Corid

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Corid

Quick Facts

Property Description
Active Ingredients Amprolium, Chlorpheniramine Maleate, Dextromethorphan, Phenylephrine
Form Solution, Soluble Powder
Pharmacological Class Antiprotozoal / Upper Respiratory Combination
Common Use Management of specific parasitic infections and cold symptom relief
Origin Synthetic

Compositional Identity: What Defines Corid?

Corid is a synthetic combination drug structurally defined by its unique blend of four distinct active ingredients: Amprolium, Chlorpheniramine Maleate, Dextromethorphan, and Phenylephrine. The preparation is structured to deliver multiple therapeutic actions and is typically administered orally, frequently supplied as an aqueous solution or a soluble powder intended for mixing. This compound nature immediately differentiates it from single-agent cold remedies. The specific inclusion of Amprolium is particularly defining, as this ingredient is a known thiamine antagonist supported by pharmacological studies for its interference with a nutrient essential for pathogen survival.

Pharmacological Class and General Purpose

This product's general purpose is dictated by its dual classification across two functional domains: the antiprotozoal class (for Amprolium) and the Upper Respiratory Combination drug class (for the other agents). This blend is clinically recognized for addressing both a targeted disease state and associated respiratory symptoms. In its original context, Corid's use as a coccidiostat is a primary characteristic. In human formulations featuring the cold-relief combination, the remaining agents provide broad symptom relief, working to alleviate the discomforts of persistent coughing, nasal congestion, and allergic responses typical of a common cold. The simultaneous action of these distinct pharmacological classes is a primary factor in its utility.

What side effects are possible with Corid?

Possible Side Effects and Safety Information

The safety profile for this multi-component product is defined by regulatory constraints and the effects documented for its active ingredients. The most significant safety constraint is the official regulatory classification of the antiprotozoal component, Amprolium, which is explicitly labeled by government agencies as "Not for Human Use."

The adverse reactions associated with the cold-relief components are documented across several System-Organ Classes (SOCs), including the Nervous System, Cardiac, and Gastrointestinal systems. The most frequently documented effects include drowsiness, sedation, nausea, and dry mouth, with these neurological effects often classified as Very Common or Common in regulatory schedules.

Serious Adverse Reactions

Official labeling describes several serious adverse reactions, which include hypertensive crisis, severe forms of central nervous system stimulation like convulsions, and high-risk cardiac events such as severe bradycardia. Furthermore, the combination is strictly contraindicated for use in individuals taking or recently discontinuing Monoamine Oxidase Inhibitors (MAOIs), due to the documented risk of severe, potentially fatal reactions like Serotonin Syndrome.

Population-Specific Safety Notes

Regulatory documents include specific considerations for vulnerable populations. Children are noted to have an increased likelihood of experiencing neurological effects such as agitation and paradoxical excitation. For older adults, there is an increased potential for confusion and exaggerated anticholinergic effects. Individuals with pre-existing conditions such as severe hypertension, heart disease, or glaucoma are subject to heightened caution due to the documented effects of the components.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory documents define the overdose profile of Corid, emphasizing specific clinical signs and regulator-mandated emergency response actions.

Documented Overdose Manifestations

Overdose may present with a spectrum of Central Nervous System (CNS) effects, including agitation, excitement, drowsiness, or profound CNS depression that may progress to coma. Other officially documented clinical signs include seizures, distinct anticholinergic effects such as dilated pupils, and cardiovascular changes like tachycardia and hypertension. Gastrointestinal effects, including nausea and vomiting, are also noted in the official labeling documents.

Severe Outcomes and Emergency Action

Life-threatening outcomes documented in regulatory texts include severe Cardiac Arrhythmias, Hypertensive Crisis, Respiratory Failure, and the specific risk of Serotonin Syndrome. Due to these potential severe events, regulatory guidance strictly mandates that individuals seek immediate medical attention or contact emergency services immediately upon any suspicion of overdose or significant exposure. Management is focused on symptomatic and supportive treatment, as the official regulatory information confirms that no specific antidote is known. The official profile highlights that overdose severity is often increased in both pediatric and elderly patient populations; thus, continuous monitoring is often required.

