Advertisements

Cophartussin

Quick links to important sections

Cophartussin

Advertisements
Advertisements

Treatment option:

Medically reviewed

Laura Arias

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Advertisements

Overview of Cophartussin

Quick Facts

Property Description
Active Ingredients Dextromethorphan Hydrobromide, Guaifenesin, Terpin
Form Oral liquid (syrup/solution), Oral solid (tablet/capsule)
Pharmacological Class Antitussive and Expectorant Combination
Route of Administration Oral
Origin Synthetic and Semi-synthetic

Cophartussin: Defining the Combination Drug and Pharmacological Class

Cophartussin is classified as a fixed-dose combination pharmaceutical preparation designed for the comprehensive relief of cough and associated respiratory congestion. It belongs to the high-level Cough and cold preparations class, integrating agents with distinct therapeutic actions into one product. The medicine is primarily available for oral administration in various oral liquid or oral solid dosage forms. This combination formulation is clinically recognized for its dual capacity to treat different facets of respiratory discomfort simultaneously.

Composition and Origin: The Active Ingredients in Cophartussin

The efficacy of Cophartussin stems from the combination of three active ingredients: Dextromethorphan Hydrobromide, Guaifenesin, and Terpin. These primary components are generally synthetic or semi-synthetic in origin. Dextromethorphan Hydrobromide functions as an antitussive (cough suppressant) by acting centrally, while Guaifenesin serves as an expectorant and mucolytic agent. This specific triad represents a well-established formulation for addressing mixed cough symptoms, differing from simpler formulas that rely on only a single expectorant or antitussive.

General Therapeutic Purpose and Action

The general purpose of Cophartussin is to provide coordinated relief, typically sought by adults experiencing common breathing illnesses, by managing both the cough impulse and chest congestion. This is achieved through a dual mechanism: central cough suppression reduces the frequency and intensity of persistent, dry coughing, while the expectorant component actively works to increase the volume and decrease the viscosity of respiratory mucus. This combined effect helps to minimize the discomfort and physical strain associated with excessive mucus production and non-productive coughing.

Regulatory References

  1. DailyMed Label: Guaifenesin and Dextromethorphan HBr
Advertisements

What side effects are possible with Cophartussin?

Official Adverse Reaction Profile

The safety profile of Cophartussin, a combination of an antitussive and expectorants, is classified by regulatory bodies based on the frequency and the physiological system affected. Most commonly documented adverse reactions are linked to the Central Nervous System and the Gastrointestinal System.


Frequency-Classified Effects

The most frequently observed effects, classified as Common in regulatory documents, include somnolence (drowsiness), dizziness, headache, nausea, and vomiting. Less common or rare effects may involve hypersensitivity reactions (such as skin rash or urticaria) and episodes of confusion or excitation.


Serious Safety Constraints

The most critical safety constraint documented in official labeling is the potential for Serotonin Syndrome, a severe adverse reaction associated with the Dextromethorphan component. This risk is explicitly magnified when the medicine is used concurrently with specific medications, such as Monoamine Oxidase Inhibitors (MAOIs), leading to a strict contraindication for concurrent use or within 14 days of stopping MAOIs.


Population and Exposure Considerations

Official safety documents include specific notes for certain populations. Individuals with severe hepatic impairment are documented to be at increased risk of augmented CNS-related adverse effects. Furthermore, the risk of serious CNS consequences, including the potential for misuse and abuse, is noted to increase with doses exceeding the recommended therapeutic level, as defined in the regulatory labeling.

Advertisements

Overdose and Emergency Response

Overdose Manifestations and Severe Outcomes

The official regulatory profile for Cophartussin overdose details specific clinical manifestations primarily affecting the Central Nervous System (CNS) and the gastrointestinal system. Documented CNS signs include somnolence (drowsiness), confusion, agitation, dizziness, nystagmus (involuntary eye movement), and hypertonia (muscle stiffness). Gastrointestinal manifestations typically involve nausea, vomiting, and abdominal discomfort.

Serious and potentially life-threatening outcomes are explicitly documented. These include severe CNS depression leading to respiratory depression, seizures, and coma. A critical concern is the potential for Serotonin Syndrome, a severe adverse reaction characterized by mental status changes, hyperthermia, and muscular rigidity.

When and How to Seek Help

Regulatory guidance mandates that any suspected overdose requires immediate medical attention. Patients, or caregivers, must contact a poison control center or emergency services immediately, even if clinical signs are not yet apparent. Immediate help is required if severe signs like trouble breathing, seizures, or unresponsiveness occur.

