Acetaminophen, Isometheptene, and Dichloralphenazone
Medically reviewed on Sep 10, 2018
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- Acetaminophen, Dichloralphenazone, and Isometheptene
- Dichloralphenazone, Acetaminophen, and Isometheptene
- Dichloralphenazone, Isometheptene, and Acetaminophen
- Isometheptene, Acetaminophen, and Dichloralphenazone
- Isometheptene, Dichloralphenazone, and Acetaminophen
Excipient information presented when available (limited, particularly for generics); consult specific product labeling. [DSC] = discontinued product
Nodolor: Acetaminophen 325 mg, isometheptene mucate 65 mg, and dichloralphenazone 100 mg [DSC]
Generic: Acetaminophen 325 mg, isometheptene mucate 65 mg, and dichloralphenazone 100 mg [DSC]
Brand Names: U.S.
- Nodolor [DSC]
- Analgesic, Nonopioid
Acetaminophen: Although not fully elucidated, the analgesic effects are believed to be due to activation of descending serotonergic inhibitory pathways in the CNS. Interactions with other nociceptive systems may be involved as well (Smith 2009). Antipyresis is produced from inhibition of the hypothalamic heat-regulating center.
Dichloralphenazone: Prodrug, converted to chloral hydrate (sedative) and antipyrine (analgesic/antipyretic) that reduces patient’s emotional response to painful stimuli
Isometheptene: A sympathomimetic that reduces stimuli leading to vascular headaches via constriction of dilated cranial and cerebral arterioles
Use: Labeled Indications
Headache: Relief of tension headache and vascular headache (potentially effective for relief of migraine headache).
Hypersensitivity to isometheptene, dichloralphenazone, acetaminophen, or any component of the formulation; cardiovascular or cerebrovascular insufficiency (eg, recent MI, stroke); glaucoma; severe renal disease; hypertension; organic heart disease; peripheral vascular disease; hepatic disease; concomitant monoamine oxidase inhibitor (MAOI) therapy
Migraine headache: Oral: Two capsules to start, followed by 1 capsule every hour until relief is obtained (maximum: 5 capsules/12 hours)
Tension headache: Oral: 1 to 2 capsules every 4 hours (maximum: 8 capsules/24 hours)
Refer to adult dosing.
Dosing: Renal Impairment
Use is contraindicated in patients with severe renal disease.
Dosing: Hepatic Impairment
Use is contraindicated in patients with hepatic disease.
Administer without regard to food.
Store at 15°C to 30°C (59°F to 86°F).
Alcohol (Ethyl): May enhance the hepatotoxic effect of Acetaminophen. Monitor therapy
Alpha1-Blockers: May diminish the vasoconstricting effect of Alpha-/Beta-Agonists. Similarly, Alpha-/Beta-Agonists may antagonize Alpha1-Blocker vasodilation. Monitor therapy
AtoMOXetine: May enhance the hypertensive effect of Sympathomimetics. AtoMOXetine may enhance the tachycardic effect of Sympathomimetics. Monitor therapy
Barbiturates: May increase the metabolism of Acetaminophen. This may 1) diminish the effect of acetaminophen; and 2) increase the risk of liver damage. Exceptions: Amobarbital; Butabarbital; Butalbital; Methohexital; PENTobarbital; Secobarbital; Thiopental. Monitor therapy
Busulfan: Acetaminophen may increase the serum concentration of Busulfan. Monitor therapy
Cannabinoid-Containing Products: May enhance the tachycardic effect of Sympathomimetics. Exceptions: Cannabidiol. Monitor therapy
CarBAMazepine: May increase the metabolism of Acetaminophen. This may 1) diminish the effect of acetaminophen; and 2) increase the risk of liver damage. Monitor therapy
Chloroprocaine: May enhance the hypertensive effect of Alpha-/Beta-Agonists. Monitor therapy
Cocaine (Topical): May enhance the hypertensive effect of Sympathomimetics. Management: Consider alternatives to use of this combination when possible. Monitor closely for substantially increased blood pressure or heart rate and for any evidence of myocardial ischemia with concurrent use. Consider therapy modification
Dapsone (Topical): May enhance the adverse/toxic effect of Methemoglobinemia Associated Agents. Monitor therapy
Dasatinib: Acetaminophen may enhance the hepatotoxic effect of Dasatinib. Dasatinib may increase the serum concentration of Acetaminophen. Consider therapy modification
Doxofylline: Sympathomimetics may enhance the adverse/toxic effect of Doxofylline. Monitor therapy
Ergot Derivatives: May enhance the hypertensive effect of Alpha-/Beta-Agonists. Ergot Derivatives may enhance the vasoconstricting effect of Alpha-/Beta-Agonists. Exceptions: Ergoloid Mesylates; Nicergoline. Avoid combination
