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Dm Maximum

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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 2024
Label revision date
September 17, 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 2024
Label revision date
September 17, 2025
Manufacturer
CVS WOONSOCKET PRESCRIPTION CENTER, INCORPORATED
Registration number
M012
NDC root
51316-310

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

Drug Overview

DM Maximum is a multi-symptom 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 coughs more productive by clearing mucus from the bronchial passageways, providing temporary relief from coughs caused by minor throat and bronchial irritation, such as those associated with the common cold or inhaled irritants.

With a pleasant berry flavor, DM Maximum is suitable for individuals aged 12 years and older, and its effects can last for up to four hours. This medication not only helps control the impulse to cough, making it easier for you to get to sleep, but also alleviates the intensity of coughing, allowing for a more comfortable experience when dealing with respiratory discomfort.

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 dosage instructions carefully to ensure your safety and effectiveness of the medication. You should not take more than the directed amount, and make sure not to exceed 6 doses within a 24-hour period. Always use the dose cup that comes with the medication for accurate measurement.

For adults and children aged 12 years and older, the recommended dose is 20 mL every 4 hours. However, if you are caring for children under 12 years old, this medication is not suitable for them, so please do not use it. If you have any questions or need further guidance, consult your doctor.

What to Avoid

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

It's important to follow these guidelines to prevent potential serious interactions and ensure your safety. Always prioritize open communication with your healthcare provider regarding any medications you are taking.

Side Effects

If you experience a cough that lasts more than a week, keeps coming back, or is accompanied by a fever, rash, or a persistent headache, it's important to stop using the medication and consult your doctor. These symptoms could indicate a more serious health issue that needs attention. Always prioritize your health and seek professional advice if you have concerns.

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 medication, 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 your cough lasts more than a week, keeps coming back, or is accompanied by a fever, rash, or persistent headache, stop using the product and contact your doctor, as these may be signs of a more serious issue.

In the event of an overdose, seek medical help immediately or contact a Poison Control Center. Your health and safety are important, so please take these precautions seriously.

Overdose

If you suspect an overdose, it’s crucial to seek medical help immediately or contact a Poison Control Center. Signs of an overdose can vary, but they may include unusual symptoms that are more severe than typical side effects.

Always err on the side of caution—if you notice anything concerning, don’t hesitate to reach out for professional assistance. Your health and safety are the top priority.

Pregnancy Use

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

Lactation Use

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

Pediatric Use

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

In the event of an overdose, seek medical help immediately or contact a Poison Control Center. As a parent, it's also beneficial to educate yourself about the potential for medicine abuse among teens. You can find helpful resources at www.StopMedicineAbuse.org.

Geriatric Use

When it comes to using this medication, there are no specific guidelines or recommendations for older adults. This means that the information provided does not include any special dosage adjustments, safety concerns, or precautions that would apply to you or your loved ones in this age group.

It's always a good idea to discuss any medications with your healthcare provider, especially if you are an older adult or caring for one. They can help ensure that the treatment is safe and appropriate based on individual health needs.

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 your kidneys are not functioning properly.

Always consult your healthcare provider for personalized advice and to ensure that any medication you take is safe and appropriate for your kidney health. They can help monitor your condition 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, it's essential to 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 interactions with other drugs or tests. Your safety is the top priority, so don't hesitate to ask questions about your medications.

Storage and Handling

To ensure the best performance of your product, store it at a temperature of 25°C (77°F). It’s acceptable for the temperature to vary between 15°C and 30°C (59°F to 86°F) occasionally, but try to keep it as close to the recommended temperature as possible. Always check the expiration date on the package and use the product before that date to ensure its safety and effectiveness.

When handling the product, make sure to do so with clean hands and in a safe environment to maintain its integrity. Proper storage and careful handling are key to ensuring that you get the most out of your product.

Additional Information

There is no additional information available regarding laboratory tests, administration methods, or postmarketing experiences for this medication.

If you are pregnant or breastfeeding, it’s important to consult with a healthcare professional before using this medication. Additionally, if you want to learn more about the potential for medicine abuse among teens, you can visit www.StopMedicineAbuse.org for more information.

FAQ

What is DM Maximum?

DM Maximum is a cough suppressant containing Dextromethorphan HBr and Guaifenesin, designed to control cough and relieve chest congestion.

Who can use DM Maximum?

DM Maximum is intended for adults and children aged 12 years and over. Children under 12 years should not use this product.

How does DM Maximum work?

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

What is the recommended dosage for adults and children over 12?

The recommended dosage is 20 mL every 4 hours, using the dosing cup provided. Do not exceed 6 doses in a 24-hour period.

Are there any contraindications for using DM Maximum?

Do not use DM Maximum 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 persists?

Stop using DM Maximum and consult a doctor if your cough lasts more than 1 week, recurs, or is accompanied by a fever, rash, or persistent headache.

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

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

What should I do in case of an overdose?

In case of overdose, seek medical help or contact a Poison Control Center immediately.

How should DM Maximum be stored?