Treatment, as described in official labeling, is primarily symptomatic and supportive. This management requires close hospital monitoring of vital signs, including the respiratory rate and blood pressure. Interventions may include administration of activated charcoal or the use of Naloxone for managing severe respiratory depression. Overdose in pediatric patients is noted to carry an increased risk of severe breathing complications.

Advertisements

Therapeutic Uses of Cophartussin

Cophartussin is formulated to address the dual symptomatic burden of acute respiratory illnesses. The combination is relevant for easing symptoms that interfere with daily comfort. It may provide supportive relief for symptoms that can interfere with daily functioning and is considered relevant in contexts involving heightened systemic burden where short-term symptomatic assistance is needed.


Easing the Irritating, Dry Cough Impulse

This medication may assist with managing symptom clusters related to a persistent, non-productive cough—the dry, frequent, and bothersome urge to cough. It is generally applied in addressing this distressing symptom, offering symptomatic relief that supports patients during episodes of heightened discomfort and contributes to improved comfort during periods of heightened symptoms.

Managing Thick Chest Congestion and Phlegm

Cophartussin is applicable within clinical settings that involve conditions marked by a buildup of viscous, excessive respiratory secretions, known as chest congestion. It is commonly used across domains where additional symptomatic support is needed for managing excessive secretions, and is relevant for easing the symptoms related to expectoration. This supports general well-being during symptomatic phases.


Quick Fact: Symptomatic Support
Target Symptoms: Symptoms related to a persistent, dry cough and thick, excessive chest mucus.
Primary Indication: Conditions associated with acute or disruptive episodes, such as the common cold.
Core Benefit: Supports comfort and functional stability during periods of heightened symptoms.

Regulatory References

  1. NIH DailyMed resource on combination products
Advertisements

Eligibility and Restrictions for Use

Cophartussin is defined as eligible or ineligible for use based strictly on mandatory regulatory criteria, including patient characteristics, age, and concurrent health status. This information is derived from official government labeling, such as FDA and EMA documents, and does not constitute medical advice.

Populations for Whom Use is Prohibited or Conditional

Category Official Regulatory Statement
Absolute Contraindications Use is prohibited for individuals with known hypersensitivity to the drug or its components. It is also strictly contraindicated if the patient is currently taking a Monoamine Oxidase Inhibitor (MAOI), or has discontinued one within the past 14 days (due to a serious drug-interaction risk).
Age Restrictions Use is not established and generally not recommended for children under 12 years of age, with stricter contraindications typically applying to those under 4 or 6 years. The approved population generally begins at 12 years and older.
Conditional Use Patients with severe hepatic impairment or severe renal impairment require special consideration; use may be avoided or necessitate dose adjustment as per regulatory guidance.
Pregnancy/Lactation Use during pregnancy is typically permitted with alcohol-free formulations but should be assessed by a healthcare provider. Use during lactation/breastfeeding is generally not recommended due to limited safety data.
Advertisements

What should I know about interactions with other medicines?

Cophartussin, which contains dextromethorphan, is associated with several serious drug-drug interactions that are officially documented in regulatory labeling. The most critical interaction is with Monoamine Oxidase Inhibitors (MAOIs), which are contraindicated for use with this product. Taking Cophartussin concurrently with an MAOI, or within 14 days of stopping one, carries a high risk of developing Serotonin Syndrome—a potentially life-threatening reaction.

Caution is also required when using Cophartussin with other serotonergic drugs, including Selective Serotonin Reuptake Inhibitors (SSRIs), Serotonin-Norepinephrine Reuptake Inhibitors (SNRIs), and Tricyclic Antidepressants (TCAs), as this combination can increase the risk of Serotonin Syndrome.

Furthermore, the drug is metabolized in the liver by the enzyme CYP2D6. Concomitant use with strong inhibitors of this enzyme, such as certain quinidine, fluoxetine, or paroxetine, can significantly increase the concentration of Cophartussin in the bloodstream. This may lead to exaggerated or prolonged effects and increase the potential for adverse reactions. Patients are also advised to avoid alcohol and other central nervous system (CNS) depressants due to the risk of additive sedation, dizziness, and respiratory depression. Always check product labels to avoid accidental doubling of dextromethorphan dose from other cough or cold preparations.

Advertisements

Mechanism of Action

Central Nervous System (CNS) Pathway Modulation

Cophartussin exerts its primary action within the brain, specifically by modulating activity in the brainstem's cough center. This mechanism operates within systems defined by heightened signal transmission, leading to attenuation of the involuntary cough reflex signaling.


