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Maximum Strength Guaifenesin Dm

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Active ingredients
  • Guaifenesin 1200 mg
  • Dextromethorphan Hydrobromide 60 mg
Other brand names
Drug classes
Expectorant, Sigma-1 Agonist, Uncompetitive N-methyl-D-aspartate Receptor Antagonist
Dosage form
Tablet, Extended Release
Route
Oral
Prescription status
OTC (over the counter)
Marketed in the U.S.
Since 2018
Label revision date
February 10, 2026
Active ingredients
  • Guaifenesin 1200 mg
  • Dextromethorphan Hydrobromide 60 mg
Other brand names
Drug classes
Expectorant, Sigma-1 Agonist, Uncompetitive N-methyl-D-aspartate Receptor Antagonist
Dosage form
Tablet, Extended Release
Route
Oral
Prescription status
OTC (over the counter)
CSA schedule
Not a scheduled drug
Marketed in the U.S.
Since 2018
Label revision date
February 10, 2026
Manufacturer
Rugby Laboratories
Registration number
ANDA209692
NDC root
0536-1213

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Drug Overview

Mucus Relief DM is a maximum strength medication designed to help you manage cough and mucus associated with minor throat and bronchial irritation, such as that caused by the common cold or inhaled irritants. It contains two active ingredients: guaifenesin (an expectorant that helps loosen phlegm and thin bronchial secretions) and dextromethorphan HBr (a cough suppressant that reduces the urge to cough).

This extended-release tablet provides up to 12 hours of relief, making it easier for you to breathe and sleep by thinning and loosening mucus, while also controlling the intensity of your cough.

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 taking this medication, it's important to swallow the tablet whole—do not crush, chew, or break it. Make sure to take it with a full glass of water, which helps the tablet dissolve properly. You can take this medication without worrying about whether you've eaten or not.

For adults and children aged 12 years and older, the recommended dosage is one tablet every 12 hours. However, you should not take more than two tablets in a 24-hour period. If you have children under 12 years of age, this medication is not suitable for them, so please avoid using it for that age group.

What to Avoid

You should avoid using this product if you are under 12 years of age. Additionally, do not take it if you are currently using a prescription monoamine oxidase inhibitor (MAOI), which is a type of medication often prescribed for depression, psychiatric conditions, or Parkinson's disease. If you have recently stopped taking an MAOI, wait at least two weeks before using this product. If you're unsure whether your medication contains an MAOI, please consult your doctor or pharmacist.

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 when using any medication.

Side Effects

You should be aware of some important side effects and warnings associated with this medication. It is not recommended for children under 12 years old, and you should avoid using it if you are currently taking a prescription monoamine oxidase inhibitor (MAOI) or have taken one in the past two weeks. If you're unsure whether your medication contains an MAOI, consult your doctor or pharmacist.

Before using this product, consult 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. 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 condition.

Warnings and Precautions

You should not use this medication if you are under 12 years old. Additionally, avoid 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. 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 long-lasting cough due to smoking, asthma, chronic bronchitis, or emphysema, or if your cough is producing a lot of mucus. If you experience an overdose, seek medical help immediately or contact a Poison Control Center at 1-800-222-1222.

You should stop using this medication 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 1-800-222-1222 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 considering medication for your child. This particular medication should not be used for children under 12 years of age. For those who are 12 years and older, the recommended dosage is one tablet every 12 hours, with a maximum of two tablets in a 24-hour period. Always follow these guidelines to ensure your child's safety and well-being.

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 before starting the medication. 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 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 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. While there are no specific drug interactions or laboratory test interactions noted for this medication, your healthcare provider can help ensure that everything you are taking works well together and is safe for you.

Always feel free to ask questions and share your complete list of medications and any lab tests you may be undergoing. This way, you can receive the best possible care tailored to your needs.

Storage and Handling

To ensure the best performance of your product, store it at a temperature between 20º to 25ºC (68º to 77ºF). This temperature range helps maintain the integrity and effectiveness of the device.

When handling the product, be sure to do so with care to avoid any damage. Always follow any specific instructions provided for use and disposal to ensure safety and compliance.

Additional Information

You should take this medication orally. For adults and children aged 12 years and older, the recommended dosage is 1 tablet every 12 hours, with a maximum of 2 tablets in a 24-hour period. If you are caring for a child under 12 years of age, do not use this medication for them. Always follow the dosage instructions provided by your healthcare provider.

FAQ

What is Mucus Relief DM?

Mucus Relief DM is a maximum strength medication that contains Guaifenesin (1200 mg) as an expectorant and Dextromethorphan HBr (60 mg) as a cough suppressant, available in extended release tablets.

How does Mucus Relief DM work?

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

Who should not use Mucus Relief DM?

Do not use Mucus Relief DM for children under 12 years of age or if you are taking a prescription monoamine oxidase inhibitor (MAOI) or have taken one within the last two weeks.

What is the recommended dosage for adults?

Adults and children 12 years of age and older should take 1 tablet every 12 hours, not exceeding 2 tablets in 24 hours.

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 use and consult a doctor as these may be signs of a serious illness.

