologic effects of CNS-active agents. Use in combination may result in additive central nervous system depression and/or impairment of judgment, thinking, and psychomotor skills.
Management
Patients receiving CNS-active agents should be warned of this interaction and advised to avoid or limit consumption of alcohol. Ambulatory patients should be counseled to avoid hazardous activities requiring complete mental alertness and motor coordination until they know how these agents affect them, and to notify their physician if they experience excessive or prolonged CNS effects that interfere with their normal activities.
References (4)
- Warrington SJ, Ankier SI, Turner P (1986) "Evaluation of possible interactions between ethanol and trazodone or amitriptyline." Neuropsychobiology, 15, p. 31-7
- Gilman AG, eds., Nies AS, Rall TW, Taylor P (1990) "Goodman and Gilman's the Pharmacological Basis of Therapeutics." New York, NY: Pergamon Press Inc.
- (2012) "Product Information. Fycompa (perampanel)." Eisai Inc
- (2015) "Product Information. Rexulti (brexpiprazole)." Otsuka America Pharmaceutical, Inc.
Moderate:
phenylephrine Caffeine
Applies to: dextromethorphan / phenylephrine / thonzylamine
Monitor
Coadministration of two or more sympathomimetic or noradrenergic agents may increase the risk of nervousness, irritability, tachycardia, and/or increased blood pressure. Central nervous system (CNS) stimulants, particularly amphetamines, can potentiate the adrenergic response to vasopressors and other sympathomimetic and/or noradrenergic agents, including norepinephrine transporter inhibitors. Additive increases in blood pressure and heart rate may occur due to enhanced peripheral sympathetic activity.
Management
Caution is advised if two or more sympathomimetic or noradrenergic agents are coadministered. Pulse and blood pressure should be closely monitored. Consultation with individual product labeling, as well as relevant institutional protocols, may be advisable for further guidance.
References (20)
- Rosenblatt JE, Lake CR, van Kammen DP, Ziegler MG, Bunney WE Jr (1979) "Interactions of amphetamine, pimozide, and lithium on plasma norepineophrine and dopamine-beta-hydroxylase in schizophrenic patients." Psychiatry Res, 1, p. 45-52
- Cavanaugh JH, Griffith JD, Oates JA (1970) "Effect of amphetamine on the pressor response to tyramine: formation of p-hydroxynorephedrine from amphetamine in man." Clin Pharmacol Ther, 11, p. 656
- (2001) "Product Information. Adderall (amphetamine-dextroamphetamine)." Shire Richwood Pharmaceutical Company Inc
- (2001) "Product Information. Tenuate (diethylpropion)." Aventis Pharmaceuticals
- (2001) "Product Information. Sanorex (mazindol)." Novartis Pharmaceuticals
- (2001) "Product Information. Focalin (dexmethylphenidate)." Mikart Inc
- (2024) "Product Information. Ephedrine (ephedrine)." Hameln Pharma Ltd
- (2023) "Product Information. Ephedrine Hydrochloride (ephedrine)." Wockhardt UK Ltd
- (2026) "Product Information. Strattera (atomoxetine)." Lilly, Eli and Company
- (2025) "Product Information. Atomoxetine (atomoxetine)." Zentiva Pharma UK Ltd
- (2026) "Product Information. Atomoxetine (Apo) (atomoxetine)." Arrotex Pharmaceuticals Pty Ltd
- Angita Pharma, Inc (2026) AG-ATOMOXETINE Product Monograph (Health Canada) https://pdf.hres.ca/dpd_pm/00059014.PDF
- (2026) "Product Information. Boots Decongestant (Pseudoephedrine) (pseudoephedrine)." The Boots Company Plc
- (2023) "Product Information. Sinus and Nasal Decongestant (Trust) (pseudoephedrine)." Noumed Pharmaceuticals Pty Ltd
- (2019) "Product Information. Ephedrine (ephedrine)." Pfizer Australia Pty Ltd
- (2024) "Product Information. EPHEDrine Sulfate (ePHEDrine)." Amneal Pharmaceuticals LLC
- (2024) "Product Information. Lemsip Cough Max for Mucus Cough and Cold (guaifenesin/paracetamol/phenylephrine)." Reckitt Benckiser Healthcare (UK) Ltd
- emc (2026) Product information: sudafed plus blocked nose 1mg/50mg/ml nasal spray. https://www.medicines.org.uk/emc/product/14256/smpc?utm_source=chatgpt.com
- (2023) "Product Information. EPHEDrine Sulfate (ePHEDrine)." Baxter Corporation
- Neo Health (OTC) Pty Ltd (2026) Product information: pseudoephedrine hydrochloride-paracetamol capsules. https://www.ebs.tga.gov.au/ebs/picmi/picmirepository.nsf/pdf?OpenAgent&id=CP-2024-PI-02603-1&d=20260804172310101&d=20260827172310101
Disease interactions
32 potential interactions Applies to: 26 conditions, including High Blood Pressure, Depression, Benign Prostatic Hyperplasia, Gastritis/Duodenitis, and Hyperthyroidism.
