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Mucus Dm

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Active ingredients
  • Guaifenesin 400 mg/20 mL
  • Dextromethorphan Hydrobromide 20 mg/20 mL
Other brand names
Drug classes
Expectorant, Sigma-1 Agonist, Uncompetitive N-methyl-D-aspartate Receptor Antagonist
Dosage form
Liquid
Route
Oral
Prescription status
OTC (over the counter)
Marketed in the U.S.
Since 2019
Label revision date
November 20, 2025
Active ingredients
  • Guaifenesin 400 mg/20 mL
  • Dextromethorphan Hydrobromide 20 mg/20 mL
Other brand names
Drug classes
Expectorant, Sigma-1 Agonist, Uncompetitive N-methyl-D-aspartate Receptor Antagonist
Dosage form
Liquid
Route
Oral
Prescription status
OTC (over the counter)
CSA schedule
Not a scheduled drug
Marketed in the U.S.
Since 2019
Label revision date
November 20, 2025
Manufacturer
Rite Aid Corporation
Registration number
M012
NDC root
11822-5050

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If you are a consumer or patient please visit this version.

Drug Overview

This product is a maximum strength mucus relief medication designed to help you manage cough and chest congestion. It contains dextromethorphan HBr (a cough suppressant) and guaifenesin (an expectorant), which work together to control coughing and relieve chest congestion. Dextromethorphan helps reduce the urge to cough, making it easier for you to sleep, while guaifenesin thins and loosens mucus, making your coughs more productive.

This medication is suitable for individuals aged 12 and older and is effective for temporary relief of cough caused by minor throat and bronchial irritation, such as that which may occur with the common cold or from inhaled irritants. It is designed for 4-hour dosing to provide ongoing support as needed.

Uses

This medication is designed to help you breathe easier by loosening phlegm (mucus) and thinning bronchial secretions, making your coughs more productive. If you're dealing with a cough caused by minor throat and bronchial irritation, such as from a common cold or inhaled irritants, this medication can provide temporary relief.

In addition to easing your cough, it can also reduce the intensity of your coughing fits and help suppress the urge to cough, which can be particularly helpful when you're trying to get a good night's sleep.

Dosage and Administration

When using this medication, it's important to follow the dosing instructions carefully to ensure your safety and effectiveness. For adults and children aged 12 years and older, the recommended dose is 20 milliliters (mL) every 4 hours. However, you should not take more than 6 doses within a 24-hour period.

Make sure to measure the dose using the dosing cup that comes with the product, as this ensures accuracy. Avoid using any other measuring devices, as they may not provide the correct amount. Keep the dosing cup with the product to make it easy to measure your doses each time. If you have children under 12 years of age, do not use this medication for them without consulting a doctor.

What to Avoid

You should avoid using this product if you are currently taking a prescription monoamine oxidase inhibitor (MAOI), which is a type of medication used for depression, psychiatric or emotional conditions, or Parkinson’s disease. Additionally, do not use this product for at least two weeks after stopping an MAOI. If you're unsure whether your prescription includes an MAOI, please consult your doctor or pharmacist.

It's also important to follow the recommended dosage carefully. Do not exceed the directed amount when using this product, as misuse can lead to serious health issues. Always prioritize your safety and well-being by adhering to these guidelines.

Side Effects

You should be aware of some important side effects and warnings associated with this medication. It is crucial not to use it if you are currently taking a monoamine oxidase inhibitor (MAOI), which is a type of medication used for depression or certain other conditions, or if you have stopped taking an MAOI within the last two weeks.

If your cough lasts more than seven days, returns, or is accompanied by fever, rash, or a persistent headache, you should stop using the medication and consult a doctor, as these symptoms may indicate a more serious health issue. Additionally, consult your doctor before using this medication if you have a chronic cough due to smoking, asthma, chronic bronchitis, or emphysema, or if your cough produces excessive mucus.