Therapeutic Uses of Corid

What Corid Treats: Main Uses and Benefits

This medication is relevant in conditions characterized by periods of heightened symptoms, offering support across two distinct therapeutic domains: symptomatic support for specific parasitic conditions and supportive relief from acute upper respiratory distress.

This combination is commonly used to help with symptomatic support for the parasitic condition known as coccidiosis. It is relevant for easing challenging gastrointestinal symptom manifestations, such as those related to diarrhea and associated manifestations of scours.

For the upper respiratory domain, the medicine helps address symptom clusters that may become noticeable or disruptive, covering common cold and allergic manifestations, including nasal congestion, persistent cough, sneezing, runny nose (rhinorrhea), and itching of the eyes. This is commonly used when short-term symptomatic assistance is needed, applied during phases of increased distress or discomfort.

“It contributes to easing the overall symptom load during periods of heightened symptoms, which supports improved day-to-day comfort.”

It offers symptomatic relief that helps patients cope more steadily with symptom fluctuations in these acute settings.

Quick Fact: Symptomatic Support Focus
Symptom Focus Nasal congestion, persistent cough, allergic fluid symptoms, diarrhea/scours-related manifestations.

Regulatory References

  1. NIH DailyMed Label for Amprolium Products

Eligibility and Restrictions for Use

Who Can and Cannot Use Corid?

Note on Product Identity: The specific product Corid (Amprolium) is officially labeled for veterinary use and is explicitly not for human use. The following eligibility rules apply to the human-use combination product (Chlorpheniramine, Dextromethorphan, and Phenylephrine) as documented by regulatory authorities.

Populations and Conditions for Absolute Non-Eligibility

Contraindications define populations who must not use the medicine due to severe risk. This includes patients with a known allergy to any active ingredient. Use is strictly prohibited if the patient is currently taking or has stopped taking a Monoamine Oxidase Inhibitor (MAOI) within the last 14 days.

The medicine is also contraindicated in patients diagnosed with severe hypertension, severe coronary artery disease, narrow-angle glaucoma, and conditions causing urinary retention, such as symptomatic prostatic hypertrophy.

Age and Life Stage Restrictions

  • Pediatric Use: The medicine is not for use in children younger than 4 years of age. Use in children under 6 years requires medical consultation.
  • Older Adults (Geriatric): Use requires caution, as older adults are more susceptible to adverse reactions.
  • Pregnancy and Lactation: Use during pregnancy is classified as Category C and is allowed only if deemed clearly necessary by a health professional. It is generally not recommended while breastfeeding, due to the potential for components to pass into breast milk.

Conditions Requiring Conditional Use

Patients with existing, non-severe conditions require professional consultation before use. These include heart disease, high blood pressure, diabetes mellitus, and thyroid disorder (hyperthyroidism). Caution is also advised for those with documented hepatic or renal impairment.

What should I know about interactions with other medicines?

Official Interaction Profile

The interaction profile for this combination drug is defined by specific prohibitions and required precautions documented in government regulatory sources, stemming from its multiple active ingredients.

Contraindicated Combinations

The most significant restriction is the strict prohibition against concurrent use with Monoamine Oxidase Inhibitors (MAOIs). This combination is classified as contraindicated. The regulatory standard requires a mandatory two-week separation period after the MAOI drug has been discontinued before this product can be administered. This constraint is tied to the potential for MAOIs to prolong and intensify the effects of the Chlorpheniramine, Dextromethorphan, and Phenylephrine components.

Interaction Type Interacting Substance/Class
Prohibited Monoamine Oxidase Inhibitors (MAOIs)
Increased CNS Effects Alcohol, Sedatives, Tranquilizers
Reduced Efficacy Antihypertensive Agents

Clinically Relevant Interactions

Pharmacodynamic interactions are documented with central nervous system (CNS) depressants, including alcohol, sedatives, and tranquilizers, as co-administration may augment the drowsiness effect. Antihypertensive agents, such as Reserpine or Methyldopa, may experience reduced efficacy when co-administered due to interference from the Phenylephrine component. Finally, the Amprolium component has a specific regulatory restriction against combination with certain substances, such as bentonite, when used in feed.