Acute Alcohol Intoxication
Major:
chloral hydrate
Chloral hydrate has a major potential interaction with Acute Alcohol Intoxication.
Anxiolytic, sedative, and hypnotic agents should generally not be given to patients with acute alcohol intoxication exhibiting depressed vital signs. The central nervous system depressant effects of these agents may be additive with those of alcohol. Severe respiratory depression and death may occur. Therapy with such agents should be administered cautiously in patients who might be prone to acute alcohol intake.
Alcoholism
Major:
chloral hydrate
Chloral hydrate has a major potential interaction with Alcoholism.
Anxiolytic, sedative, and hypnotic agents have the potential to cause dependence and abuse. Tolerance as well as physical and psychological dependence can develop, particularly after prolonged use of excessive dosages, and abrupt cessation and/or a reduction in dosage may precipitate withdrawal symptoms. In patients who have developed tolerance, overdosage can still produce respiratory depression and death. Therapy with anxiolytic, sedative, and hypnotic agents should be administered cautiously and for as brief a period as possible. Addiction-prone individuals, such as those with a history of alcohol or substance abuse, should be under careful surveillance or medical supervision when treated with these agents. In addition, it may be prudent to refrain from dispensing large quantities of medication to such patients. After prolonged use or if dependency is suspected, withdrawal of medication should be undertaken gradually using a dosage-tapering schedule.
Asphyxia
Moderate:
chloral hydrate
Chloral hydrate has a moderate potential interaction with Asphyxia.
Oral anxiolytic, sedative, and hypnotic agents may cause respiratory depression and apnea when given in high dosages or following acute overdose. However, some patients may be susceptible at commonly used dosages, including the elderly, debilitated or severely ill patients, those receiving other CNS depressants, and those with limited ventilatory reserve, chronic pulmonary insufficiency or other respiratory disorders. Therapy with anxiolytic, sedative, and hypnotic agents should be administered cautiously in these patients. Appropriate monitoring and individualization of dosage are recommended.
Benign Prostatic Hyperplasia
Moderate:
dextromethorphan / phenylephrine / thonzylamine
The phenylephrine in dextromethorphan / phenylephrine / thonzylamine has a moderate potential interaction with Benign Prostatic Hyperplasia.
Sympathomimetic agents may cause or worsen urinary difficulty in patients with prostate enlargement due to smooth muscle contraction in the bladder neck via stimulation of alpha-1 adrenergic receptors. Therapy with sympathomimetic agents should be administered cautiously in patients with hypertrophy or neoplasm of the prostate.
Cardiovascular Conditions and Disorders
Major:
dextromethorphan / phenylephrine / thonzylamine
The phenylephrine in dextromethorphan / phenylephrine / thonzylamine has a major potential interaction with Cardiovascular Conditions and Disorders.
Sympathomimetic agents may cause adverse cardiovascular effects, particularly when used in high dosages and/or in susceptible patients. In cardiac tissues, these agents may produce positive chronotropic and inotropic effects via stimulation of beta- 1 adrenergic receptors. Cardiac output, oxygen consumption, and the work of the heart may be increased. In the peripheral vasculature, vasoconstriction may occur via stimulation of alpha-1 adrenergic receptors. Palpitations, tachycardia, arrhythmia, hypertension, reflex bradycardia, coronary occlusion, cerebral vasculitis, myocardial infarction, cardiac arrest, and death have been reported. Some of these agents, particularly ephedra alkaloids (ephedrine, ma huang, phenylpropanolamine), may also predispose patients to hemorrhagic and ischemic stroke. Therapy with sympathomimetic agents should generally be avoided or administered cautiously in patients with sensitivity to sympathomimetic amines, hyperthyroidism, or underlying cardiovascular or cerebrovascular disorders. These agents should not be used in patients with severe coronary artery disease or severe/uncontrolled hypertension.
