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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
Solution
Route
Oral
Prescription status
OTC (over the counter)
Marketed in the U.S.
Since 2020
Label revision date
November 26, 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
Solution
Route
Oral
Prescription status
OTC (over the counter)
CSA schedule
Not a scheduled drug
Marketed in the U.S.
Since 2020
Label revision date
November 26, 2025
Manufacturer
WALGREENS CO
Registration number
M012
NDC root
0363-7390

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Drug Overview

DM Max 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.

DM Max 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 not only helps make your coughs more productive but also aids in reducing coughing intensity, allowing for better rest, especially at night.

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.

It can temporarily relieve coughs caused by minor throat and bronchial irritation, which may happen due to the common cold or exposure to irritants. Additionally, it can reduce the intensity of your cough and help suppress 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. You should not take more than 6 doses within a 24-hour period. To measure your dose accurately, use only the dosing cup that comes with the medication, and avoid using it with any other products to prevent confusion.

For adults and children aged 12 years and older, the recommended dose is 20 mL every 4 hours. If you are caring for a child under 12 years of age, do not use this medication for them. Always consult with your doctor if you have any questions or need further guidance on how to take this medication.

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. Misusing 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 for two weeks after stopping an MAOI. If you're unsure whether your prescription includes an MAOI, consult your doctor or pharmacist.

Before using this medication, talk to your doctor if you have a persistent cough due to smoking, asthma, chronic bronchitis, or emphysema, or if your cough produces a lot of mucus. You should stop using the medication and seek medical advice if your cough lasts more than seven days, returns, or is accompanied by fever, rash, or a persistent headache, as these may indicate a more serious issue. If you are pregnant or breastfeeding, consult a healthcare professional before use, and always keep this medication out of reach of children. In case of an overdose, seek immediate medical help or contact a Poison Control Center 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, 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. If you experience an overdose, seek medical help immediately or contact a Poison Control Center at 1-800-222-2222. Additionally, stop using the product and call your doctor if your cough lasts more than 7 days, returns, or is accompanied by 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 your health, 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

It’s important to be cautious when giving medication to children. For children under 12 years of age, this medication should not be used at all. If you have a child who is 12 years or older, the recommended dosage is 20 mL every 4 hours, but make sure not to exceed 6 doses in a 24-hour period.

When measuring the dose, always use the dosing cup that comes with the medication, and avoid using it for any other products to ensure accurate dosing. Following these guidelines will help keep your child safe while using this medication.

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, it’s important to consult with a healthcare provider for personalized advice. They can help determine the best approach to using this medication safely and effectively, considering any unique health needs or conditions that may be present. Always prioritize open communication with your healthcare team to 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 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 you understand how to manage your treatment effectively while considering your kidney 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 should be used 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 have open conversations with your healthcare provider about any medications or tests you may be taking. Currently, there are no specific drug interactions or laboratory test interactions noted for this medication. However, your healthcare provider can help ensure that your treatment plan is safe and effective, taking into account all the medications and tests you may be using. Always feel free to ask questions and share your complete health history to avoid any potential issues.

Storage and Handling

To ensure the best performance of your product, store it at room temperature. It's important to avoid refrigerating it, as this can affect its effectiveness. When using the product, a dosing cup is provided to help you measure the correct amount safely and accurately.

Always handle the product with clean hands to maintain its integrity. Following these simple storage and handling guidelines will help you use the product safely and effectively.

Additional Information

You should take this medication orally, with the recommended dose for adults and children aged 12 years and older being 20 mL every 4 hours. If your child is under 12 years old, do not use this medication.

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

FAQ

What is DM Max used for?

DM Max helps loosen phlegm (mucus) and thin bronchial secretions, making coughs more productive. It temporarily relieves cough due to minor throat and bronchial irritation from the common cold or inhaled irritants.

What are the active ingredients in DM Max?

DM Max contains DEXTROMETHORPHAN HBr 20 mg, a cough suppressant, and GUAIFENESIN 400 mg, an expectorant.

Who can use DM Max?

DM Max 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 DM Max?

The recommended dosage for adults and children 12 years and older is 20 mL every 4 hours, with a maximum of 6 doses in any 24-hour period.

Are there any contraindications for using DM Max?

Do not use DM Max 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 persistent headache, stop using DM Max and consult a doctor.

Can I use DM Max if I am pregnant or breastfeeding?