Warnings and Precautions

You should not use this product if you are currently taking a prescription monoamine oxidase inhibitor (MAOI), which is a type of medication used for depression or certain other conditions, or if you have stopped taking an MAOI within the last two weeks. If you're unsure whether your medication contains an MAOI, please consult your doctor or pharmacist before using this product.

Before using this product, it's important to talk to your doctor if you have a persistent cough due to smoking, asthma, chronic bronchitis, or emphysema, or if your cough is accompanied by excessive mucus. Always follow the dosage instructions carefully and do not exceed the recommended amount. If your cough lasts more than 7 days, returns, or is accompanied by fever, rash, or a persistent headache, stop using the product and contact your doctor, as these may be signs of a more serious condition. In case of an overdose, seek medical help immediately or call the Poison Control Center at 1-800-222-1222.

Overdose

If you suspect an overdose, it’s crucial to seek medical help immediately. You can contact a Poison Control Center at 1-800-222-1222 for guidance. Signs of an overdose can vary, but they may include unusual drowsiness, confusion, or difficulty breathing.

Always err on the side of caution—if you notice any concerning symptoms or if you’re unsure, don’t hesitate to get help right away. Your health and safety are the top priority.

Pregnancy Use

If you are pregnant or breastfeeding, it’s important to consult with a healthcare professional before using this medication. They can provide guidance on whether it’s safe for you and your baby. Always prioritize your health and the health of your child by seeking expert advice.

Lactation Use

If you are pregnant or breastfeeding, it’s important to consult with a healthcare professional before using any medication. This ensures that you understand any potential risks and can make informed decisions about your health and the health of your baby. Always prioritize open communication with your doctor regarding your breastfeeding journey.

Pediatric Use

It's important to be cautious when using this medication for children. If your child is under 12 years old, you should not use this product. For those aged 12 and older, the recommended dosage is 20 mL every 4 hours. Always keep the medication out of reach of younger children to prevent accidental ingestion.

In the event of an overdose, it's crucial to seek medical assistance immediately or contact a Poison Control Center at 1-800-222-1222. Your child's safety is the top priority, so please follow these guidelines carefully.

Geriatric Use

While there is no specific information about how this medication should be used by older adults, it’s important to approach any new treatment with caution. Since older adults may have different health needs and may be taking multiple medications, it’s always a good idea to discuss any new prescriptions with your healthcare provider. They can help ensure that the medication is safe and appropriate for you or your loved one, considering any existing health conditions or medications.

If you are caring for an older adult, be attentive to any changes in their health or behavior after starting a new medication. Regular check-ins with a healthcare professional can help manage any potential risks and ensure the best outcomes.

Renal Impairment

If you have kidney problems, it's important to know that the drug insert does not provide specific information about dosage adjustments, special monitoring, or safety considerations for your condition. This means that there are no tailored guidelines for how this medication may affect you if you have renal impairment (kidney issues).

Always consult your healthcare provider for personalized advice and to ensure that any medication you take is safe and appropriate for your health situation. They can help monitor your kidney function and make any necessary adjustments to your treatment plan.

Hepatic Impairment

If you have liver problems, it's important to know that the drug insert does not provide specific information about dosage adjustments, special monitoring, or precautions for your condition. This means that there are no tailored guidelines for how this medication may affect you if you have hepatic impairment (liver issues).

Before starting any new medication, including this one, you should discuss your liver health with your healthcare provider. They can help determine the best approach for your treatment and ensure your safety.

Drug Interactions

It's crucial to talk to your healthcare provider about any medications you are currently taking, especially if you are on a prescription monoamine oxidase inhibitor (MAOI). Using this medication while taking an MAOI or within two weeks of stopping it can lead to serious interactions that may affect your health.

Always keep your healthcare team informed about all the drugs you are using to ensure your safety and the effectiveness of your treatment. This open communication helps prevent potential complications and ensures you receive the best care possible.

