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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 2020
Label revision date
July 22, 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 2020
Label revision date
July 22, 2025
Manufacturer
Cardinal Health (Leader) 70000
Registration number
M012
NDC root
70000-0565

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Drug Overview

Maximum Strength Mucus Relief DM is a medication designed to help relieve cough and chest congestion. It contains two active ingredients: dextromethorphan HBr, which acts as a cough suppressant, and guaifenesin, an expectorant that helps loosen phlegm (mucus) and thin bronchial secretions. This combination works to make your coughs more productive by clearing out bothersome mucus from your bronchial passageways.

This product is intended for individuals aged 12 years and older and temporarily alleviates cough caused by minor throat and bronchial irritation, which can occur with the common cold or from inhaled irritants. It also helps reduce the intensity of coughing and the urge to cough, making it easier for you to rest and 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

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. If you are giving this medication to someone, make sure to measure the dose using the dosing cup that comes with the product, as using any other device could lead to incorrect dosing.

If the person needing the medication is under 12 years of age, do not use this product. Always keep the dosing cup with the medication to ensure you have the right measuring tool on hand. Following these guidelines will help you use the medication safely and effectively.

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 often prescribed 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. Do not exceed the recommended 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 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 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 related 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, certain psychiatric conditions, or Parkinson's disease. 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. Always follow the dosage instructions carefully and do not exceed the recommended amount. If your cough lasts more than seven 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.

Don’t wait for symptoms to worsen; getting prompt assistance can be vital. Always prioritize your health and safety by reaching out for help as soon as you notice any concerning symptoms.

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 to address any concerns you may have regarding breastfeeding and medication use.

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 help 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 available about the use of this medication in older adults, it’s important to approach any new treatment with caution. If you or a loved one is an older adult, always consult with a healthcare provider before starting a new medication. They can help assess any potential risks and ensure that the treatment is safe and appropriate for your individual health needs.

Remember, older adults may have different responses to medications, so discussing any concerns or existing health conditions with your doctor is essential for safe and effective care.

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 important to be cautious about combining medications. If you are currently taking a prescription monoamine oxidase inhibitor (MAOI), which is a type of medication used for depression, certain psychiatric conditions, or Parkinson's disease, you should not use this product. Additionally, you should wait at least two weeks after stopping an MAOI before starting this medication. If you're unsure whether your current prescription includes an MAOI, please consult your doctor or pharmacist for clarification.

Always discuss any medications you are taking with your healthcare provider to ensure your safety and avoid potentially harmful interactions. Your health is a priority, and your provider can help you navigate any concerns about your treatments.

Storage and Handling

To ensure the best quality and safety of your product, store it at room temperature, specifically between 20-25ºC (68-77ºF). It's important not to refrigerate the product, as this can affect its effectiveness. Always keep the dosing cup with the product for proper use.

Before using, check the safety seal around or under the cap. If it is broken or missing, do not use the product, as this indicates it may have been tampered with. Once opened, remember to discard the product to maintain safety and effectiveness.

Additional Information

You will take this medication orally. There are no additional details available regarding laboratory tests, abuse potential, patient counseling, or postmarketing experiences. If you have any questions or concerns about your treatment, be sure to discuss them with your healthcare provider.

FAQ

What is Maximum Strength Mucus Relief DM used for?

Maximum Strength Mucus Relief DM is used as a cough suppressant and expectorant to help loosen phlegm (mucus) and relieve cough due to minor throat and bronchial irritation.

What are the active ingredients in Maximum Strength Mucus Relief DM?

The active ingredients are Dextromethorphan HBr 20 mg, which acts as a cough suppressant, and Guaifenesin 400 mg, which is an expectorant.

Who can use Maximum Strength Mucus Relief DM?

This product is intended for adults and children aged 12 years and over. It should not be used by children under 12 years of age.

How should I take Maximum Strength Mucus Relief DM?

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

Are there any contraindications for using this product?

Do not use if you are currently taking a prescription monoamine oxidase inhibitor (MAOI) or have taken one within the last 2 weeks.

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

If your cough lasts more than 7 days, comes back, or occurs with fever, rash, or headache, you should stop use and consult a doctor.

Is it safe to use Maximum Strength Mucus Relief DM during pregnancy or breastfeeding?

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

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.

How should I store Maximum Strength Mucus Relief DM?

Store the product between 20-25ºC (68-77ºF) and do not refrigerate. Keep the dosing cup with the product.

