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Interactions between Abemaciclib and Acetaminophen / brompheniramine

1 drug interaction and 27 additional warnings found for the following 2 drugs:

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Drug interactions

Moderate drug interactions

Moderate:

acetaminophen abemaciclib

Applies to: acetaminophen / brompheniramine and abemaciclib
Monitor

Coadministration of acetaminophen with other potentially hepatotoxic agents may increase the risk of liver injury. The mechanism may involve additive hepatotoxic effects and, for some medicines, increased formation of hepatotoxic acetaminophen metabolites due to induction of hepatic enzymes. Therapeutic-dose acetaminophen-induced hepatotoxicity, including fatal cases, has been reported in patients with factors associated with increased hepatotoxicity risk, including concomitant use of hepatotoxic drugs, low body weight, renal or hepatic impairment, chronic alcoholism, and malnutrition or other conditions associated with glutathione depletion.

Management

Caution is advised when acetaminophen is used with other potentially hepatotoxic agents, particularly in patients with additional risk factors for hepatotoxicity. Alternative therapy may be considered when appropriate. Patients should not exceed the recommended acetaminophen dosage or use multiple acetaminophen-containing products concurrently. Patients should be monitored for clinical signs and symptoms of liver injury, and liver function monitoring may be appropriate in patients receiving prolonged or high-dose therapy or those at increased risk of hepatotoxicity. If liver injury is suspected, paracetamol should be discontinued and the patient evaluated promptly.

References (5)
  1. (2025) "Product Information. Anadin Paracetamol (paracetamol)." Haleon UK Trading Ltd
  2. (2025) "Product Information. Mersynonight (diphenhydramine-paracetamol)." Sanofi-Aventis Healthcare Pty Ltd T/A Sanofi Consumer Healthcare
  3. (2023) "Product Information. Acetaminophen (acetaminophen)." B. Braun of Canada Ltd
  4. (2026) "Product Information. Acetaminophen (acetaminophen)." Marlex Pharmaceuticals
  5. (2025) "Product Information. ANTIDOL INFANTIL (paracetamol)." LABORATORIOS CINFA, S.A.

Food/lifestyle interactions

Major food/lifestyle interactions

Major:

acetaminophen Food/Lifestyle

Applies to: acetaminophen / brompheniramine
Generally avoid

Chronic, excessive consumption of alcohol may increase the risk of acetaminophen-induced hepatotoxicity, which has included rare cases of fatal hepatitis and frank hepatic failure requiring liver transplantation. The proposed mechanism is induction of hepatic microsomal enzymes during chronic alcohol use, which may result in accelerated metabolism of acetaminophen and increased production of potentially hepatotoxic metabolites.

Management

In general, chronic alcoholics should avoid regular or excessive use of acetaminophen. Alternative analgesic/antipyretic therapy may be appropriate in patients who consume three or more alcoholic drinks per day.

References (1)
  1. (2022) "Product Information. Acetaminophen (acetaminophen)." Camber Pharmaceuticals, Inc

Moderate food/lifestyle interactions

Moderate:

brompheniramine Food/Lifestyle

Applies to: acetaminophen / brompheniramine
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)
  1. Warrington SJ, Ankier SI, Turner P (1986) "Evaluation of possible interactions between ethanol and trazodone or amitriptyline." Neuropsychobiology, 15, p. 31-7
  2. 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.
  3. (2012) "Product Information. Fycompa (perampanel)." Eisai Inc
  4. (2015) "Product Information. Rexulti (brexpiprazole)." Otsuka America Pharmaceutical, Inc.
Moderate:

