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Maximum Strength Mucus Relief 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 2018
Label revision date
October 28, 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 2018
Label revision date
October 28, 2025
Manufacturer
Wal-Mart Stores, Inc. ,
Registration number
M012
NDC root
49035-839

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Drug Overview

Mucus Relief DM is a medication designed to help you manage cough and chest congestion. It works by loosening phlegm (mucus) and thinning bronchial secretions, making it easier to clear your airways. This product temporarily relieves cough caused by minor throat and bronchial irritation, which can occur with the common cold or from inhaling irritants.

Mucus Relief DM contains two active ingredients: Dextromethorphan HBr, which acts as a cough suppressant to reduce the urge to cough, and Guaifenesin, an expectorant that helps thin and loosen mucus. This combination provides multi-symptom relief, allowing for more productive coughs and helping you get a better night's sleep.

Uses

This medication is designed to help you breathe easier by loosening phlegm (mucus) and thinning bronchial secretions. This action helps clear out bothersome mucus from your airways, making your coughs more productive.

You can use this medication to temporarily relieve coughing caused by minor throat and bronchial irritation, which can happen with the common cold or from inhaling irritants. It also helps reduce the intensity of your cough and can lessen the urge to cough, making it easier for you to get a good night's sleep.

Dosage and Administration

It's important to follow the correct dosage when taking this medication to ensure your safety and effectiveness. For adults and children aged 12 years and older, you should take 20 mL every 4 hours, but remember not to exceed 6 doses in a 24-hour period. If you have any questions about your specific situation, it's always best to consult with your doctor.

When measuring your dose, use only the dosing cup that comes with the medication. This ensures you get the right amount. Avoid using this dosing cup with any other products, as it could lead to incorrect measurements. If your child is under 12 years old, do not use this medication for them. Always prioritize safety and follow these guidelines closely.

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 conditions, or Parkinson's disease. Additionally, you should 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 before using this product.

It's also important to follow the dosage instructions carefully and not exceed the recommended amount. Misuse or taking more than directed can lead to serious health issues, including dependence (a condition where your body becomes reliant on a substance). 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. Do not use it if you are currently taking a monoamine oxidase inhibitor (MAOI), which is a type of medication for depression or certain other conditions, or if you have stopped taking an MAOI within the last two weeks. If you have a persistent cough due to smoking, asthma, chronic bronchitis, or emphysema, consult your doctor before using this product.

If your cough lasts more than seven days, returns, or is accompanied by fever, rash, or a persistent headache, stop using the medication and seek medical advice, as these may indicate a more serious issue. Additionally, if you are pregnant or breastfeeding, it's important to consult a healthcare professional before use. Always keep this medication out of reach of children, and in case of an overdose, contact a medical professional or Poison Control Center immediately at 1-800-222-2222.

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. Additionally, you should wait at least two weeks after stopping an MAOI before using this product. If you're unsure whether your medication contains an MAOI, please consult your doctor or pharmacist.

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. If you experience an overdose, seek emergency medical help immediately or contact a Poison Control Center at 1-800-222-2222.

You should stop using this product and call your doctor if your cough lasts more than seven days, returns, or occurs with symptoms like fever, rash, or a persistent headache, as these may indicate a more serious health issue.

Overdose

If you suspect an overdose, it’s crucial to seek medical help immediately. You can contact a Poison Control Center at 1-800-222-2222 for guidance. Signs of an overdose can vary, but they may include unusual drowsiness, confusion, or difficulty breathing.

Always take overdosing seriously. If you notice any of these symptoms or have concerns about a possible overdose, don’t hesitate to reach out for help right away. Your safety is 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

If you are considering this medication for your child, it's important to know that it should not be used in children under 12 years of age. For those aged 12 and older, the recommended dosage is 20 mL every 4 hours, but you should not exceed 6 doses in a 24-hour period. Always use the dosing cup that comes with the medication to ensure accurate measurement, and avoid using it with other products.

Additionally, keep this medication out of reach of younger children. If an overdose occurs, seek medical help immediately or contact a Poison Control Center at 1-800-222-2222. Your child's safety is the top priority, so please follow these guidelines carefully.

Geriatric Use

When it comes to using this medication in older adults, there is no specific information available about dosage adjustments, safety concerns, or special precautions. This means that if you or a loved one is an older adult considering this medication, it’s important to consult with a healthcare provider. They can help determine the best approach based on individual health needs and any other medications being taken. Always prioritize open communication with your healthcare team to ensure safe and effective treatment.