Packaging Info

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

Packaging configurations for Mucus Relief Dm.
Details

Drug Information (PDF)

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

View product document (PDF)

Description

Maximum Strength Mucus Relief DM contains Dextromethorphan HBr at a concentration of 20 mg and Guaifenesin at 400 mg. This formulation serves as both a cough suppressant and an expectorant, designed for individuals aged 12 years and older. It effectively controls cough and relieves chest congestion by thinning and loosening mucus, with a recommended dosing interval of four hours. The product is distributed by Cardinal Health, located in Dublin, Ohio 43017. It is important to note that this product is not manufactured or distributed by Reckitt Benckiser, the distributor of Maximum Strength Mucinex® Fast-Max® DM Max. The packaging includes a tamper-evident safety seal; do not use if the seal around or under the cap is broken or missing.

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 clearance of mucus from the bronchial passageways and making coughs more productive.

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

No teratogenic or nonteratogenic effects have been reported.

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 dosing 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), 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 while using this product.

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.

Prior to using this product, patients should be instructed 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, individuals experiencing a cough accompanied by excessive phlegm (mucus) should also consult a healthcare provider before use.

It is imperative that patients adhere strictly to the recommended dosage and not exceed the directed amount while using this product.

Patients should be advised 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 headache that lasts. These symptoms may indicate a serious underlying condition that requires medical evaluation.

In the event of an overdose, immediate medical assistance should be sought, or the Poison Control Center should be contacted at 1-800-222-1222.

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). The use of this medication is contraindicated in such cases, as it may lead to significant health risks.

Common adverse reactions include the need to discontinue use and consult a healthcare professional if a cough persists for more than 7 days, recurs, or is accompanied by fever, rash, or a headache that lasts. These symptoms may indicate a serious underlying condition that requires medical attention.

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

Drug Interactions

The concomitant use of this product with prescription monoamine oxidase inhibitors (MAOIs) is contraindicated. MAOIs are typically prescribed for the treatment of depression, psychiatric or emotional conditions, and Parkinson's disease. Patients should not take this product while on MAOIs or for a minimum of two weeks following the discontinuation of an MAOI.

It is essential for patients to consult with a healthcare professional, such as a doctor or pharmacist, to verify whether their current prescription medication contains an MAOI before initiating treatment with this product.

Packaging & NDC

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

Packaging configurations for Mucus Relief Dm.
Details

Pediatric Use

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

Elderly patients may not have specific information regarding the use of this medication, including dosage adjustments, safety concerns, or special precautions. Therefore, healthcare providers should exercise caution when prescribing this medication to geriatric patients. It is advisable to monitor these patients closely for any potential 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 considered in these populations to ensure the safety of both the mother and the fetus or infant.

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 lack of data necessitates careful clinical judgment. Regular monitoring of renal function may be advisable in these patients, although specific recommendations are not provided.

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 at 1-800-222-1222 for guidance on managing the situation effectively.

Prompt intervention is crucial in mitigating potential adverse effects associated with an 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

Postmarketing experience has identified the following adverse reactions reported voluntarily or through surveillance programs: dizziness, nausea, vomiting, and allergic reactions, which include rash, itching, and swelling.

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.

Patients should be informed that this product must not be used concurrently with prescription monoamine oxidase inhibitors (MAOIs), which are medications prescribed for depression, psychiatric or emotional conditions, or Parkinson's disease. Additionally, patients should be cautioned against 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 prior to using this product.

Healthcare providers should instruct patients to discontinue use and consult a doctor if their cough persists for more than seven days, returns, or is accompanied by fever, rash, or a headache that lasts. These symptoms may indicate a serious underlying condition.

It is important to remind patients to adhere strictly to the recommended dosage and not exceed the directed amount when using this product.

Providers should also recommend that patients consult a doctor before using this product if they have a persistent or chronic cough 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 a configuration that includes a dosing cup. It is essential to store the product at a temperature range of 20-25ºC (68-77ºF) and to avoid refrigeration.

To ensure safety and integrity, the product features a tamper-evident seal. Users should not use the product if the printed safety seal around or under the cap is broken or missing. Additionally, it is recommended to discard the product after opening to maintain safety and efficacy.

Additional Clinical Information

The medication is administered orally. There are no additional details available regarding laboratory tests, abuse information, patient counseling, or postmarketing experience.

Drug Information (PDF)

This file contains official product information for 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 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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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.