abemaciclib Food/Lifestyle

Applies to: abemaciclib
Generally avoid

Grapefruit juice may increase the plasma concentrations of abemaciclib. The proposed mechanism is inhibition of CYP450 3A4-mediated first-pass metabolism in the gut wall by certain compounds present in grapefruit. Inhibition of hepatic CYP450 3A4 may also contribute. The interaction has not been studied with grapefruit juice, but has been reported for other CYP450 3A4 inhibitors. According to the product labeling, abemaciclib systemic exposure (AUC) is predicted to increase by up to 16-fold when administered with the potent CYP450 3A4 inhibitor ketoconazole. Itraconazole, another potent inhibitor, is predicted to increase the relative potency-adjusted unbound AUC of abemaciclib plus its active metabolites by 2.2-fold. In cancer patients, administration of a single 50 mg dose of abemaciclib (one-third the approved recommended dose of 150 mg) with clarithromycin 500 mg twice daily increased the relative potency-adjusted unbound AUC of abemaciclib plus its active metabolites by 2.5-fold relative to abemaciclib administered alone. The moderate CYP450 3A4 inhibitors, diltiazem and verapamil, are predicted to increase the relative potency-adjusted unbound AUC of abemaciclib plus its active metabolites by 2.4-fold and 1.6-fold, respectively. In general, the effect of grapefruit juice is concentration-, dose- and preparation-dependent, and can vary widely among brands. Certain preparations of grapefruit juice (e.g., high dose, double strength) have sometimes demonstrated potent inhibition of CYP450 3A4, while other preparations (e.g., low dose, single strength) have typically demonstrated moderate inhibition. Increased exposure to abemaciclib may increase adverse effects such as nausea, vomiting, diarrhea, stomatitis, venous thromboembolism, hepatotoxicity, anemia, neutropenia, and thrombocytopenia. Food has modest effects on the pharmacokinetics of abemaciclib. A high-fat, high-calorie meal (800 to 1000 calories; 150 calories from protein, 250 calories from carbohydrate, and 500 to 600 calories from fat) administered to healthy subjects increased the Cmax and AUC of abemaciclib plus its active metabolites by 26% and 9%, respectively.

Management

Abemaciclib may be administered with or without food. Patients should avoid consumption of grapefruit and grapefruit juice during treatment with abemaciclib.

References (1)
  1. (2017) "Product Information. Verzenio (abemaciclib)." Lilly, Eli and Company

Disease interactions

24 potential interactions Applies to: 21 conditions, including Asthma, COPD, Diarrhea, Hypotension, and Hyperthyroidism.

Alcoholism

Major:

acetaminophen / brompheniramine

The acetaminophen in acetaminophen / brompheniramine has a major potential interaction with Alcoholism.

Chronic alcohol abusers may be at increased risk of hepatotoxicity during treatment with acetaminophen (APAP). Severe liver injury, including cases of acute liver failure resulting in liver transplant and death, has been reported in patients using acetaminophen. Therapy with acetaminophen should be administered cautiously, if at all, in patients who consume three or more alcoholic drinks a day. In general, patients should avoid drinking alcohol while taking acetaminophen-containing medications. Patients should be warned not to exceed the maximum recommended total daily dosage of acetaminophen (4 g/day in adults and children 12 years of age or older), and to read all prescription and over-the-counter medication labels to ensure they are not taking multiple acetaminophen-containing products, or check with a healthcare professional if they are unsure. They should also be advised to seek medical attention if they experience signs and symptoms of liver injury such as fever, rash, anorexia, nausea, vomiting, fatigue, right upper quadrant pain, dark urine, and jaundice.

Asthma

Moderate:

acetaminophen / brompheniramine

The brompheniramine in acetaminophen / brompheniramine has a moderate potential interaction with Asthma.

It has been suggested that the anticholinergic effect of antihistamines may reduce the volume and cause thickening of bronchial secretions, resulting in obstruction of respiratory tract. Some manufacturers and clinicians recommend that therapy with antihistamines be administered cautiously in patients with asthma or chronic obstructive pulmonary disease.

Cardiovascular Conditions and Disorders

Moderate:

acetaminophen / brompheniramine

The brompheniramine in acetaminophen / brompheniramine has a moderate potential interaction with Cardiovascular Conditions and Disorders.

Antihistamines may infrequently cause cardiovascular adverse effects related to their anticholinergic and local anesthetic (quinidine-like) activities. Tachycardia, palpitation, ECG changes, arrhythmias, hypotension, and hypertension have been reported. Although these effects are uncommon and usually limited to overdosage situations, the manufacturers and some clinicians recommend that therapy with antihistamines be administered cautiously in patients with cardiovascular disease, hypertension, and/or hyperthyroidism.

COPD

Moderate:

acetaminophen / brompheniramine

The brompheniramine in acetaminophen / brompheniramine has a moderate potential interaction with COPD.

It has been suggested that the anticholinergic effect of antihistamines may reduce the volume and cause thickening of bronchial secretions, resulting in obstruction of respiratory tract. Some manufacturers and clinicians recommend that therapy with antihistamines be administered cautiously in patients with asthma or chronic obstructive pulmonary disease.

Dehydration

Major:

acetaminophen / brompheniramine

The acetaminophen in acetaminophen / brompheniramine has a major potential interaction with Dehydration.

Acetaminophen is contraindicated in patients with severe hepatic impairment or severe active liver disease. Patients with hepatic impairment may be at increased risk of toxicity. Severe liver injury, including cases of acute liver failure and death, have been reported in patients using this drug. Clinical monitoring of hepatic function is recommended. Caution is advised if using acetaminophen in patients with chronic malnutrition or severe hypovolemia. Instruct patients to avoid drinking alcohol while taking acetaminophen-containing medications. Patients should be warned not to exceed the maximum recommended total daily dosage of acetaminophen (4 g/day in adults and children 12 years of age or older), and to read all prescription and over-the-counter medication labels to ensure they are not taking multiple acetaminophen-containing products, or check with a healthcare professional if they are unsure.