Storage and Handling

To ensure the best performance of your product, store it at room temperature, specifically between 20-25°C (68-77°F). It's important not to refrigerate the product, as this could affect its effectiveness.

When handling the product, make sure to do so in a clean environment to maintain its integrity. Always follow any additional safety instructions provided to ensure safe and effective use.

Additional Information

No further information is available.

FAQ

What is the main purpose of this medication?

This medication provides maximum strength mucus relief, controlling cough and relieving chest congestion by thinning and loosening mucus.

What are the active ingredients in this medication?

It contains dextromethorphan HBr 20 mg, a cough suppressant, and guaifenesin 400 mg, an expectorant.

Who can use this medication?

This medication is intended for adults and children aged 12 years and older. Children under 12 years of age should not use it.

How should I take this medication?

You should take 20 mL every 4 hours, but do not exceed 6 doses in any 24-hour period. Use the dosing cup provided.

What should I do if my cough lasts more than 7 days?

You should stop using the medication and ask a doctor if your cough lasts more than 7 days, comes back, or occurs with fever, rash, or persistent headache.

Are there any warnings associated with this medication?

Do not use this medication if you are currently taking a prescription monoamine oxidase inhibitor (MAOI) or for 2 weeks after stopping an MAOI.

What should I do in case of an overdose?

In case of overdose, seek medical help or contact a Poison Control Center immediately at 1-800-222-1222.

Can I use this medication if I am pregnant or breastfeeding?

If you are pregnant or breastfeeding, you should ask a health professional before using this medication.

How should I store this medication?

Store the medication between 20-25°C (68-77°F) and do not refrigerate.

Packaging Info

Below are the non-prescription pack sizes of Mucus Dm (dextromethorphan hydrobromide guaifenesin). Columns show Packaging, Formulation Type, and Active Ingredient Strength.

Packaging configurations for Mucus Dm.
Details

Drug Information (PDF)

This file contains official product information for Mucus Dm, including active ingredients, dosage, warnings, and labeling as submitted by the manufacturer for OTC distribution.

View product document (PDF)

Description

No description information is available for the drug.

Uses and Indications

This drug is indicated for the relief of cough associated with minor throat and bronchial irritation, which may occur due to the common cold or inhaled irritants. It helps to loosen phlegm (mucus) and thin bronchial secretions, thereby making coughs more productive.

Additionally, this drug temporarily relieves the intensity of coughing and reduces the impulse to cough, facilitating improved sleep quality.

Limitations of use include the absence of teratogenic or nonteratogenic effects as per the available data.

Dosage and Administration

The maximum recommended dosage is 6 doses within a 24-hour period. It is imperative that the dosing cup provided with the product is used for measurement; no other devices should be utilized to ensure accurate dosing. The dosing cup should be kept with the product at all times.

For adults and children aged 12 years and older, the recommended dose is 20 mL every 4 hours, as needed. For children under 12 years of age, the use of this product is not recommended. Healthcare professionals should advise patients to follow these guidelines or any specific instructions provided by their physician.

Contraindications

Use of this product is contraindicated in patients currently taking a prescription monoamine oxidase inhibitor (MAOI) or within 2 weeks of discontinuing an MAOI. MAOIs are commonly prescribed for depression, psychiatric or emotional conditions, and Parkinson’s disease. Patients should consult a healthcare professional if uncertain whether their prescription includes an MAOI.

Additionally, exceeding the recommended dosage is contraindicated. Adherence to the directed dosage is essential to avoid potential adverse effects.

Warnings and Precautions

The use of this product is contraindicated in individuals currently taking a prescription monoamine oxidase inhibitor (MAOI), which includes certain medications prescribed for depression, psychiatric or emotional conditions, or Parkinson’s disease. Additionally, it should not be used for a period of two weeks following the discontinuation of an MAOI. Healthcare professionals should advise patients to consult with a doctor or pharmacist if there is uncertainty regarding the presence of an MAOI in their prescription medications.