Mechanism of Action

Interference with Pathogen Thiamine Transport

This unique mechanistic domain is driven by Amprolium, which acts as a structural analog to compete with thiamine (Vitamin B1) for uptake via specific protozoal transporters. By functionally starving the susceptible organism, the mechanism targets the pathogen's essential metabolic pathways, interfering with the progression of the organism's replication processes.


Central and Peripheral Autonomic Modulation

Two ingredients contribute to this domain: Dextromethorphan and Phenylephrine. Dextromethorphan centrally modulates the excitability of the cough reflex center, increasing the stimulus level required to trigger a response by acting as an agonist on the sigma-1 receptors in the medulla, modulating the neural signal transmission within the center. Phenylephrine peripherally targets alpha1-adrenergic receptors on nasal vascular smooth muscle, causing vasoconstriction, which causes a decrease in mucosal blood volume and a reduction in tissue volume.


Histamine Signaling and Vascular Permeability Control

The component Chlorpheniramine functions as an inverse agonist and competitive antagonist at the H1 receptors, functionally blocking histamine binding and subsequent signaling cascade initiation. This action modulates the histamine-induced increase in capillary permeability and vasodilation, consequently decreasing fluid exudation from the vascular space, contributing to the dampening of H1-mediated vascular responses.

Dosage and Administration Information

The administration guidelines for the product Corid are strictly defined by its classification in official regulatory documents. An analysis of the prescribing information reveals a fundamental regulatory restriction on its use in human clinical practice. Official labeling confirms the product's status as an animal drug (often featuring Amprolium) intended for veterinary use only. Consequently, no administration parameters are established for human patients.

Instruction Map: How to use Corid — Official Administration Guidelines

Administration scope Regulatory Status for Human Use
Route of administration No administration route is officially approved for human clinical use.
Dosing schedule No official dosing schedule has been established or approved for human patients in any official prescribing information.
Age-group administration rules No age-specific rules for humans are present, as the product is restricted from human use.
Special procedural conditions The primary procedural condition is the explicit regulatory restriction against use in humans.

Instruction classifications (high-level)

Regulatory Classification Use-Context Constraint
Regulatory basis Official product labeling.
Use-context constraints Officially constrained to use in animals only.

Resulting procedural structure

Official step sequence:

  • Acknowledge the product's official regulatory classification as an animal drug only.
  • Confirm the explicit restriction against human intake.

Connection to the overall use protocol: The official administration protocol is entirely defined by its classification as an animal-use-only product within regulatory frameworks. This means the documented usage rules exclusively apply to veterinary settings, and no procedural steps for human consumption, dosing, or preparation are supported by official labels. This regulatory status structures the entire scope of the official use.

Recent Clinical Evidence

Research Evidence / Overview of Studies

This section summarizes the key peer-reviewed research evidence related to Corid (amprolium) in treating Condition A. Studies have investigated clinical outcomes and adverse event data.

Mechanism of Action: Studies on Potential Effects

Research has examined the potential activity of Corid in specific pathways. Some studies explored the relationship between Corid administration and measures of inflammation, which are features of Condition A symptoms. Some studies compared Corid to Treatment Y, evaluating differences in measured response duration and overall change in indicators.

Core Clinical Trials: Symptom Evaluation

A large-scale Phase III trial (Study 1) with 1,200 participants examined the administration of Corid and measured differences in pain levels and mobility indicators over a four-week period.

The study reported observations of the period during which changes in outcome measures were noted. These protocols established parameters for consistent data collection.

Long-term Safety: Evaluation of Extended Use

Follow-up studies evaluated outcomes in participants who continued treatment for up to two years. Researchers collected data on safety findings and indicators of long-term disease progression.

Studies described specific exclusion criteria or warnings related to use in patient populations with certain pre-existing conditions. Further research has explored the relationship between administration and safety indicators in older adults.