Moderate:

abemaciclib

Abemaciclib has a moderate potential interaction with Dehydration.

Diarrhea, sometimes associated with dehydration and infection, has occurred in patients receiving abemaciclib. Diarrhea incidence was greatest during the first month of abemaciclib dosing. Care should be exercised when treating patients with symptoms of diarrhea. Treatment discontinuation may be required for Grade 3 or 4 diarrhea, or diarrhea that requires hospitalization. Resume treatment at the next lower dose once toxicity resolves to <= Grade 1 diarrhea.

Diarrhea

Moderate:

abemaciclib

Abemaciclib has a moderate potential interaction with Diarrhea.

Diarrhea, sometimes associated with dehydration and infection, has occurred in patients receiving abemaciclib. Diarrhea incidence was greatest during the first month of abemaciclib dosing. Care should be exercised when treating patients with symptoms of diarrhea. Treatment discontinuation may be required for Grade 3 or 4 diarrhea, or diarrhea that requires hospitalization. Resume treatment at the next lower dose once toxicity resolves to <= Grade 1 diarrhea.

Fever

Moderate:

abemaciclib

Abemaciclib has a moderate potential interaction with Fever.

Neutropenia, including febrile neutropenia has occurred in patients receiving abemaciclib. Care should be exercised when prescribing this agent to patients with preexisting neutropenia. It is recommended to monitor complete blood counts prior to the start of therapy, every 2 weeks for the first 2 months, monthly for the next 2 months, and as clinically indicated. Dose interruption, dose reduction, or delay in starting treatment cycles is recommended for patients who develop Grade 3 or 4 neutropenia.

Gastrointestinal Obstruction

Moderate:

acetaminophen / brompheniramine

The brompheniramine in acetaminophen / brompheniramine has a moderate potential interaction with Gastrointestinal Obstruction.

Antihistamines often have anticholinergic activity, to which elderly patients are particularly sensitive. Therapy with antihistamines should be administered cautiously, if at all, in patients with preexisting conditions that are likely to be exacerbated by anticholinergic activity, such as urinary retention or obstruction; angle-closure glaucoma, untreated intraocular hypertension, or uncontrolled primary open-angle glaucoma; and gastrointestinal obstructive disorders. Conventional, first-generation antihistamines such as the ethanolamines (bromodiphenhydramine, carbinoxamine, clemastine, dimenhydrinate, diphenhydramine, doxylamine, phenyltoloxamine) tend to exhibit substantial anticholinergic effects. In contrast, the newer, relatively nonsedating antihistamines (e.g., cetirizine, fexofenadine, loratadine) reportedly have low to minimal anticholinergic activity at normally recommended dosages and may be appropriate alternatives.

Glaucoma/Intraocular Hypertension

Moderate:

acetaminophen / brompheniramine

The brompheniramine in acetaminophen / brompheniramine has a moderate potential interaction with Glaucoma/Intraocular Hypertension.

Antihistamines often have anticholinergic activity, to which elderly patients are particularly sensitive. Therapy with antihistamines should be administered cautiously, if at all, in patients with preexisting conditions that are likely to be exacerbated by anticholinergic activity, such as urinary retention or obstruction; angle-closure glaucoma, untreated intraocular hypertension, or uncontrolled primary open-angle glaucoma; and gastrointestinal obstructive disorders. Conventional, first-generation antihistamines such as the ethanolamines (bromodiphenhydramine, carbinoxamine, clemastine, dimenhydrinate, diphenhydramine, doxylamine, phenyltoloxamine) tend to exhibit substantial anticholinergic effects. In contrast, the newer, relatively nonsedating antihistamines (e.g., cetirizine, fexofenadine, loratadine) reportedly have low to minimal anticholinergic activity at normally recommended dosages and may be appropriate alternatives.

Hyperthyroidism

Moderate:

acetaminophen / brompheniramine

The brompheniramine in acetaminophen / brompheniramine has a moderate potential interaction with Hyperthyroidism.

Antihistamines may infrequently cause cardiovascular adverse effects related to their anticholinergic and local anesthetic (quinidine-like) activities. Tachycardia, palpitation, ECG changes, arrhythmias, hypotension, and hypertension have been reported. Although these effects are uncommon and usually limited to overdosage situations, the manufacturers and some clinicians recommend that therapy with antihistamines be administered cautiously in patients with cardiovascular disease, hypertension, and/or hyperthyroidism.

