Interactions between Dacex-DM and Everolimus
1 drug interaction and 20 additional warnings found for the following 2 drugs:
- Dacex-DM (dextromethorphan/guaifenesin/phenylephrine)
- everolimus
Drug interactions
Minor drug interactions
Minor:
dextromethorphan everolimus
Applies to: Dacex-DM (dextromethorphan / guaifenesin / phenylephrine) and everolimus
Coadministration of everolimus with other drugs that are metabolized by CYP450 3A4 and/or CYP450 2D6 may theoretically result in elevated plasma concentrations of the coadministered drug(s). The mechanism is decreased drug clearance due to competitive inhibition of CYP450 3A4 and 2D6 activity by everolimus. While clinical data are lacking, the possibility of prolonged and/or increased pharmacologic effects of the drugs should be considered. The clinical significance is unknown.
References (3)
- Cerner Multum, Inc. "UK Summary of Product Characteristics."
- Cerner Multum, Inc. "Australian Product Information."
- Agencia Española de Medicamentos y Productos Sanitarios Healthcare (2008) Centro de información online de medicamentos de la AEMPS - CIMA. https://cima.aemps.es/cima/publico/home.html
Food/lifestyle interactions
Moderate food/lifestyle interactions
Moderate:
dextromethorphan Food/Lifestyle
Applies to: Dacex-DM (dextromethorphan / guaifenesin / phenylephrine)
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:
everolimus Food/Lifestyle
Applies to: everolimus
Generally avoid
Grapefruit juice may significantly increase the plasma concentrations of orally administered everolimus. The mechanism is inhibition of CYP450 3A4 and P-glycoprotein activity in the gut wall by certain compounds present in grapefruit.
Management
Patients treated with everolimus should avoid consumption of grapefruit and grapefruit juice.
References (1)
- (2009) "Product Information. Afinitor (everolimus)." Novartis Pharmaceuticals
Moderate:
phenylephrine Caffeine
Applies to: Dacex-DM (dextromethorphan / guaifenesin / phenylephrine)
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
17 potential interactions Applies to: 16 conditions, including High Cholesterol, Benign Prostatic Hyperplasia, Hyperthyroidism, Diabetes Mellitus, and Liver Disease.
Benign Prostatic Hyperplasia
Moderate:
Dacex-DM
The phenylephrine in Dacex-DM 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.
Brain Tumor
Moderate:
everolimus
Everolimus has a moderate potential interaction with Brain Tumor.
Inhibition of mTOR activity results in delays of wound healing and increases the occurrence of wound-related complications, which might require surgical intervention. Patients with central nervous system tumors (primary CNS tumor or metastases) and/or receiving anticoagulation therapy may be at an increased risk of developing intracerebral bleeding (including fatal outcomes). Caution is recommended when using these agents, particularly in the perioperative period.
Cardiovascular Conditions and Disorders
Major:
Dacex-DM
The phenylephrine in Dacex-DM 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:
Dacex-DM
The phenylephrine in Dacex-DM 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.
Coagulation Defects and Disorders
Moderate:
everolimus
Everolimus has a moderate potential interaction with Coagulation Defects and Disorders.
Inhibition of mTOR activity results in delays of wound healing and increases the occurrence of wound-related complications, which might require surgical intervention. Patients with central nervous system tumors (primary CNS tumor or metastases) and/or receiving anticoagulation therapy may be at an increased risk of developing intracerebral bleeding (including fatal outcomes). Caution is recommended when using these agents, particularly in the perioperative period.
Diabetes Mellitus
Moderate:
Dacex-DM
The phenylephrine in Dacex-DM 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.
Moderate:
everolimus
Everolimus has a moderate potential interaction with Diabetes Mellitus.
Elevations in serum blood glucose levels have been reported in patients taking inhibitors of mTOR (mammalian target of rapamycin). Monitoring of fasting serum glucose levels is recommended prior to the start of therapy and periodically thereafter. Clinicians should achieve control of glucose levels before initiating therapy with these agents.