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

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.

How should DM Max be stored?

Store DM Max at room temperature and do not refrigerate.

Packaging Info

Below are the non-prescription pack sizes of Mucus Relief Dm (dextromethorphan hbr and 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

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.

No teratogenic or nonteratogenic effects have been reported.

Dosage and Administration

The maximum recommended dosage is 6 doses within a 24-hour period. Administration should be performed using the dosing cup provided with the product; it is essential to avoid using this dosing cup with any other products to ensure accurate measurement.

For adults and children aged 12 years and older, the recommended dose is 20 mL every 4 hours, as needed. It is important to adhere to this dosing schedule unless otherwise directed by a healthcare professional.

This product is not indicated for use in children under 12 years of age.

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

It is imperative to adhere to the following warnings and precautions to ensure the safe use of this product.

Warnings 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, this product 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 medication.

General Precautions Prior to using this product, patients should 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 that is accompanied by excessive phlegm (mucus) should also consult a healthcare provider.

Emergency Medical Help Instructions In the event of an overdose, it is crucial to seek immediate medical assistance or contact a Poison Control Center at 1-800-222-2222.

Stop Taking and Call Your Doctor Instructions Patients are 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 persistent headache. These symptoms may indicate a serious underlying condition that requires medical evaluation.

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 discontinued a prescription monoamine oxidase inhibitor (MAOI). The use of this product is contraindicated in such cases, and patients are advised to consult a healthcare professional if they are uncertain whether their prescription includes an MAOI.

Common adverse reactions include the need for caution in patients with persistent or chronic cough, such as that associated with smoking, asthma, chronic bronchitis, or emphysema. Additionally, patients experiencing a cough accompanied by excessive phlegm (mucus) should seek medical advice prior to use.

Patients are advised to discontinue use and consult a healthcare provider if their cough persists for more than 7 days, recurs, or is accompanied by fever, rash, or a persistent headache. These symptoms may indicate a more serious underlying condition.

It is also important for patients who are pregnant or breastfeeding to seek guidance from a healthcare professional before using this product. Furthermore, the product should be kept out of reach of children, and in the event of an overdose, immediate medical assistance should be sought or the Poison Control Center contacted at 1-800-222-2222.

Drug Interactions

There are currently no documented drug interactions associated with this medication. Additionally, there is no information available regarding interactions with laboratory tests. As such, no specific recommendations for dosage adjustments or monitoring are warranted at this time.

Packaging & NDC

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

Packaging configurations for Mucus Relief Dm.
Details

Pediatric Use

Pediatric patients under 12 years of age should not use this medication. For adolescents 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, and this cup should not be used with other products to ensure accurate dosing.

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 they may have altered pharmacokinetics and pharmacodynamics. Close monitoring is recommended to ensure safety and efficacy in 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 on 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 studied in relation to dosage adjustments, special monitoring, or safety considerations for this medication. As such, there is no available information regarding the use of this drug in individuals with reduced kidney function. Healthcare professionals should exercise caution and consider the lack of data when prescribing this medication to patients with renal impairment.

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 typically involves supportive care and symptomatic treatment. Continuous monitoring of the patient's vital signs and clinical status is essential. Depending on the specific circumstances and the substance involved, additional interventions may be necessary to ensure patient safety and recovery.

Nonclinical Toxicology

If pregnant or breast-feeding, it is advised to consult a health professional before 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

During postmarketing experience, the following adverse reactions have been reported voluntarily or through surveillance programs:

Allergic reactions, including anaphylaxis and angioedema, have been noted. Serious skin reactions such as Stevens-Johnson syndrome and toxic epidermal necrolysis have also been documented. Additional reported events include dizziness, drowsiness, nausea, vomiting, abdominal pain, and diarrhea. Neuropsychiatric effects such as hallucinations and confusion have been observed. Cardiovascular events, including increased heart rate (tachycardia) and hypertension, have been reported. Lastly, instances of respiratory depression have been identified.

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 and integrity. Proper handling is essential to preserve the quality of the product.

Additional Clinical Information

The medication is administered orally, with a recommended dosage of 20 mL every 4 hours for adults and children aged 12 years and older. It is contraindicated for use in children under 12 years of age.

Clinicians should counsel patients to consult a health professional if they are pregnant or breastfeeding. Additionally, it is important 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.

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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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.