Prior to using this product, it is essential for patients to seek medical advice if they have a persistent or chronic cough, particularly if it is associated with smoking, asthma, chronic bronchitis, or emphysema. Furthermore, patients should consult a healthcare provider if their cough is accompanied by excessive phlegm (mucus).

While using this product, it is critical that patients adhere strictly to the recommended dosage and not exceed the directed amount.

Patients should discontinue use and consult a healthcare professional if their cough persists for more than seven days, recurs, or is accompanied by symptoms such as fever, rash, or a persistent headache, as these may indicate a serious underlying condition.

In the event of an overdose, immediate medical assistance should be sought, or the Poison Control Center (1-800-222-1222) should be contacted without delay.

Side Effects

Patients should be aware of the potential adverse reactions associated with the use of this medication. Serious adverse reactions may occur, particularly in patients who are currently taking or have recently discontinued a prescription monoamine oxidase inhibitor (MAOI). It is contraindicated to use this medication in conjunction with MAOIs or within two weeks of stopping such treatment, as this may lead to significant health risks.

Common adverse reactions include the need to discontinue use and consult a healthcare provider if a cough persists for more than seven days, recurs, or is accompanied by fever, rash, or a persistent headache. These symptoms may indicate a serious underlying condition that requires medical attention.

Additionally, patients should seek medical advice prior to using this medication if they have a persistent or chronic cough, such as that associated with smoking, asthma, chronic bronchitis, or emphysema. Coughs accompanied by excessive phlegm (mucus) also warrant consultation with a healthcare professional before use.

Drug Interactions

The concomitant use of this medication with prescription monoamine oxidase inhibitors (MAOIs) is contraindicated. Patients should not take this medication while on MAOIs or for a period of two weeks following the discontinuation of MAOI therapy. The combination may result in serious interactions that could pose significant health risks. It is essential for healthcare providers to ensure that patients are not concurrently using MAOIs before initiating treatment with this medication.

Packaging & NDC

Below are the non-prescription pack sizes of Mucus Dm (dextromethorphan hydrobromide guaifenesin). Columns show Packaging, Formulation Type, and Active Ingredient Strength.

Packaging configurations for Mucus Dm.
Details

Pediatric Use

Children under 12 years of age should not use this medication. For adults and pediatric patients aged 12 years and older, the recommended dosage is 20 mL every 4 hours.

It is essential to keep this medication out of reach of children. In the event of an overdose, immediate medical assistance should be sought, or contact a Poison Control Center at 1-800-222-1222.

Geriatric Use

There is no specific information regarding the use of this medication in geriatric patients, including dosage adjustments, safety concerns, or special precautions. Healthcare providers should exercise caution when prescribing this medication to elderly patients, as individual responses may vary. Monitoring for potential adverse effects and therapeutic efficacy is recommended in this population.

Pregnancy

Pregnant patients and those who are breastfeeding should consult a healthcare professional prior to using this medication. It is important to assess the potential risks and benefits associated with the use of this drug during pregnancy and lactation. Healthcare providers can offer guidance based on individual circumstances and the latest clinical data.

Lactation

Lactating mothers are advised to consult a health professional prior to using this medication. There is no specific data available regarding the excretion of this medication in breast milk or its effects on breastfed infants. Therefore, caution is recommended when administering this medication to lactating individuals.

Renal Impairment

Patients with renal impairment have not been specifically addressed in the drug insert text regarding dosage adjustments, special monitoring, or safety considerations. Therefore, healthcare professionals should exercise caution when prescribing this medication to individuals with reduced kidney function, as the absence of detailed guidance necessitates careful clinical judgment and monitoring of these patients.