Cerebrovascular Insufficiency
Major:
dextromethorphan / phenylephrine / thonzylamine
The phenylephrine in dextromethorphan / phenylephrine / thonzylamine has a major potential interaction with Cerebrovascular Insufficiency.
Sympathomimetic agents may cause adverse cardiovascular effects, particularly when used in high dosages and/or in susceptible patients. In cardiac tissues, these agents may produce positive chronotropic and inotropic effects via stimulation of beta- 1 adrenergic receptors. Cardiac output, oxygen consumption, and the work of the heart may be increased. In the peripheral vasculature, vasoconstriction may occur via stimulation of alpha-1 adrenergic receptors. Palpitations, tachycardia, arrhythmia, hypertension, reflex bradycardia, coronary occlusion, cerebral vasculitis, myocardial infarction, cardiac arrest, and death have been reported. Some of these agents, particularly ephedra alkaloids (ephedrine, ma huang, phenylpropanolamine), may also predispose patients to hemorrhagic and ischemic stroke. Therapy with sympathomimetic agents should generally be avoided or administered cautiously in patients with sensitivity to sympathomimetic amines, hyperthyroidism, or underlying cardiovascular or cerebrovascular disorders. These agents should not be used in patients with severe coronary artery disease or severe/uncontrolled hypertension.
Depression
Major:
chloral hydrate
Chloral hydrate has a major potential interaction with Depression.
A variety of abnormal thinking and behavior changes have been reported to occur in association with the use of most anxiolytics, sedatives and hypnotics. Some of these changes include decreased inhibition, aggressiveness, agitation, and hallucinations. These drugs can cause or exacerbate mental depression and cause suicidal behavior and ideation. Therapy with these drugs should be administered cautiously in patients with a history of depression or other psychiatric disorders. Patients should be monitored for any changes in mood or behavior. It may be prudent to refrain from dispensing large quantities of medication to these patients.
Diabetes Mellitus
Moderate:
dextromethorphan / phenylephrine / thonzylamine
The thonzylamine in dextromethorphan / phenylephrine / thonzylamine has a moderate potential interaction with Diabetes Mellitus.
Nasal decongestants that have thonzylamine should be used under physician supervision in patients with conditions such as high blood pressure, heart disease, diabetes, glaucoma, thyroid disease, and respiratory problems as emphysema or chronic bronchitis. Health care providers should outweighing the risks and the benefits of treatment in patients with these conditions.
Moderate:
dextromethorphan / phenylephrine / thonzylamine
The phenylephrine in dextromethorphan / phenylephrine / thonzylamine has a moderate potential interaction with Diabetes Mellitus.
Sympathomimetic agents may cause increases in blood glucose concentrations. These effects are usually transient and slight but may be significant with dosages higher than those normally recommended. Therapy with sympathomimetic agents should be administered cautiously in patients with diabetes mellitus. Closer monitoring of blood glucose concentrations may be appropriate.
Drug Dependence
Major:
chloral hydrate
Chloral hydrate has a major potential interaction with Drug Dependence.
Anxiolytic, sedative, and hypnotic agents have the potential to cause dependence and abuse. Tolerance as well as physical and psychological dependence can develop, particularly after prolonged use of excessive dosages, and abrupt cessation and/or a reduction in dosage may precipitate withdrawal symptoms. In patients who have developed tolerance, overdosage can still produce respiratory depression and death. Therapy with anxiolytic, sedative, and hypnotic agents should be administered cautiously and for as brief a period as possible. Addiction-prone individuals, such as those with a history of alcohol or substance abuse, should be under careful surveillance or medical supervision when treated with these agents. In addition, it may be prudent to refrain from dispensing large quantities of medication to such patients. After prolonged use or if dependency is suspected, withdrawal of medication should be undertaken gradually using a dosage-tapering schedule.
Esophageal Ulceration
Moderate:
chloral hydrate
Chloral hydrate has a moderate potential interaction with Esophageal Ulceration.