Flucloxacillin: May enhance the adverse/toxic effect of Acetaminophen. Specifically, the risk for high anion gap metabolic acidosis may be increased. Monitor therapy
Fosphenytoin-Phenytoin: May decrease the serum concentration of Acetaminophen. Specifically, serum concentrations of acetaminophen may be decreased (leading to decreased efficacy), but the formation of the toxic N-acetyl-p-benzoquinone imine (NAPQI) metabolite may be increased (leading to increased hepatotoxicity). Monitor therapy
Guanethidine: May enhance the arrhythmogenic effect of Sympathomimetics. Guanethidine may enhance the hypertensive effect of Sympathomimetics. Monitor therapy
Imatinib: Acetaminophen may enhance the hepatotoxic effect of Imatinib. Monitor therapy
Isoniazid: May enhance the adverse/toxic effect of Acetaminophen. Monitor therapy
LamoTRIgine: Acetaminophen may decrease the serum concentration of LamoTRIgine. Monitor therapy
MetyraPONE: May increase the serum concentration of Acetaminophen. More importantly, by inhibiting the conjugative metabolism of acetaminophen, metyrapone may shift the metabolism towards the oxidative route that produces a hepatotoxic metabolite. Monitor therapy
Mipomersen: Acetaminophen may enhance the hepatotoxic effect of Mipomersen. Monitor therapy
Monoamine Oxidase Inhibitors: May enhance the adverse/toxic effect of Isometheptene. Avoid combination
Nitric Oxide: May enhance the adverse/toxic effect of Methemoglobinemia Associated Agents. Combinations of these agents may increase the likelihood of significant methemoglobinemia. Management: Monitor patients for signs of methemoglobinemia (e.g., hypoxia, cyanosis) when nitric oxide is used in combination with other agents associated with development of methemoglobinemia. Avoid lidocaine/prilocaine. Monitor therapy
Phenylephrine (Systemic): Acetaminophen may increase the serum concentration of Phenylephrine (Systemic). Monitor therapy
Prilocaine: Methemoglobinemia Associated Agents may enhance the adverse/toxic effect of Prilocaine. Combinations of these agents may increase the likelihood of significant methemoglobinemia. Management: Monitor patients for signs of methemoglobinemia (e.g., hypoxia, cyanosis) when prilocaine is used in combination with other agents associated with development of methemoglobinemia. Avoid lidocaine/prilocaine in infants receiving such agents. Monitor therapy
Probenecid: May increase the serum concentration of Acetaminophen. Probenecid may also limit the formation of at least one major non-toxic metabolite, possibly increasing the potential for formation of the toxic NAPQI metabolite. Consider therapy modification
Serotonin/Norepinephrine Reuptake Inhibitors: May enhance the tachycardic effect of Alpha-/Beta-Agonists. Serotonin/Norepinephrine Reuptake Inhibitors may enhance the vasopressor effect of Alpha-/Beta-Agonists. Consider therapy modification
Sodium Nitrite: Methemoglobinemia Associated Agents may enhance the adverse/toxic effect of Sodium Nitrite. Combinations of these agents may increase the likelihood of significant methemoglobinemia. Monitor therapy
SORAfenib: Acetaminophen may enhance the hepatotoxic effect of SORAfenib. SORAfenib may increase the serum concentration of Acetaminophen. Consider therapy modification
Spironolactone: May diminish the vasoconstricting effect of Alpha-/Beta-Agonists. Monitor therapy
Sympathomimetics: May enhance the adverse/toxic effect of other Sympathomimetics. Monitor therapy
Tetracaine (Topical): May enhance the adverse/toxic effect of Methemoglobinemia Associated Agents. Monitor therapy
Tricyclic Antidepressants: May enhance the vasopressor effect of Alpha-/Beta-Agonists (Direct-Acting). Management: Avoid, if possible, the use of direct-acting alpha-/beta-agonists in patients receiving tricyclic antidepressants. If combined, monitor for evidence of increased pressor effects and consider reductions in initial dosages of the alpha-/beta-agonist. Consider therapy modification
Vitamin K Antagonists (eg, warfarin): Acetaminophen may enhance the anticoagulant effect of Vitamin K Antagonists. This appears most likely with daily acetaminophen doses exceeding 1.3 or 2 g/day for multiple consecutive days. Monitor therapy
Acetaminophen may cause false urine glucose, urine catecholamine, and urinary 5-hydroxyindoleacetic acid test results.