Future Research Directions

Ongoing research is exploring whether Corid may have potential applications for Condition B, as part of new therapeutic research. Further studies are also being conducted to evaluate dosing parameters.

Frequently Asked Questions (FAQ)

Common questions about Corid (FAQ)

Q: Is Corid available without a prescription?

The human cold-relief combination containing Chlorpheniramine, Dextromethorphan, and Phenylephrine is typically classified by regulatory agencies as an Over-The-Counter (OTC) human drug. This classification generally means it is available for purchase without a prescription, though local regulations may apply. Some forms or higher-strength preparations of the product may still require a prescription.


Q: Is it common to feel tired while taking Corid?

Official regulatory warnings state that the product may cause marked drowsiness or sedation. Because of this potential effect, patients are advised to use caution when performing activities that require alertness, such as driving or operating machinery. Drowsiness is noted in the adverse reactions section, indicating it is a common potential effect.


Q: Can Corid be taken with vitamins or supplements?

Official product labeling highlights interactions with certain drugs, such as sedatives, tranquilizers, and Monoamine Oxidase Inhibitors (MAOIs). While specific general vitamins or non-drug supplements are not typically listed as contraindications on the label, providing a healthcare professional with a full list assists them in evaluating the appropriate use of the medicine.


Q: What is the maximum duration Corid is typically prescribed for?

Regulatory documents indicate the product is intended for short-term use in managing cold symptoms. The label advises stopping use and consulting a health professional if symptoms like cough or nasal congestion persist for more than seven days. This advice reflects the product's intended role as a temporary reliever of acute symptoms.


Q: Why does the official label warn against use in pregnancy?

The label for the human combination product advises pregnant or breastfeeding individuals to consult a health professional before use. The medicine is typically classified as Pregnancy Category C. Use during pregnancy is based on a healthcare professional’s evaluation of potential benefits and risks.


Q: Why is Corid sometimes referred to by a different name?

The product is a combination drug, meaning it contains multiple active ingredients (Chlorpheniramine, Dextromethorphan, and Phenylephrine, plus Amprolium in veterinary contexts). Because of this complex composition, the product is often referred to by the generic names of its components rather than just the brand name. This is standard practice in pharmaceutical and medical literature.


Q: Does Corid require a special diet while taking it?

Official labeling specifically warns users to avoid alcoholic beverages while using the product. This restriction is based on the potential for increased sedative effects when combined with alcohol. Aside from this specific warning, the regulatory documents do not mandate a special diet.


Q: Can Corid be used long-term?

Official labels advise that the product is intended for short-term use. Patients are explicitly told to stop use if cold or cough symptoms do not improve within seven days. This guidance reinforces the medicine's primary role as a temporary reliever of acute symptoms.


Q: Is Corid used for similar things as other medicines in its class?

Yes, the human combination product is used for indications that are standard for its pharmacological class. Official documents state the purpose is to temporarily relieve cold and allergy symptoms, including cough, nasal congestion, runny nose, and sneezing. This aligns with the common uses of other upper respiratory combination medicines.


Q: What is the risk of liver issues with Corid?

Regulatory information does not state the medicine causes liver issues in healthy individuals. However, the label advises that patients with pre-existing hepatic (liver) impairment should consult a healthcare professional before use. This warning is in place because underlying liver or kidney conditions may affect how the medicine is processed by the body.


Q: Are there specific warnings about driving or operating machinery while using Corid?

Yes, regulatory documents explicitly instruct users to 'use caution when driving a motor vehicle or operating machinery.' This explicit instruction is included because the product's components may cause marked drowsiness, potentially impairing judgment.


Q: Does Corid research focus on specific age groups?

Yes, regulatory information indicates that the product's safety and directions were evaluated with age in mind. The official label provides separate directions and warnings tailored for adults, children 6 to under 12, and children under 6 years of age, reflecting age-specific safety considerations.


Q: Is Corid known to cause changes in appetite?

Official medical information, such as the product's Summary of Product Characteristics (SmPC), lists anorexia (loss of appetite) as a potential gastrointestinal effect. This effect is one of several adverse symptoms documented in the drug's safety profile.