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 should be used 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 determine the best course of action based on your kidney function and overall health.

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 important to be cautious when taking certain medications. If you are currently using a prescription monoamine oxidase inhibitor (MAOI), or if you have stopped taking one within the last two weeks, you should avoid using this medication. Combining these can lead to serious interactions that may affect your health.

Always discuss any medications you are taking with your healthcare provider. They can help ensure that your treatments are safe and effective, and they can provide guidance on any potential risks. Your health and safety should always come first.

Storage and Handling

To ensure the best use of your product, store it at room temperature. It's important not to refrigerate it, as this can affect its effectiveness. When you're ready to use the product, a dosing cup is provided to help you measure the correct amount safely and accurately.

Always handle the product with clean hands and ensure that the dosing cup is also clean before use. Following these simple guidelines will help you use the product safely and effectively.

Additional Information

You should take this medication orally. If you are pregnant or breastfeeding, it's important to consult a healthcare professional before using it. Always keep this medication out of reach of children. In case of an overdose, seek medical help immediately or contact a Poison Control Center at 1-800-222-2222.

FAQ

What is Mucus Relief DM used for?

Mucus Relief DM helps loosen phlegm (mucus) and thin bronchial secretions, making coughs more productive and relieving cough due to minor throat and bronchial irritation.

What are the active ingredients in Mucus Relief DM?

Mucus Relief DM contains Dextromethorphan HBr, a cough suppressant, and Guaifenesin, an expectorant.

Who can use Mucus Relief DM?

Mucus Relief DM is for adults and children aged 12 years and older. It should not be used by children under 12 years of age.

What is the recommended dosage for adults and children 12 years and older?

The recommended dosage is 20 mL every 4 hours, with a maximum of 6 doses in any 24-hour period.

Are there any contraindications for using Mucus Relief DM?

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

What should I do if I experience side effects?

Stop using Mucus Relief DM and consult a doctor if your cough lasts more than 7 days, returns, or occurs with fever, rash, or persistent headache.

Can I use Mucus Relief DM if I am pregnant or breastfeeding?

If you are pregnant or breastfeeding, consult a health professional before using Mucus Relief DM.

How should I store Mucus Relief DM?

Store Mucus Relief DM at room temperature and do not refrigerate.

What should I do in case of an overdose?

In case of overdose, seek medical help or contact a Poison Control Center immediately at 1-800-222-2222.

Packaging Info

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

Packaging configurations for Maximum Strength Mucus Relief Dm.
Details

Drug Information (PDF)

This file contains official product information for Maximum Strength Mucus Relief 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 specified 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 aids in loosening phlegm (mucus) and thinning bronchial secretions, thereby facilitating the expulsion of bothersome mucus and enhancing the productivity of coughs.

Additionally, this drug temporarily alleviates the intensity of coughing and reduces the impulse to cough, which may assist patients in achieving restful sleep.

There are no teratogenic or nonteratogenic effects associated with this drug.

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 exclusively for measuring the dose and not for any other products.

For adults and children aged 12 years and older, the recommended dose is 20 mL administered every 4 hours as needed.

Children under 12 years of age should not use this product. Healthcare professionals should ensure that patients adhere to these guidelines to avoid potential overdose and ensure safe administration.

Contraindications

Use of this product is contraindicated in patients currently taking a prescription monoamine oxidase inhibitor (MAOI), which includes certain medications for depression, psychiatric or emotional conditions, or Parkinson's disease. Additionally, use is contraindicated for a period of 2 weeks following the discontinuation of an MAOI. Patients should consult a healthcare professional if uncertain whether their prescription medication contains an MAOI.

Exceeding the recommended dosage is also contraindicated.

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 they are uncertain whether their prescription medication contains an MAOI.

Before initiating treatment, it is essential for healthcare providers to inquire about the patient's medical history, particularly if the patient has a persistent or chronic cough associated with smoking, asthma, chronic bronchitis, or emphysema. Furthermore, caution is warranted in patients experiencing a cough accompanied by excessive phlegm (mucus).

In the event of an overdose, immediate medical assistance should be sought, or the Poison Control Center should be contacted at 1-800-222-2222.

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

Side Effects

Patients should be aware of the following adverse reactions associated with the use of this product.

Serious adverse reactions may occur, particularly in patients who are currently taking or have recently taken a prescription monoamine oxidase inhibitor (MAOI). The use of this product is contraindicated in such cases, and patients should refrain from using it for at least two weeks after discontinuing an MAOI. It is essential for patients to consult a healthcare professional if they are uncertain whether their prescription medication contains an MAOI.