Hepatic Impairment

Patients with hepatic impairment have not been specifically studied in relation to this medication. Consequently, there are no established dosage adjustments, special monitoring requirements, or precautions outlined for individuals with compromised liver function. It is recommended that healthcare providers exercise caution when prescribing this medication to patients with hepatic impairment, given the lack of data on its safety and efficacy in this population. Regular monitoring of liver function may be prudent in these cases, although specific parameters are not defined in the available prescribing information.

Overdosage

In the event of an overdose, it is imperative to seek immediate medical assistance. Healthcare professionals are advised to contact a Poison Control Center at 1-800-222-1222 for guidance on managing the situation effectively.

Prompt intervention is crucial to mitigate potential adverse effects associated with overdose. Symptoms may vary depending on the substance involved, and healthcare providers should be prepared to assess and manage these symptoms accordingly.

Management procedures may include supportive care and symptomatic treatment, tailored to the specific clinical presentation of the patient. Continuous monitoring and evaluation are essential to ensure patient safety and to address any complications that may arise during the course of treatment.

Nonclinical Toxicology

If pregnant or breastfeeding, it is advised to consult a health professional prior to use. No specific non-teratogenic effects have been identified in the available data. Additionally, there are no detailed findings regarding nonclinical toxicology or animal pharmacology and toxicology provided in the current information.

Postmarketing Experience

No postmarketing experience details are available in the insert.

Patient Counseling

Healthcare providers should advise patients to seek immediate medical assistance or contact a Poison Control Center at 1-800-222-1222 in the event of an overdose. It is crucial to inform patients that this product should not be used concurrently with prescription monoamine oxidase inhibitors (MAOIs), which are medications prescribed for depression, psychiatric or emotional conditions, or Parkinson’s disease. Patients should be instructed to refrain from using this product for at least two weeks after discontinuing an MAOI. If patients are uncertain whether their prescription medication contains an MAOI, they should be encouraged to consult with their doctor or pharmacist.

Patients should be informed to discontinue use and consult a healthcare professional if their cough persists for more than seven days, returns, or is accompanied by fever, rash, or a persistent headache, as these symptoms may indicate a serious condition. It is important to emphasize that patients must adhere to the recommended dosage and not exceed the directed amount while using this product.

Additionally, healthcare providers should recommend that patients consult with a doctor prior to use if they have a persistent or chronic cough, such as that associated with smoking, asthma, chronic bronchitis, or emphysema, or if their cough is accompanied by excessive phlegm (mucus).

Storage and Handling

The product is supplied in various package configurations, with specific NDC numbers available for identification. It is essential to store the product at a temperature range of 20-25°C (68-77°F). Refrigeration is not recommended, as it may compromise the integrity of the product. Proper handling and storage conditions must be adhered to in order to maintain product efficacy and safety.

Additional Clinical Information

No further data are available.

Drug Information (PDF)

This file contains official product information for Mucus Dm, including active ingredients, dosage, warnings, and labeling as submitted by the manufacturer for OTC distribution.

View product document (PDF)

Data Generation & Sources

This page was automatically generated and is maintained by the AllDrugs AI Data-Science Team. It was built from the FDA Structured Product Label (DailyMed) for Mucus Dm, retrieved by a validated AI data-extraction workflow.

All FDA-listed dosage forms and strengths are shown in the Packaging & NDC Codes section above. Regulatory status appears in the Summary Information panel above and was verified in the FDA National Drug Code directory and the NSDE NDC Directory daily file.

Note: an automated daemon monitors NSDE checksums; when the record for this NDC changes, the new file is pulled instantly and this page is refreshed.

No human clinician has reviewed this version.

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Regulatory data notice: Information on this page is reproduced verbatim from FDA public databases (NSDE, Orange Book, Purple Book, DailyMed SPL). NDA/ANDA drugs are FDA-approved, BLA biologics are FDA-licensed. Inclusion alone does not guarantee current market availability or imply FDA endorsement.

Medical disclaimer: This AI-generated content is provided for educational purposes only and does not constitute medical advice. Always consult a licensed healthcare professional for diagnosis or treatment decisions.