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

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

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 Mucus Relief DM?

Store Mucus Relief DM between 20º to 25ºC (68º to 77ºF).

Packaging Info

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

Packaging configurations for Maximum Strength Guaifenesin Dm.
Details

Drug Information (PDF)

This file contains official product information for Maximum Strength Guaifenesin 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 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

Patients should take the tablet whole, without crushing, chewing, or breaking it. It is recommended to ingest the tablet with a full glass of water. This medication can be administered without regard to the timing of meals.

For adults and children aged 12 years and older, the recommended dosage is 1 tablet every 12 hours, with a maximum of 2 tablets in a 24-hour period. This medication is not indicated for use in children under 12 years of age.

Contraindications

Use of this product is contraindicated in the following situations:

  • Children under 12 years of age.

  • Patients currently taking a prescription monoamine oxidase inhibitor (MAOI) or those who have discontinued MAOI therapy within the past 2 weeks. MAOIs are commonly prescribed for depression, psychiatric or emotional conditions, or Parkinson's disease. If there is uncertainty regarding the presence of an MAOI in a prescription medication, consultation with a healthcare professional is advised.

Warnings and Precautions

The use of this product is contraindicated in children under 12 years of age. Additionally, it must not be administered to individuals currently taking a prescription monoamine oxidase inhibitor (MAOI) or within two weeks of discontinuing such medication. MAOIs are commonly prescribed for depression, psychiatric or emotional conditions, and Parkinson's disease. If there is uncertainty regarding the presence of an MAOI in a prescription medication, it is imperative to consult a healthcare professional, such as a doctor or pharmacist, prior to use.

Healthcare professionals should advise patients to seek medical guidance before using this product if they have a persistent or chronic cough, particularly those associated with smoking, asthma, chronic bronchitis, or emphysema. Furthermore, individuals experiencing a cough accompanied by excessive phlegm (mucus) should also consult a healthcare provider.

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.

Patients should be instructed to discontinue use and consult a healthcare professional if their cough persists for more than 7 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 specific populations. The product is contraindicated for use in children under 12 years of age. Additionally, it should not be used in conjunction with prescription monoamine oxidase inhibitors (MAOIs) or within 2 weeks of discontinuing such medications. Patients are advised to consult a healthcare professional if they are uncertain whether their prescription includes an MAOI.

Common adverse reactions may include persistent or chronic cough, especially in individuals with underlying conditions such as smoking, asthma, chronic bronchitis, or emphysema. Patients experiencing a cough accompanied by excessive phlegm (mucus) should seek medical advice prior to use.

Patients are also instructed 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, as these symptoms may indicate a serious underlying condition.

Drug Interactions

There are currently no documented drug interactions associated with the use of 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 Maximum Strength Guaifenesin Dm (guaifenesin, dextromethorphan hbr). Columns show Packaging, Formulation Type, and Active Ingredient Strength.

Packaging configurations for Maximum Strength Guaifenesin 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 1 tablet every 12 hours, with a maximum of 2 tablets in a 24-hour period. Caution is advised when considering the use of this medication in pediatric populations, as safety and efficacy have not been established for those younger than 12 years.

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 adverse effects or changes in therapeutic response, 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 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 patients 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 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 or contact a Poison Control Center without delay. Healthcare professionals should advise patients or caregivers to call the Poison Control Center at 1-800-222-1222 for guidance.

Prompt intervention is crucial in managing overdose situations, as timely medical help can significantly influence outcomes. Symptoms of overdose may vary depending on the substance involved and the individual’s health status. Therefore, a thorough assessment and monitoring of the patient are essential.

Management procedures may include supportive care and symptomatic treatment, tailored to the specific symptoms presented. Healthcare providers should remain vigilant and prepared to implement appropriate interventions based on the clinical scenario.

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 respiratory depression have also been documented.

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 important to inform patients that this product is not recommended for use in children under 12 years of age.

Patients should be cautioned against using this product if they are currently taking a prescription monoamine oxidase inhibitor (MAOI) or have taken one within the past two weeks. Healthcare providers should encourage patients to consult with a doctor or pharmacist if they are uncertain whether their prescription medication contains an MAOI.

Patients must be instructed to discontinue use and consult a healthcare professional 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 illness.

When using this product, patients should be reminded to adhere strictly to the recommended dosage and not exceed the directed amount. Additionally, healthcare providers should advise patients to consult a doctor prior to use 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 various package configurations, with specific NDC numbers available for identification. It is essential to store the product at a controlled room temperature, specifically between 20º to 25ºC (68º to 77ºF). Proper storage conditions must be maintained to ensure the integrity and efficacy of the product.

Additional Clinical Information

The medication is administered orally. For adults and children aged 12 years and older, the recommended dosage is one tablet every 12 hours, with a maximum of two tablets in a 24-hour period. It is not recommended for use in children under 12 years of age. No additional information is available regarding laboratory tests, abuse potential, patient counseling, or postmarketing experience.

Drug Information (PDF)

This file contains official product information for Maximum Strength Guaifenesin 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 Guaifenesin 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.