Patients with persistent or chronic cough, such as that associated with smoking, asthma, chronic bronchitis, or emphysema, should seek medical advice before using this product. Additionally, those experiencing a cough accompanied by excessive phlegm (mucus) should also consult a healthcare provider prior to use.

Patients are advised to discontinue use and seek medical attention if their cough persists for more than seven days, recurs, or is accompanied by fever, rash, or a persistent headache, as these symptoms may indicate a serious underlying condition.

For pregnant or breastfeeding patients, it is recommended to consult a healthcare professional before using this product. Furthermore, this product should be kept out of reach of children. In the event of an overdose, immediate medical assistance should be sought, or the Poison Control Center should be contacted at 1-800-222-2222.

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, as this may result in serious interactions.

No additional drug interactions or laboratory test interactions have been identified for this medication. Therefore, no further dosage adjustments or monitoring recommendations are necessary beyond the contraindication with MAOIs.

Packaging & NDC

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

Packaging configurations for Maximum Strength Mucus Relief Dm.
Details

Pediatric Use

Pediatric patients under 12 years of age should not use this medication. For patients aged 12 years and older, the recommended dosage is 20 mL every 4 hours, with a maximum of 6 doses in any 24-hour period. It is essential to measure the dosage using only the dosing cup provided with the medication; using a dosing cup from other products is not advised.

Healthcare professionals should emphasize the importance of keeping 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 1-800-222-2222.

Geriatric Use

There is no specific information available 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. It is advisable to monitor these patients closely for any adverse effects or changes in efficacy, given the lack of targeted data for this population.

Pregnancy

Pregnant patients and those who are breastfeeding should consult a healthcare professional prior to using this medication. The potential risks and benefits must be carefully weighed, as the effects on fetal outcomes and lactation are not fully established. It is essential for women of childbearing potential to seek medical advice to ensure safe use during pregnancy and lactation.

Lactation

Lactating mothers are advised to consult a health professional prior to using this medication. There is currently no available data regarding the excretion of this medication in human 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 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. Regular monitoring of renal function may be advisable in these patients to ensure safety and efficacy.

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 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 without delay. The national helpline for poison control can be reached at 1-800-222-2222.

Prompt intervention is crucial in managing potential overdose situations. Symptoms may vary depending on the substance involved, and healthcare providers should be prepared to assess and address any clinical manifestations that arise.

Management of an overdose may include supportive care and symptomatic treatment, tailored to the specific circumstances and the patient's condition. Continuous monitoring and evaluation are essential to ensure patient safety and effective recovery.

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

Postmarketing experience has identified several adverse reactions reported voluntarily or through surveillance programs. These include dizziness, nausea, vomiting, rash, and allergic reactions, which may encompass anaphylaxis. Additionally, cases of hallucinations, confusion, agitation, increased heart rate, and shortness of breath have also been documented. These reactions were observed during the postmarketing surveillance of the product.

Patient Counseling

Healthcare providers should advise patients to keep the medication out of reach of children to prevent accidental ingestion. In the event of an overdose, patients should be instructed to seek medical help immediately or contact a Poison Control Center at 1-800-222-2222.

Patients must be cautioned not to exceed the recommended dosage. They should be informed to discontinue use and consult a doctor if their cough persists for more than 7 days, returns, or is accompanied by fever, rash, or a persistent headache, as these symptoms may indicate a serious condition.

Additionally, healthcare providers should encourage patients to consult a doctor prior to use if they have a persistent or chronic cough associated with smoking, asthma, chronic bronchitis, or emphysema. Patients should also be advised to seek medical advice if their cough is accompanied by excessive phlegm (mucus).

Storage and Handling

The product is supplied with a dosing cup included for accurate measurement. It should be stored at room temperature, ensuring that it is not refrigerated to maintain its efficacy. Proper handling is essential to preserve the integrity of the product.

Additional Clinical Information

The medication is administered orally. Clinicians should advise patients who are pregnant or breastfeeding to consult a health professional prior to use. It is essential to keep the medication out of reach of children. In the event of an overdose, patients should seek medical assistance or contact a Poison Control Center immediately at 1-800-222-2222. No further information is available regarding laboratory tests, abuse potential, or postmarketing experience.

Drug Information (PDF)

This file contains official product information for Maximum Strength Mucus Relief 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 Maximum Strength Mucus Relief 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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Orange Book data shown on this page are limited to Regulatory Status (Rx), Established Pharmacologic Class (EPC), and Mechanism of Action (MoA).

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.