Dual-Receptor Mechanism of Interaction

The drug functions by engaging two distinct protein targets: the Sigma-1 receptor (sigma1) as an agonist and the NMDA receptor as a non-competitive antagonist. This combined action restricts the propagation of excessive neural activity within the cough pathway, which results in altered neuronal circuit stabilization and alters the neuronal firing threshold for afferent signals. The molecular interference in the brainstem alters the natural physiological regulation of the cough reflex arc.

Advertisements

Dosage and Administration Information

How to use Cophartussin

Cophartussin is administered exclusively via the oral route and is available in multiple formulations, including Immediate-Release (IR) liquids and Extended-Release (ER) tablets. The official dosing schedule differs based on the formulation chosen.

The IR forms have a typical administration frequency of every 4 hours as needed, not to exceed six doses per 24 hours. The ER tablets are designed for a 12-hour dosing interval, administered every 12 hours, with a maximum of two doses per day. Regardless of the form, the total daily intake must not surpass 120 mg of Dextromethorphan HBr and 2400 mg of Guaifenesin within a 24-hour period.

Procedural instructions clarify that the medicine may be taken without regard to the timing of meals. Oral solid forms should be consumed with a full glass of water. For the ER tablets, a special procedural condition exists: they must not be crushed, chewed, or broken to preserve the sustained-release mechanism. Liquid forms require a calibrated measuring device for accurate dosing.

The product is intended for short-term use and should not be administered for more than seven days. Population-specific rules state that many ER formulations are not recommended for children under 12 years of age, though specific, lower IR doses are established for younger pediatric groups in the official labeling.

Advertisements

Recent Clinical Evidence

Cophartussin: Recent Clinical Evidence


Evidence for Use in Temporary Cough Relief

Research has explored Cophartussin's use in conditions associated with acute or disruptive episodes, such as coughs related to the common cold. These studies were primarily Randomized Controlled Trials (RCTs), a standard design used in research exploring how symptoms change over time. Research examined outcomes related to physical discomfort, such as cough frequency and severity, often using patient-reported outcomes describing perceived discomfort.

Studies report how symptoms evolved in the observed populations over short time intervals, often a few hours or days. Findings were mixed across these short-term studies, and data show patterns related to symptom evolution, with different reported measurements across trials. Study results reflect the specific conditions under which they were conducted.

Evidence in Special Study Populations and Research Gaps

Cophartussin was studied for use in a variety of patient groups, including some pediatric groups. However, data for certain groups remain insufficient, such as for pregnant individuals. The major limitation is that follow-up durations were limited, which means there is limited information for long-term outcomes regarding the effects of prolonged or repeated use. Comparative evidence is lacking in some areas, and research is ongoing regarding how individual patient genetics may influence the medicine, which may contribute to findings being mixed between individuals. The available evidence highlights what is known—and what is still uncertain.

Key Studies & References

  1. Systematic review of randomized controlled trials of over the counter cough medicines for acute cough in adults
  2. Honey for acute cough in children (Cochrane Review)
  3. Assessment of antitussive efficacy of dextromethorphan in smoking related cough: objective vs. subjective measures
  4. Dextromethorphan Plus Ultra Low-Dose Quinidine Reduces Pseudobulbar Affect (Key Phase 3 Trial)
  5. Cough (acute): antimicrobial prescribing (NICE Guideline NG120) - Summary of the evidence
  6. Dextromethorphan (Review of approved indications and safety data) - StatPearls
Advertisements

Frequently Asked Questions (FAQ)

Common questions about Cophartussin (FAQ)

Q: Is Cophartussin effective for coughs caused by asthma or smoking?

Official regulatory labeling indicates that a persistent or chronic cough should be assessed by a healthcare provider before Cophartussin is used.

This guidance includes coughs associated with conditions like smoking, asthma, chronic bronchitis, or emphysema. The label highlights that professional assessment may be required for these specific types of coughs.


Q: What are the official signs of an allergic reaction to Cophartussin?

According to official regulatory documents, signs of an allergic reaction that require attention include skin reactions such as rash or hives, swelling of the face, lips, tongue, or throat, or severe itching.

Additionally, signs can include difficulty breathing or an unusual hoarseness. These signs are associated with severe reactions and typically indicate a need for professional medical attention.


Q: What is the expected duration of Cophartussin's cough-relief effects?