Hypotension

Moderate:

acetaminophen / brompheniramine

The brompheniramine in acetaminophen / brompheniramine has a moderate potential interaction with Hypotension.

Antihistamines may infrequently cause cardiovascular adverse effects related to their anticholinergic and local anesthetic (quinidine-like) activities. Tachycardia, palpitation, ECG changes, arrhythmias, hypotension, and hypertension have been reported. Although these effects are uncommon and usually limited to overdosage situations, the manufacturers and some clinicians recommend that therapy with antihistamines be administered cautiously in patients with cardiovascular disease, hypertension, and/or hyperthyroidism.

Infectious Gastroenteritis

Moderate:

abemaciclib

Abemaciclib has a moderate potential interaction with Infectious Gastroenteritis.

Diarrhea, sometimes associated with dehydration and infection, has occurred in patients receiving abemaciclib. Diarrhea incidence was greatest during the first month of abemaciclib dosing. Care should be exercised when treating patients with symptoms of diarrhea. Treatment discontinuation may be required for Grade 3 or 4 diarrhea, or diarrhea that requires hospitalization. Resume treatment at the next lower dose once toxicity resolves to <= Grade 1 diarrhea.

Interstitial Lung Disease

Moderate:

abemaciclib

Abemaciclib has a moderate potential interaction with Interstitial Lung Disease.

Patients treated with abemaciclib have reported severe, life-threatening, or fatal interstitial lung disease (ILD) and/or pneumonitis. It is recommended to monitor patients for pulmonary symptoms indicative of ILD/pneumonitis such as, hypoxia, cough, dyspnea, or interstitial infiltrates on radiologic exams. Dose interruption or dose reduction is recommended for patients who develop persistent or recurrent Grade 2 ILD/pneumonitis. Permanently discontinue therapy in all patients with Grade 3 or 4 ILD or pneumonitis.

Liver Disease

Major:

abemaciclib

Abemaciclib has a major potential interaction with Liver Disease.

The dosing frequency of abemaciclib should be reduced to once daily when it is administered to patients with severe hepatic impairment (Child-Pugh C). No dosage adjustments are necessary for patients with mild or moderate hepatic impairment (Child-Pugh A or B). Hepatotoxicity has been reported with the use of abemaciclib. It is recommended to monitor liver function tests prior to the start of therapy, every 2 weeks for the first 2 months, monthly for the next 2 months, and as clinically indicated. Dose interruption, dose reduction, dose discontinuation, or delay in starting treatment cycles is recommended for patients who develop persistent or recurrent Grade 2, or Grade 3 or 4, hepatic transaminase elevation.

Major:

acetaminophen / brompheniramine

The acetaminophen in acetaminophen / brompheniramine has a major potential interaction with Liver Disease.

Acetaminophen is contraindicated in patients with severe hepatic impairment or severe active liver disease. Patients with hepatic impairment may be at increased risk of toxicity. Severe liver injury, including cases of acute liver failure and death, have been reported in patients using this drug. Clinical monitoring of hepatic function is recommended. Caution is advised if using acetaminophen in patients with chronic malnutrition or severe hypovolemia. Instruct patients to avoid drinking alcohol while taking acetaminophen-containing medications. Patients should be warned not to exceed the maximum recommended total daily dosage of acetaminophen (4 g/day in adults and children 12 years of age or older), and to read all prescription and over-the-counter medication labels to ensure they are not taking multiple acetaminophen-containing products, or check with a healthcare professional if they are unsure.

Moderate:

acetaminophen / brompheniramine

The brompheniramine in acetaminophen / brompheniramine has a moderate potential interaction with Liver Disease.

Limited pharmacokinetic data are available for the older, first-generation antihistamines. Many appear to be primarily metabolized by the liver, and both parent drugs and metabolites are excreted in the urine. Patients with renal and/or liver disease may be at greater risk for adverse effects from antihistamines due to drug and metabolite accumulation. Therapy with antihistamines should be administered cautiously in such patients. Lower initial dosages may be appropriate.

Malnourishment

Major:

acetaminophen / brompheniramine

The acetaminophen in acetaminophen / brompheniramine has a major potential interaction with Malnourishment.