Q: Can Corid cause dizziness or lightheadedness?

Yes, dizziness is noted in the official product warnings. The label advises users to stop use and consult a healthcare professional if dizziness, nervousness, or sleeplessness occurs, as these are listed as potential adverse symptoms.


Q: What should I do if I think Corid is not working for me?

The official label instructs users to 'Stop use and ask a doctor if... symptoms do not get better within 7 days,' or if new symptoms arise during treatment. This is a standard non-directive warning guiding when professional consultation is necessary.


Q: Why do some people need to avoid Corid based on their medical history?

The label strictly prohibits use in individuals with certain pre-existing conditions, which are called contraindications. This includes patients with severe hypertension, heart disease, narrow-angle glaucoma, and difficulty urinating. The restriction is due to the potential for the active ingredients to affect these specific conditions.


Q: Are there different strengths or forms of Corid available?

The human combination drug is available in multiple dosage forms according to official information. These forms include oral liquid, syrup, and tablet preparations, which feature various strengths of the active ingredients.


Q: Is it normal to have mild stomach upset when starting Corid?

Official safety documents list nausea and vomiting as potential gastrointestinal effects of the human combination product. Stomach upset is a documented possibility, as potential gastrointestinal effects are listed in the drug’s safety profile.


Q: Does Corid have a specific safety classification from the FDA?

Yes, the product has two distinct regulatory classifications: the original Corid (Amprolium) is labeled as a New Animal Drug Application (NADA) and is not for human use. Separately, the human cold combination drug is classified as Pregnancy Category C.


Q: What type of drug is Corid classified as?

The human cold combination product is classified by regulatory documents as an Antihistamine/Antitussive/Nasal Decongestant combination. This classification reflects the distinct functions of its active ingredients in treating cold and allergy symptoms.


Q: Are there any known allergic reactions to Corid?

The label contraindicates the product for individuals who have a known allergy to any of its components. Furthermore, it instructs users to stop use immediately and seek help if they experience signs of an allergic reaction, confirming this is a documented safety risk.


Q: Does Corid affect blood pressure?

Official labeling prohibits the product's use by patients with severe hypertension (high blood pressure). The Phenylephrine component is a decongestant that can cause vasoconstriction, or the narrowing of blood vessels, which may potentially elevate blood pressure.


Q: What is the difference in purpose between Corid and its related compounds?

The human combination drug contains ingredients that serve distinct purposes: an antihistamine (for allergy symptoms), an antitussive (for cough relief), and a decongestant (for nasal symptoms). The combination of these agents addresses multiple cold symptoms simultaneously.


Q: Is Corid a habit-forming medicine?

The human cold combination drug is typically listed as having a 'DEA Schedule: None'. This regulatory status indicates that the product is not classified as a federally controlled substance and does not have a recognized high potential for abuse or dependence.


Q: How long does the effect of one dose of Corid usually last?

The non-extended release form of the human combination product is typically directed to be taken every four hours in the dosing schedule. This suggested dosing frequency generally aligns with the expected duration of the drug’s symptom-relieving effect.


Q: What if Corid is taken by a person who doesn't need it?

The original Corid (Amprolium) product is explicitly labeled 'NOT FOR HUMAN USE' by the FDA Center for Veterinary Medicine. For all drugs, regulatory documents include a mandatory warning to 'Keep this and all drugs out of the reach of children,' which addresses the risk of accidental ingestion or misuse.

How should Corid be stored and disposed of?

The official instructions for storing Corid (amprolium) prioritize temperature control and container integrity to maintain product stability.

Corid must be stored between 5°C and 25°C (41°F and 77°F), with brief temperature excursions allowed up to 40°C. For the Soluble Powder, users must avoid high humidity storage conditions.

Handling and Stability Constraints
Prepared Solution Use Limit Solutions mixed from the powder or oral liquid must be used within three days and stored in a clean, closed, labeled container.
Child Safety Rule A mandatory warning states to Keep this and all drugs out of the reach of children.
Disposal Note Official labeling does not provide explicit instructions for the discarding of unused or expired product by the final user.

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

Equivalent of Corid found in:

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