Chloral hydrate may cause esophageal and gastric irritation. Oral use of chloral hydrate should be avoided in patients with esophagitis, gastritis, duodenitis, or peptic ulcer disease.
Esophagitis
Moderate:
chloral hydrate
Chloral hydrate has a moderate potential interaction with Esophagitis.
Chloral hydrate may cause esophageal and gastric irritation. Oral use of chloral hydrate should be avoided in patients with esophagitis, gastritis, duodenitis, or peptic ulcer disease.
Gastritis/Duodenitis
Moderate:
chloral hydrate
Chloral hydrate has a moderate potential interaction with Gastritis/Duodenitis.
Chloral hydrate may cause esophageal and gastric irritation. Oral use of chloral hydrate should be avoided in patients with esophagitis, gastritis, duodenitis, or peptic ulcer disease.
Glaucoma/Intraocular Hypertension
Moderate:
chloral hydrate
Chloral hydrate has a moderate potential interaction with Glaucoma/Intraocular Hypertension.
Some hypnotic drugs can have an anticholinergic effect and should be used with caution in patients with glaucoma, and trouble urinating due to retention or enlarged prostate.
Moderate:
dextromethorphan / phenylephrine / thonzylamine
The thonzylamine in dextromethorphan / phenylephrine / thonzylamine has a moderate potential interaction with Glaucoma/Intraocular Hypertension.
Nasal decongestants that have thonzylamine should be used under physician supervision in patients with conditions such as high blood pressure, heart disease, diabetes, glaucoma, thyroid disease, and respiratory problems as emphysema or chronic bronchitis. Health care providers should outweighing the risks and the benefits of treatment in patients with these conditions.
Moderate:
dextromethorphan / phenylephrine / thonzylamine
The phenylephrine in dextromethorphan / phenylephrine / thonzylamine has a moderate potential interaction with Glaucoma/Intraocular Hypertension.
Sympathomimetic agents can induce transient mydriasis via stimulation of alpha-1 adrenergic receptors. In patients with anatomically narrow angles or narrow-angle glaucoma, pupillary dilation can provoke an acute attack. In patients with other forms of glaucoma, mydriasis may occasionally increase intraocular pressure. Therapy with sympathomimetic agents should be administered cautiously in patients with or predisposed to glaucoma, particularly narrow-angle glaucoma.
Heart Disease
Moderate:
chloral hydrate
Chloral hydrate has a moderate potential interaction with Heart Disease.
Although continued use of chloral hydrate at therapeutic dosages has not been associated with deleterious effects on the heart, large doses may produce peripheral vasodilation, hypotension, arrhythmias, and myocardial depression. High dosages of chloral hydrate should be avoided in patients with severe cardiac disease.
Moderate:
dextromethorphan / phenylephrine / thonzylamine
The thonzylamine in dextromethorphan / phenylephrine / thonzylamine has a moderate potential interaction with Heart Disease.
Nasal decongestants that have thonzylamine should be used under physician supervision in patients with conditions such as high blood pressure, heart disease, diabetes, glaucoma, thyroid disease, and respiratory problems as emphysema or chronic bronchitis. Health care providers should outweighing the risks and the benefits of treatment in patients with these conditions.
High Blood Pressure
Moderate:
dextromethorphan / phenylephrine / thonzylamine
The thonzylamine in dextromethorphan / phenylephrine / thonzylamine has a moderate potential interaction with High Blood Pressure.
Nasal decongestants that have thonzylamine should be used under physician supervision in patients with conditions such as high blood pressure, heart disease, diabetes, glaucoma, thyroid disease, and respiratory problems as emphysema or chronic bronchitis. Health care providers should outweighing the risks and the benefits of treatment in patients with these conditions.
Hyperthyroidism
Major:
dextromethorphan / phenylephrine / thonzylamine
The phenylephrine in dextromethorphan / phenylephrine / thonzylamine has a major potential interaction with Hyperthyroidism.