Glaucoma/Intraocular Hypertension
Moderate:
Dacex-DM
The phenylephrine in Dacex-DM 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.
High Cholesterol
Moderate:
everolimus
Everolimus has a moderate potential interaction with High Cholesterol.
Elevations in cholesterol and triglyceride levels have been reported in patients taking inhibitors of mTOR (mammalian target of rapamycin). Monitoring of fasting lipid profile is recommended prior to the start of therapy and periodically thereafter. Clinicians should achieve control of lipid levels before initiating therapy with these agents.
Hyperthyroidism
Major:
Dacex-DM
The phenylephrine in Dacex-DM 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.
Immunodeficiency
Moderate:
everolimus
Everolimus has a moderate potential interaction with Immunodeficiency.
Hematologic abnormalities, including decreased levels of hemoglobin, lymphocytes, platelets, and white blood cell have been observed in patients taking everolimus. Caution is recommended when treating patients predisposed to hematologic changes. Periodic monitoring of complete blood count is recommended before starting therapy and periodically thereafter.
Infection
Moderate:
everolimus
Everolimus has a moderate potential interaction with Infection.
The immunosuppressant effect of inhibitors of mTOR (mammalian target of rapamycin) may decrease host resistance to infectious agents and may predispose patients to bacterial, fungal, viral, or protozoal infections, infections with opportunistic pathogens, and reactivation of viral infections. Therapy with these agents should be administered with caution in patients with an infection, particularly active infections or any untreated systemic fungal, bacterial, parasitic, or viral infection. It is recommended to complete the treatment of preexisting invasive fungal infections prior to starting treatment and if a diagnosis of invasive systemic fungal infection is made during treatment, discontinue and treat with appropriate antifungal therapy.
Liver Disease
Major:
everolimus
Everolimus has a major potential interaction with Liver Disease.
Everolimus exposure was increased in patients with mild (Child-Pugh class A), moderate (Child-Pugh class B), and severe (Child-Pugh class C) hepatic impairment. In patients with mild or moderate hepatic impairment, a dose reduction is recommended. Patients with severe hepatic impairment, everolimus may be used at a reduced dose if the desired benefit outweighs the risk.
Pheochromocytoma
Major:
Dacex-DM
The phenylephrine in Dacex-DM 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:
Dacex-DM
The phenylephrine in Dacex-DM 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.
Renal Dysfunction
Major:
everolimus
Everolimus has a major potential interaction with Renal Dysfunction.
Cases of renal failure, including acute renal failure and elevations of serum creatinine and proteinuria, some with a fatal outcome, have been observed in patients treated with inhibitors of mTOR (mammalian target of rapamycin). Therapy with these agents should be administered cautiously in patients with renal dysfunction, in particularly where patients have additional risk factors that may further impair renal function. Renal impairment is not expected to influence drug exposure, and no dosage adjustment is recommended in patients with renal impairment. Monitoring of renal function, including measurement of blood urea nitrogen (BUN), urinary protein, or serum creatinine, is recommended prior to the start of therapy and periodically thereafter.
Vaccination
Major:
everolimus
Everolimus has a major potential interaction with Vaccination.
The administration of live vaccines should be avoided during therapy with inhibitor of mTOR (mammalian target of rapamycin). It is recommended that close contact with individuals who have received live vaccines should be avoided because of the potential risk for shedding from the household contact and transmission to patient. It is recommended to be up-to-date with all required immunizations, as recommended by current immunization guidelines, before initiating therapy with these agents.
More resources
Dacex-DM
A total of 546 drugs are known to interact with Dacex-DM.
- Dacex-dm is in the drug class upper respiratory combinations.
- Dacex-dm is used to treat Cough and Nasal Congestion.
everolimus
A total of 703 drugs are known to interact with everolimus.
- Everolimus is in the following drug classes: mTOR inhibitors, selective immunosuppressants.
- Everolimus is used to treat the following conditions:
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
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