Frequency not defined.
Central nervous system: Dizziness (transient)
Dermatologic: Skin rash
Concerns related to adverse events:
• CNS depression: May cause CNS depression, which may impair physical or mental abilities; patients must be cautioned about performing tasks that require mental alertness (eg, operating machinery or driving).
• Hepatotoxicity: [U.S. Boxed Warning]: Acetaminophen may cause severe hepatotoxicity, potentially requiring liver transplant or resulting in death; hepatotoxicity is usually associated with excessive acetaminophen intake (>4 g/day). Risk is increased with alcohol use (eg, ≥3 drinks per day), preexisting liver disease, and intake of more than one source of acetaminophen-containing medications. Chronic daily dosing in adults has also resulted in liver damage in some patients.
• Hypersensitivity: Hypersensitivity and anaphylactic reactions have been reported with acetaminophen use; discontinue immediately if symptoms of allergic or hypersensitivity reactions occur.
• Skin reactions: Rarely, acetaminophen may cause serious and potentially fatal skin reactions such as acute generalized exanthematous pustulosis, Stevens-Johnson syndrome (SJS), and toxic epidermal necrolysis (TEN). Discontinue treatment if severe skin reactions develop.
Concurrent drug therapy issues:
• Drug-drug interactions: Potentially significant interactions may exist, requiring dose or frequency adjustment, additional monitoring, and/or selection of alternative therapy. Consult drug interactions database for more detailed information.
• Cardiovascular disease: Use is contraindicated in cardiovascular or cerebrovascular insufficiency (eg, recent MI, stroke), hypertension, organic heart disease, and peripheral vascular disease.
• G6PD deficiency: Use with caution in patients with known G6PD deficiency; rare reports of hemolysis have occurred with acetaminophen use.
• Hepatic impairment: Use is contraindicated in patients with hepatic disease.
• Renal impairment: Use is contraindicated in patients with severe renal disease.
• Dosage limit: Limit acetaminophen dose from all sources (prescription, OTC) ≤4 g/day (adults).
Relief of pain
• Discuss specific use of drug and side effects with patient as it relates to treatment. (HCAHPS: During this hospital stay, were you given any medicine that you had not taken before? Before giving you any new medicine, how often did hospital staff tell you what the medicine was for? How often did hospital staff describe possible side effects in a way you could understand?)
• Patient may experience dizziness, fatigue, or nausea. Have patient report immediately to prescriber signs of liver problems (dark urine, fatigue, lack of appetite, nausea, abdominal pain, light-colored stools, vomiting, or jaundice), or signs of Stevens-Johnson syndrome/toxic epidermal necrolysis (red, swollen, blistered, or peeling skin [with or without fever]; red or irritated eyes; or sores in mouth, throat, nose, or eyes) (HCAHPS).
• Educate patient about signs of a significant reaction (eg, wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat). Note: This is not a comprehensive list of all side effects. Patient should consult prescriber for additional questions.
Intended Use and Disclaimer: Should not be printed and given to patients. This information is intended to serve as a concise initial reference for healthcare professionals to use when discussing medications with a patient. You must ultimately rely on your own discretion, experience and judgment in diagnosing, treating and advising patients.
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- Acetaminophen, dichloralphenazone, and isometheptene
- Acetaminophen, Isometheptene, and Dichloralphenazone