Sympathomimetic agents may cause adverse cardiovascular effects, particularly when used in high dosages and/or in susceptible patients. In cardiac tissues, these agents may produce positive chronotropic and inotropic effects via stimulation of beta- 1 adrenergic receptors. Cardiac output, oxygen consumption, and the work of the heart may be increased. In the peripheral vasculature, vasoconstriction may occur via stimulation of alpha-1 adrenergic receptors. Palpitations, tachycardia, arrhythmia, hypertension, reflex bradycardia, coronary occlusion, cerebral vasculitis, myocardial infarction, cardiac arrest, and death have been reported. Some of these agents, particularly ephedra alkaloids (ephedrine, ma huang, phenylpropanolamine), may also predispose patients to hemorrhagic and ischemic stroke. Therapy with sympathomimetic agents should generally be avoided or administered cautiously in patients with sensitivity to sympathomimetic amines, hyperthyroidism, or underlying cardiovascular or cerebrovascular disorders. These agents should not be used in patients with severe coronary artery disease or severe/uncontrolled hypertension.
Liver Disease
Major:
chloral hydrate
Chloral hydrate has a major potential interaction with Liver Disease.
The use of chloral hydrate is contraindicated in patients with marked renal and/or hepatic impairment due to the potential for significant drug and metabolite accumulation. Chloral hydrate is metabolized by the liver and erythrocytes to the pharmacologically active compound, trichloroethanol (TCE), which has a plasma half-life of 8 to 12 hours. TCE is then metabolized further by both the liver and kidney to inactive substances that are slowly excreted in the urine. High plasma levels of chloral hydrate and TCE may produce respiratory depression and adverse cardiovascular effects such as peripheral vasodilation, hypotension, arrhythmias, and myocardial depression.
Moderate:
chloral hydrate
Chloral hydrate has a moderate potential interaction with Liver Disease.
In general, anxiolytics, sedatives and hypnotics are extensively metabolized by the liver. Their plasma clearance may be decreased and their half-life prolonged in patients with impaired hepatic function. Therapy with these drugs should be administered cautiously in patients with liver disease (some are not recommended in severe liver impairment), and the dosage should be adjusted accordingly. Laboratory testing is recommended prior and during treatment.
Peptic Ulcer
Moderate:
chloral hydrate
Chloral hydrate has a moderate potential interaction with Peptic Ulcer.
Chloral hydrate may cause esophageal and gastric irritation. Oral use of chloral hydrate should be avoided in patients with esophagitis, gastritis, duodenitis, or peptic ulcer disease.
Pheochromocytoma
Major:
dextromethorphan / phenylephrine / thonzylamine
The phenylephrine in dextromethorphan / phenylephrine / thonzylamine has a major potential interaction with Pheochromocytoma.
Sympathomimetic agents may cause adverse cardiovascular effects, particularly when used in high dosages and/or in susceptible patients. In cardiac tissues, these agents may produce positive chronotropic and inotropic effects via stimulation of beta- 1 adrenergic receptors. Cardiac output, oxygen consumption, and the work of the heart may be increased. In the peripheral vasculature, vasoconstriction may occur via stimulation of alpha-1 adrenergic receptors. Palpitations, tachycardia, arrhythmia, hypertension, reflex bradycardia, coronary occlusion, cerebral vasculitis, myocardial infarction, cardiac arrest, and death have been reported. Some of these agents, particularly ephedra alkaloids (ephedrine, ma huang, phenylpropanolamine), may also predispose patients to hemorrhagic and ischemic stroke. Therapy with sympathomimetic agents should generally be avoided or administered cautiously in patients with sensitivity to sympathomimetic amines, hyperthyroidism, or underlying cardiovascular or cerebrovascular disorders. These agents should not be used in patients with severe coronary artery disease or severe/uncontrolled hypertension.
Prostate Tumor, Benign
Moderate:
dextromethorphan / phenylephrine / thonzylamine
The phenylephrine in dextromethorphan / phenylephrine / thonzylamine has a moderate potential interaction with Prostate Tumor, Benign.
Sympathomimetic agents may cause or worsen urinary difficulty in patients with prostate enlargement due to smooth muscle contraction in the bladder neck via stimulation of alpha-1 adrenergic receptors. Therapy with sympathomimetic agents should be administered cautiously in patients with hypertrophy or neoplasm of the prostate.
Pulmonary Impairment
Moderate:
chloral hydrate
Chloral hydrate has a moderate potential interaction with Pulmonary Impairment.