The expected duration of relief for Cophartussin is derived from the product's recommended dosing schedule, as stated in the official information.

For Immediate-Release (IR) forms, the dosing frequency suggests a typical duration of approximately 4 hours. For the Extended-Release (ER) tablets, the medicine is formulated to provide relief over approximately 12 hours.


Q: Is Cophartussin appropriate for use by older adults?

Official information indicates that the medicine has not been specifically studied across the older adult population.

However, Cophartussin is not currently expected to cause different side effects or problems in older adults compared to younger adults when taken as described in the official instructions. Consultation with a healthcare provider allows for confirmation of suitability based on individual health status.


Q: What are the specific warnings for Cophartussin use in people with chronic lung diseases?

Regulatory labeling indicates that a persistent or chronic cough associated with certain lung diseases should be assessed by a healthcare provider before Cophartussin is used.

Specific conditions highlighted in the official warnings include chronic bronchitis and emphysema. This precaution ensures the appropriateness of the medicine is evaluated by a professional.


Q: Is Cophartussin considered a narcotic, a synthetic opioid, or neither?

The active ingredient, Dextromethorphan, is chemically a non-opioid derivative of morphine, and it is related to codeine, but it is not classified as a narcotic.

Regulatory information indicates that at therapeutic doses, the medicine is devoid of analgesic (pain-relieving) or addictive properties. It functions as a cough suppressant, not a pain medication.


Q: What should be done if a scheduled dose of Cophartussin is missed?

According to the official patient information leaflet, if a dose is missed, regulatory guidance suggests taking it as soon as it is remembered.

However, if it is almost time for the next dose, the missed dose should be skipped entirely. Regulatory information specifies that double doses should not be taken, nor should extra medication be used to compensate for a missed dose.


Q: Does Cophartussin affect the results of certain common drug screening tests?

Studies suggest that Dextromethorphan, the antitussive in Cophartussin, may cause false-positive results on some initial urine screening tests.

This interference can sometimes be mistaken for substances like Phencyclidine (PCP) or, at high intake levels, for opiates. If a false-positive occurs, a confirmation test is typically required to differentiate the drug.


Q: What is the meaning of Cophartussin's half-life and why does it vary by person?

The time it takes for Cophartussin's effects to decline (its half-life) varies greatly among people because of how it is processed by the body.

This is due to genetic variations in a liver enzyme called CYP2D6, which is responsible for metabolizing the drug. These differences in metabolism are known to cause large individual variability in how quickly the medicine is cleared from the bloodstream.


Q: Does Cophartussin contain common inactive ingredients like gluten, lactose, or sugar?

Official labeling for the solid forms of Cophartussin lists inactive ingredients like microcrystalline cellulose but does not always specify common allergens like gluten or lactose.

Liquid formulations often contain inactive ingredients like alcohol or sugar, which may require caution for specific patient groups. For specific dietary concerns, the full product label or the patient information leaflet provides a complete list of inactive ingredients.


Q: Is it safe to take Cophartussin if I am already taking an antihistamine?

Official warnings note that Cophartussin should not be used with other cold or allergy medications without specific oversight from a healthcare provider.

This warning exists because combining the drug with other Central Nervous System (CNS) depressants, such as many antihistamines, can lead to additive side effects like increased sedation or dizziness.


Q: Is Cophartussin available in different formulations, such as liquid, tablet, or lozenge?

Regulatory documents list that Cophartussin is officially available in several common dosage forms for oral administration.

These include liquid (syrup or solution), tablets, caplets, and capsules. The availability of a lozenge form may vary.

Advertisements

How should Cophartussin be stored and disposed of?

How to Store and Dispose of Cophartussin

Storage and disposal of Cophartussin (a combination antitussive and expectorant) must adhere to official regulatory requirements to ensure product quality and safety.

Storage Conditions

Requirement Official Instruction
Temperature Store at Controlled Room Temperature, 20 C to 25 C (68 F to 77 F).
Protection Keep away from excess heat and moisture and protect from light.
Handling Liquid forms must not be frozen and the bottle must be shaken well before use.
Container Keep in the original container and maintain it tightly closed.
Child Safety Store the medication strictly out of the sight and reach of children.

Disposal Instructions

Unused or expired Cophartussin should be disposed of via an official drug take-back program or by following household disposal guidelines for non-flushing medicines, which involves mixing the medicine with an unappealing substance and sealing it before discarding. The product must not be poured down a sink or toilet (wastewater).

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

Available in countries:

Equivalent of Cophartussin found in:

A-Z Index: