Codterpin

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Codterpin

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Method of action: Analgesic, Antitussive

Treatment option:

Medically reviewed

Marina Burgos

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.

Overview of Codterpin

Quick Facts

Property Description
Active Ingredients Codeine, Terpinhydrate, Sodium Hydrocarbonate
Form Tablet (Oral Solid)
Pharmacological Class Antitussive and Expectorant Combination
Common Use Symptomatic relief of cough
Origin Semisynthetic (Codeine) and Synthetic

Codterpin is an oral Fixed-Dose Combination (FDC) drug provided as a tablet, classified as a combination cough and cold preparation that functions with dual antitussive and expectorant properties. This multicomponent structure is designed to deliver integrated relief by simultaneously addressing the central cough reflex and promoting the clearance of respiratory secretions. This specific formulation is clinically recognized for addressing both the irritation and secretion aspects of cough, a key differentiator from single-agent formulations.

Active Composition and Classification

The medicine's function is derived from its three main active substances. Codeine acts as a semisynthetic opioid analgesic and is the primary central cough suppressant component. This component belongs to the class of narcotic antitussives. Terpinhydrate is included for its expectorant properties, which help to liquefy and facilitate the elimination of bronchial secretions. Sodium Hydrocarbonate acts as an alkalizing agent. Its presence is often considered to support the expectorant mechanism by modifying the pH environment of the mucus.

General Therapeutic Purpose

The core purpose of Codterpin is to ensure integrated management of the cough symptom by combining suppression and clearance. Codeine suppresses the cough reflex by affecting the cough center in the brainstem. This means the medicine helps to diminish the frequency and intensity of persistent, irritating coughs. The combined action provides the therapeutic benefit of quietening the cough while simultaneously aiding the body in clearing the airways. This makes the preparation particularly useful for the comprehensive symptomatic relief associated with Respiratory tract disorders.

What side effects are possible with Codterpin?

Possible Side Effects and Safety Information

The safety profile for Codterpin, a combination product, is largely determined by its codeine component. Officially documented adverse reactions are categorized by frequency and the body system affected, consistent with regulatory standards.


Frequency and System-Organ Classification

The most frequently encountered effects are generally classified as Common, occurring in the Nervous System and Gastrointestinal Disorders. These Common adverse reactions typically include nausea, vomiting, constipation, dizziness, and sedation (drowsiness). Less frequently observed reactions, categorized as Uncommon, include various forms of hypersensitivity (e.g., rash) and dry mouth.


Serious Adverse Reactions

Regulatory agencies document certain reactions as serious and clinically significant. The most critical risk is respiratory depression, a serious adverse reaction potentially linked to the metabolism of codeine, which can be life-threatening. The development of physical dependence is also officially documented as a risk associated with prolonged use.


Population-Specific Safety Considerations

The medicine carries significant restrictions for specific populations. Use is officially prohibited in children under 12 years due to the severe and life-threatening risk of respiratory depression, as mandated by government health authorities. It is also contraindicated for breastfeeding mothers and individuals who are known ultrarapid metabolizers of codeine. Furthermore, effects such as drowsiness are noted to be more pronounced at the beginning of treatment.

These safety classifications and restrictions establish the boundaries of safe use, defining both the expected common effects and the rare but critical risks associated with the medicine.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory documentation for Codterpin's active components, primarily codeine, defines the overdose profile by its potential for life-threatening central nervous system (CNS) and respiratory depression.

Overdose Manifestations Severe Outcomes and Actions
Signs: Profound sedation, miosis (pinpoint pupils), low blood pressure, cold/clammy skin, and slow or shallow breathing. Severe Outcomes: Life-threatening respiratory depression, coma, and circulatory shock, which may lead to death.
Exposure: Accidental ingestion of even a single dose can be fatal, particularly in children. Action: Immediate medical attention must be sought by contacting emergency services (911) when overdose is suspected.

Official Regulatory Statements

The primary danger of overdose is the severe risk of respiratory depression and CNS collapse. Regulatory prescribing information explicitly notes that certain populations, including children and ultra-rapid metabolizers, face a heightened risk of fatal outcomes. Urgent medical attention is required for all suspected overdose cases.

Emergency treatment procedures described in official guidance include the need for supportive measures, such as breathing assistance (ventilation) and the administration of the opioid antagonist Naloxone to reverse the depressive effects. Monitoring of vital signs, including blood pressure and respiratory rate, is also a documented requirement in the overdose setting.

Therapeutic Uses of Codterpin

Codterpin: Main Uses and Benefits

Codterpin is a combination medicinal product. It is used to provide relief from cough and for the management of acute moderate pain. The uses are related to its dual active components. The codeine component, an opioid, works centrally to decrease the cough reflex, classifying it as an antitussive (cough suppressant). This property addresses persistent coughing that may affect rest or daily activities.


For pain management, the codeine component also functions as an analgesic to reduce the perception of discomfort for short-term, acute moderate pain that is not adequately relieved by other non-opioid medications. The therapeutic benefit is to provide sufficient pain relief in these specific instances.


Quick Facts

  • Relief from cough
  • Management of acute moderate pain

Regulatory References

  1. FDA MedlinePlus guidance

Eligibility and Restrictions for Use

Who Can and Cannot Use Codterpin?

The eligibility for using codeine-containing products is strictly defined by patient age, specific surgical history, genetic metabolic factors, and pre-existing respiratory conditions, as established in official regulatory labeling.


Eligibility Domain Official Restriction Classification
Pediatric Age Use is prohibited in children younger than 12 years of age Contraindicated
Post-Surgical Status Prohibited in adolescents under 18 years following tonsillectomy and/or adenoidectomy Contraindicated
Genetic Metabolism Prohibited in patients identified as CYP2D6 ultra-rapid metabolizers Contraindicated
Respiratory Impairment Prohibited in patients with acute or severe bronchial asthma or acute respiratory depression Contraindicated
Lactation Status Use is not recommended for breastfeeding women Not Recommended

Official regulatory documents define the eligible population as adults and adolescents 12 years of age and older who do not possess these documented risk factors. The rules establish strict prohibitions (contraindications) based on age, surgical history, genetic profile, and pre-existing respiratory disease. Use is also advised against for breastfeeding women.

What should I know about interactions with other medicines?

Codterpin (containing codeine) interacts with several medication classes, primarily impacting the Central Nervous System (CNS) or the drug's metabolism.

Contraindicated Combinations

Concurrent use with Monoamine Oxidase Inhibitors (MAOIs) is absolutely contraindicated; this restriction also applies for 14 days after stopping an MAOI. Codterpin is also contraindicated in CYP2D6 ultra-rapid metabolizers of any age, as well as in breastfeeding mothers, due to the risk of life-threatening respiratory depression from high morphine levels.

Major Interaction Categories

Category Mechanism & Restriction Clinical Significance
CNS Depressants (Benzodiazepines, Alcohol, Sedatives) Causes additive CNS depression, risking profound sedation, respiratory depression, coma, and death. Reserve Concomitant Use for when alternatives are inadequate.
Serotonergic Drugs (e.g., SSRIs, Triptans) Pharmacodynamic interaction that may result in Serotonin Syndrome. Monitor Closely at initiation or dose change.
CYP2D6/CYP3A4 Inhibitors & Inducers Alters the metabolism of codeine to its active metabolite (morphine), leading to either reduced efficacy (CYP2D6 inhibitors) or increased toxicity (CYP3A4 inhibitors). Requires Careful Consideration and monitoring for altered effects.
Mixed Agonist/Antagonist Opioids (e.g., Pentazocine) May reduce Codterpin's effect or precipitate withdrawal symptoms. Avoid Use.

Note: This information is strictly based on official government regulatory documents detailing mandatory usage constraints and monitoring requirements.

Mechanism of Action

Codterpin contains codeine, a pro-drug that undergoes O-demethylation primarily via the cytochrome P450 enzyme CYP2D6 in the liver. This metabolic process yields the active metabolite, morphine. Both codeine (to a weak extent) and morphine function as agonists at the mu-opioid receptors (MOR), which are G protein-coupled receptors distributed throughout the central nervous system (CNS), including the medulla and the periaqueductal gray area.

Binding to the MOR activates inhibitory G-proteins (Gi/o), initiating an intracellular cascade. This activation leads to a reduction in intracellular cAMP concentration and the opening of potassium channels, resulting in hyperpolarization of the neuronal membrane. Furthermore, it inhibits voltage-gated calcium channels, which subsequently reduces the presynaptic release of excitatory and nociceptive neurotransmitters, such as substance P and glutamate.

At the system level, MOR agonism within the CNS modulates neuronal activity in the regions responsible for cough reflex suppression and pain signal transmission, leading to a decrease in the excitability of these neural circuits.

Dosage and Administration Information

How to Use Codterpin

The usage of Codterpin, an oral fixed-dose combination (FDC) tablet containing codeine, terpinhydrate, and sodium hydrocarbonate, follows specific administration principles. These focus on using the lowest effective dose for the shortest possible duration, particularly due to the codeine component.


Administration Guidelines

Feature Guideline
Route of Administration Oral use only.
Dosing Schedule The codeine component dose typically ranges from 15 mg to 60 mg for pain relief, or 15 mg to 30 mg for cough suppression.
Frequency and Timing Doses may be repeated every 4 to 6 hours as needed, but the total intake must not exceed the maximum recommended daily dose.
Food Relationship May be taken with or without food.

Procedural and Time Constraints

The medicine is structured for short-term use only. Parameters for the management of acute pain specify that treatment is limited to 3 days. The total 24-hour dose of the codeine component must not exceed 240 mg.

Population-Specific Rules

Administration is contraindicated in children younger than 12 years of age. Furthermore, dosage is reduced in older adults or patients with severe hepatic or renal function impairment to adhere to safety protocols.

Recent Clinical Evidence

Codterpin: Recent Clinical Evidence

Evidence for Symptomatic Relief of Cough

Research for the codeine component focuses on short-term Randomized Controlled Trials (RCTs) and scientific reviews in adults experiencing episodic cough. Studies monitored cough frequency and intensity, but findings related to the measurement of cough characteristics have often been mixed across trials. Some trials described patterns where measurements were not significantly distinct from those reported by participants receiving an inactive substance (placebo). Consequently, certainty remains low due to the inconsistent findings across the research base, and long-term outcomes are not fully established.


Evidence for Management of Acute Moderate Pain

Research examined the component in settings related to acute moderate pain primarily through single-dose RCTs. These studies monitored patient-reported outcomes describing perceived discomfort in adults with acute pain, such as post-surgical pain. Studies observed how measurements of pain intensity evolved over immediate time intervals (typically 4 to 6 hours). The relevant evidence often focuses on codeine when it was studied in combination with other pain relievers, rather than codeine as a standalone component, and does not address patterns after repeated or longer-term use.


Research on the Expectorant Component and Gaps

The terpinhydrate component was evaluated using historical data and preclinical models; contemporary evidence from modern clinical trials is limited. Studies explored outcomes related to mucus consistency. Official regulatory reviews in some jurisdictions have indicated that existing data were considered insufficient to establish its status based on contemporary evidence standards. Overall, the evidence base is limited by short follow-up durations. Research so far indicates that data for certain groups, such as older adults or those with various comorbid conditions, remain insufficient.

Key Studies & References Codeine prescription pattern and treatment responses in patients with chronic cough: a routinely collected institutional database analysis

Frequently Asked Questions (FAQ)

Common questions about Codterpin (FAQ)


Q: How long does it typically take for Codterpin to start working?

Studies on the way the body processes the medicine, known as pharmacokinetics, indicate that the codeine component reaches its maximum concentration in the blood approximately one hour after administration. This timeframe indicates when the codeine component reaches its maximum concentration in the blood.


Q: Can Codterpin interact with herbal supplements like St. John's Wort?

Regulatory documents mention that St. John’s Wort and other serotonergic drugs have the potential to interact with the codeine component of this medicine. Official information indicates that co-administration may require monitoring due to potential risks, such as Serotonin Syndrome.


Q: Does Codterpin interact with birth control pills?

Official government regulatory documents do not list hormonal contraceptives (birth control pills) among the major categories of medicines that are contraindicated or restricted when taking Codterpin.


Q: Is it normal to experience a headache when first starting Codterpin?

Yes, headache is listed in the official product information as a potential side effect associated with the codeine component of the medicine.


Q: What happens if I accidentally miss a dose of Codterpin?

Because this medicine is typically taken only as needed, regulatory guidance suggests skipping the missed dose and continuing with the next scheduled dose. It is advised not to double the dose to make up for the one that was missed.


Q: What happens if I take an extra dose of Codterpin by mistake?

Regulatory information cautions that seeking immediate medical attention is necessary if an overdose is suspected or if more than the recommended amount is taken, due to the risk of serious or life-threatening breathing problems.


Q: Can Codterpin be taken with alcohol?

Official drug information states that using alcohol may increase the risk of serious central nervous system side effects, including severe drowsiness, poor concentration, and dangerous breathing suppression.


Q: Is the onset time faster when Codterpin is taken on an empty stomach?

Official studies report that most foods do not significantly affect the absorption or time to peak concentration of the codeine component. Therefore, taking it with or without food is not reported to substantially change the time it takes for the codeine component to be fully absorbed.


Q: What is the meaning of the word 'terpin' in the drug name?

The medicine contains 'terpinhydrate,' which is classified in official sources as the expectorant substance. This component is included to help make respiratory secretions more liquid, facilitating their clearance from the airways.


Q: Is Codterpin a narcotic, or is it non-narcotic?

The codeine component of the medicine is officially classified in regulatory documents as an opioid analgesic. This classification is the technical term for what is sometimes broadly referred to as a narcotic.


Q: How does the mechanism of Codterpin compare to older classes of medicine for the same purpose?

The codeine component's action as a cough suppressant that affects the cough center in the brainstem is well-established. It is often used in scientific practice as a standard against which the efficacy of many newer cough medications is measured in clinical studies.


Q: What is the main difference between Codterpin and over-the-counter alternatives?

Codterpin contains codeine, which is classified as an opioid analgesic and a controlled substance, meaning it requires a prescription from a healthcare professional. In contrast, most common non-prescription cough remedies available over-the-counter do not contain opioid ingredients.


Q: Is Codterpin used for chronic conditions, or just short-term use?

Regulatory restrictions emphasize that the codeine component should be used for the shortest possible duration. Official information explicitly limits its use for acute pain in some jurisdictions to no more than three days.


Q: Can Codterpin be split in half, or must it be swallowed whole?

If a tablet is approved to be split, this information is explicitly stated in the regulatory labeling and the tablet would be scored (have a line). Unless official product information explicitly states that a tablet can be split, it is generally intended to be swallowed whole.


Q: How long does Codterpin stay in the body after the last use?

Pharmacokinetic data reports that the half-life of codeine and its active metabolites is approximately three hours. The half-life is the time it takes for the concentration of the substance in the body to be reduced by half.


Q: Is Codterpin safe to use if I have kidney issues?

Official protocols indicate that the dosage must be reduced if a patient has severe impairment of their kidney function. This is a safety measure to adhere to regulatory protocols.


Q: Can Codterpin cause difficulty sleeping?

While the medicine is commonly associated with drowsiness and sedation, regulatory safety information also notes that the codeine component may cause insomnia, which is difficulty falling or staying asleep, particularly with long-term use.


Q: Does Codterpin have any withdrawal symptoms if stopped suddenly?

Regulatory documents indicate that because the medicine is associated with a risk of physical dependence with prolonged use, suddenly stopping or significantly reducing the dose is associated with the potential for withdrawal symptoms.


Q: What are the clinical trial findings related to Codterpin's side effect profile?

Official regulatory documents list the most common adverse reactions, such as drowsiness, nausea, and vomiting, based on data collected from studies. These studies, including clinical trials, are used by health authorities to establish the drug’s formal safety profile.


Q: What regulatory bodies have approved Codterpin for use?

The medicine has been approved for use by national government health authorities in various countries. Examples include the Food and Drug Administration (FDA) in the United States and the European Medicines Agency (EMA) in Europe, which ensures the drug meets standards for safety and efficacy.


Q: Is there a link between Codterpin and vision changes?

Regulatory documentation for the codeine component notes that it has the potential to cause changes in vision. These changes may include instances of blurred or double vision.


Q: Is Codterpin a common cause of dry mouth?

Official safety information classifies dry mouth as an uncommon adverse reaction associated with this medicine. This means it is observed less frequently than the most common side effects, which include nausea, vomiting, and dizziness.


Q: Are there long-term side effects that are unique to Codterpin?

Official regulatory labeling focuses on specific risks associated with prolonged use of the codeine component. These long-term considerations include the development of physical dependence, tolerance requiring higher doses, and severe constipation.


Q: Can Codterpin be crushed and mixed with water or food?

Official patient guidance typically advises against crushing the tablet. This is a common precaution for many medicines, and it is usually noted in the official patient information.

How should Codterpin be stored and disposed of?

How to Store and Dispose of Codterpin

Codterpin must be stored and handled according to specific regulatory requirements, particularly due to the presence of the controlled substance codeine.

Storage Requirements

Condition Regulatory Mandate
Temperature Do not store above 25 C to maintain its mathbf36-month shelf-life.
Packaging Store only in the original container.
Security Keep out of the sight and reach of children.

Disposal Instructions

Disposal of unused or expired Codterpin is governed by strict protocols for controlled medicines. The quantity and date of disposal must be recorded in an official register and formally acknowledged by a Drug Enforcement Officer. This procedure supersedes general household disposal methods.

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

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