Oral anxiolytic, sedative, and hypnotic agents may cause respiratory depression and apnea when given in high dosages or following acute overdose. However, some patients may be susceptible at commonly used dosages, including the elderly, debilitated or severely ill patients, those receiving other CNS depressants, and those with limited ventilatory reserve, chronic pulmonary insufficiency or other respiratory disorders. Therapy with anxiolytic, sedative, and hypnotic agents should be administered cautiously in these patients. Appropriate monitoring and individualization of dosage are recommended.
Moderate:
dextromethorphan / phenylephrine / thonzylamine
The thonzylamine in dextromethorphan / phenylephrine / thonzylamine has a moderate potential interaction with Pulmonary Impairment.
Nasal decongestants that have thonzylamine should be used under physician supervision in patients with conditions such as high blood pressure, heart disease, diabetes, glaucoma, thyroid disease, and respiratory problems as emphysema or chronic bronchitis. Health care providers should outweighing the risks and the benefits of treatment in patients with these conditions.
Renal Dysfunction
Major:
chloral hydrate
Chloral hydrate has a major potential interaction with Renal Dysfunction.
The use of chloral hydrate is contraindicated in patients with marked renal and/or hepatic impairment due to the potential for significant drug and metabolite accumulation. Chloral hydrate is metabolized by the liver and erythrocytes to the pharmacologically active compound, trichloroethanol (TCE), which has a plasma half-life of 8 to 12 hours. TCE is then metabolized further by both the liver and kidney to inactive substances that are slowly excreted in the urine. High plasma levels of chloral hydrate and TCE may produce respiratory depression and adverse cardiovascular effects such as peripheral vasodilation, hypotension, arrhythmias, and myocardial depression.
Respiratory Arrest
Moderate:
chloral hydrate
Chloral hydrate has a moderate potential interaction with Respiratory Arrest.
Oral anxiolytic, sedative, and hypnotic agents may cause respiratory depression and apnea when given in high dosages or following acute overdose. However, some patients may be susceptible at commonly used dosages, including the elderly, debilitated or severely ill patients, those receiving other CNS depressants, and those with limited ventilatory reserve, chronic pulmonary insufficiency or other respiratory disorders. Therapy with anxiolytic, sedative, and hypnotic agents should be administered cautiously in these patients. Appropriate monitoring and individualization of dosage are recommended.
Thyroid Disease
Moderate:
dextromethorphan / phenylephrine / thonzylamine
The thonzylamine in dextromethorphan / phenylephrine / thonzylamine has a moderate potential interaction with Thyroid Disease.
Nasal decongestants that have thonzylamine should be used under physician supervision in patients with conditions such as high blood pressure, heart disease, diabetes, glaucoma, thyroid disease, and respiratory problems as emphysema or chronic bronchitis. Health care providers should outweighing the risks and the benefits of treatment in patients with these conditions.
Urinary Retention
Moderate:
chloral hydrate
Chloral hydrate has a moderate potential interaction with Urinary Retention.
Some hypnotic drugs can have an anticholinergic effect and should be used with caution in patients with glaucoma, and trouble urinating due to retention or enlarged prostate.
Urinary Tract Obstruction
Moderate:
dextromethorphan / phenylephrine / thonzylamine
The thonzylamine in dextromethorphan / phenylephrine / thonzylamine has a moderate potential interaction with Urinary Tract Obstruction.
Nasal decongestants that have thonzylamine should be used under physician supervision in patients with conditions such as high blood pressure, heart disease, diabetes, glaucoma, thyroid disease, and respiratory problems as emphysema or chronic bronchitis. Health care providers should outweighing the risks and the benefits of treatment in patients with these conditions.
More resources
chloral hydrate
A total of 367 drugs are known to interact with chloral hydrate.
- Chloral hydrate is in the drug class miscellaneous anxiolytics, sedatives and hypnotics.
- Chloral hydrate is used to treat the following conditions:
dextromethorphan / phenylephrine / thonzylamine
A total of 563 drugs are known to interact with dextromethorphan / phenylephrine / thonzylamine.
- Dextromethorphan / phenylephrine / thonzylamine is in the drug class upper respiratory combinations.
Drug Interaction Classification
| Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit. | |
| Moderately clinically significant. Usually avoid combinations; use it only under special circumstances. | |
| Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan. | |
| No interaction information available. |
Further information
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.