Acetaminophen is contraindicated in patients with severe hepatic impairment or severe active liver disease. Patients with hepatic impairment may be at increased risk of toxicity. Severe liver injury, including cases of acute liver failure and death, have been reported in patients using this drug. Clinical monitoring of hepatic function is recommended. Caution is advised if using acetaminophen in patients with chronic malnutrition or severe hypovolemia. Instruct patients to avoid drinking alcohol while taking acetaminophen-containing medications. Patients should be warned not to exceed the maximum recommended total daily dosage of acetaminophen (4 g/day in adults and children 12 years of age or older), and to read all prescription and over-the-counter medication labels to ensure they are not taking multiple acetaminophen-containing products, or check with a healthcare professional if they are unsure.

Neutropenia

Moderate:

abemaciclib

Abemaciclib has a moderate potential interaction with Neutropenia.

Neutropenia, including febrile neutropenia has occurred in patients receiving abemaciclib. Care should be exercised when prescribing this agent to patients with preexisting neutropenia. It is recommended to monitor complete blood counts prior to the start of therapy, every 2 weeks for the first 2 months, monthly for the next 2 months, and as clinically indicated. Dose interruption, dose reduction, or delay in starting treatment cycles is recommended for patients who develop Grade 3 or 4 neutropenia.

Phenylketonuria

Moderate:

acetaminophen / brompheniramine

The acetaminophen in acetaminophen / brompheniramine has a moderate potential interaction with Phenylketonuria.

Several oral acetaminophen and acetaminophen-combination products, particularly flavored chewable tablets, contain the artificial sweetener, aspartame (NutraSweet). Aspartame is converted to phenylalanine in the gastrointestinal tract following ingestion. Chewable and effervescent formulations of acetaminophen products may also contain phenylalanine. The aspartame/phenylalanine content should be considered when these products are used in patients who must restrict their intake of phenylalanine (i.e. phenylketonurics).

Pulmonary Impairment

Moderate:

abemaciclib

Abemaciclib has a moderate potential interaction with Pulmonary Impairment.

The use of certain multikinase inhibitors has been associated with pulmonary toxicity. Serious cases of interstitial lung disease (ILD), including fatal cases and interstitial pneumonitis or pulmonary fibrosis have been reported. Caution is recommended when using these agents in patients with a history of interstitial pneumonitis or pulmonary fibrosis or those patients presenting with acute onset of new or progressive unexplained pulmonary symptoms such as dyspnea, cough, and fever pending diagnostic evaluation. If ILD is confirmed, these agents should be permanently discontinued and appropriate measures should be instituted. Treatment should be immediately withheld in patients diagnosed with ILD/pneumonitis and permanently discontinued if no other potential causes of ILD/pneumonitis have been identified.

Renal Dysfunction

Moderate:

acetaminophen / brompheniramine

The brompheniramine in acetaminophen / brompheniramine has a moderate potential interaction with Renal Dysfunction.

Limited pharmacokinetic data are available for the older, first-generation antihistamines. Many appear to be primarily metabolized by the liver, and both parent drugs and metabolites are excreted in the urine. Patients with renal and/or liver disease may be at greater risk for adverse effects from antihistamines due to drug and metabolite accumulation. Therapy with antihistamines should be administered cautiously in such patients. Lower initial dosages may be appropriate.

Thrombotic/Thromboembolic Disorder

Moderate:

abemaciclib

Abemaciclib has a moderate potential interaction with Thrombotic/Thromboembolic Disorder.

Venous thromboembolic events have been reported with the use of abemaciclib. Care should be exercised when using this agent in patients with risk factors or history of venous thromboembolic events. It is recommended to monitor patients for signs and symptoms of venous thrombosis and pulmonary embolism and treat as medically appropriate.

Urinary Retention

Moderate:

acetaminophen / brompheniramine

The brompheniramine in acetaminophen / brompheniramine has a moderate potential interaction with Urinary Retention.

Antihistamines often have anticholinergic activity, to which elderly patients are particularly sensitive. Therapy with antihistamines should be administered cautiously, if at all, in patients with preexisting conditions that are likely to be exacerbated by anticholinergic activity, such as urinary retention or obstruction; angle-closure glaucoma, untreated intraocular hypertension, or uncontrolled primary open-angle glaucoma; and gastrointestinal obstructive disorders. Conventional, first-generation antihistamines such as the ethanolamines (bromodiphenhydramine, carbinoxamine, clemastine, dimenhydrinate, diphenhydramine, doxylamine, phenyltoloxamine) tend to exhibit substantial anticholinergic effects. In contrast, the newer, relatively nonsedating antihistamines (e.g., cetirizine, fexofenadine, loratadine) reportedly have low to minimal anticholinergic activity at normally recommended dosages and may be appropriate alternatives.

More resources

abemaciclib

A total of 375 drugs are known to interact with abemaciclib.

acetaminophen / brompheniramine

A total of 779 drugs are known to interact with acetaminophen / brompheniramine.

Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor 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.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.