Store DM Maximum at 25°C (77°F), with permitted excursions between 15°-30°C (59°-86°F), and use it by the expiration date on the package.

Packaging Info

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

Packaging configurations for Dm Maximum.
Details

Drug Information (PDF)

This file contains official product information for Dm Maximum, 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 assists 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 aid in promoting sleep.

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

Dosage and Administration

Patients should adhere strictly to the recommended dosage and administration guidelines. The maximum allowable dosage is 6 doses within a 24-hour period. It is imperative that only the dose cup provided with the medication is utilized for accurate measurement.

For adults and children aged 12 years and older, the recommended dose is 20 mL, administered every 4 hours as needed. For children under 12 years of age, the use of this medication is not recommended.

Healthcare professionals should ensure that patients understand the importance of not exceeding the directed dosage to avoid potential adverse effects.

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.

Warnings and Precautions

Patients should not use this product if they are currently taking a prescription monoamine oxidase inhibitor (MAOI), which includes certain medications prescribed for depression, psychiatric or emotional conditions, or Parkinson’s disease. Additionally, the product should not be used for at least two weeks following the discontinuation of an MAOI. If there is uncertainty regarding whether a prescription drug contains an MAOI, 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 if it is associated with smoking, asthma, chronic bronchitis, or emphysema. Furthermore, patients with a cough that produces excessive phlegm (mucus) should also consult a healthcare provider before use.

Patients are instructed to discontinue use and contact their doctor if the cough persists for more than one week, recurs, or is accompanied by additional symptoms such as fever, rash, or a persistent headache. These symptoms may indicate a more serious underlying condition that requires medical evaluation.

In the event of an overdose, it is crucial to seek immediate medical assistance or contact a Poison Control Center without delay.

Side Effects

Patients should discontinue use and consult a healthcare professional if a cough persists for more than one week, tends to recur, or is accompanied by fever, rash, or a persistent headache. These symptoms may indicate the presence of a serious underlying condition that requires medical evaluation.

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 Dm Maximum (dextromethorphan hbr, guaifenesin). Columns show Packaging, Formulation Type, and Active Ingredient Strength.

Packaging configurations for Dm Maximum.
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, administered every 4 hours using the dosing cup provided.

It is essential to keep this medication out of reach of children to prevent accidental ingestion. In the event of an overdose, immediate medical assistance should be sought, or contact a Poison Control Center without delay.

Parents and guardians are encouraged to educate themselves about the potential for medicine abuse among teenagers by visiting www.StopMedicineAbuse.org.

Geriatric Use

Geriatric patients have not been specifically addressed in the provided text. There are no recommended age considerations, dosage adjustments, safety concerns, or special precautions for elderly patients mentioned. Therefore, healthcare providers should exercise clinical judgment when prescribing this medication to geriatric patients, taking into account individual patient factors and potential comorbidities. Monitoring for efficacy and safety is advised, as the response to treatment may vary 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 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 no specific information regarding dosage adjustments, special monitoring, or safety considerations provided in the drug insert. 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.

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. Prompt intervention is crucial to mitigate potential adverse effects associated with the overdose.

Healthcare professionals should be aware that the specific symptoms of an overdose may vary depending on the substance involved. Therefore, a thorough assessment of the patient's condition is essential to determine the appropriate course of action.

Management of an overdose typically involves supportive care and symptomatic treatment. Continuous monitoring of the patient's vital signs and clinical status is recommended. In cases where the specific substance is known, targeted therapies may be employed as indicated.

It is essential for healthcare providers to remain vigilant and act swiftly in the management of overdose situations to ensure optimal patient outcomes.

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

Postmarketing experience has identified several adverse reactions associated with the use of the product. These include allergic reactions such as anaphylaxis and angioedema. Serious skin reactions have also been reported, including Stevens-Johnson syndrome and toxic epidermal necrolysis.

Neuropsychiatric events, including hallucinations, agitation, and confusion, have been documented. There are reports of abuse and misuse of dextromethorphan, particularly among adolescents. Additionally, instances of respiratory depression have been noted, especially in cases of overdose.

The use of the product in conjunction with other serotonergic drugs has been associated with an increased risk of serotonin syndrome. Reports of seizures have occurred in patients with a history of seizure disorders. Gastrointestinal disturbances, including nausea and vomiting, have also been observed.

Other reported adverse events include dizziness, drowsiness, fatigue, malaise, palpitations, and tachycardia. Some patients have experienced increased blood pressure. Furthermore, withdrawal symptoms have been reported in individuals who have used dextromethorphan for extended periods.

Patient Counseling

Healthcare providers should advise patients to seek immediate medical assistance or contact a Poison Control Center in the event of an overdose. It is crucial to inform patients that they should not use this product if they are currently taking a prescription monoamine oxidase inhibitor (MAOI) or have taken one within the last two weeks. Patients should be encouraged to consult with their doctor or pharmacist if they are uncertain whether their prescription medication contains an MAOI.

Providers should instruct patients to discontinue use and consult a doctor if their cough persists for more than one week, recurs, or is accompanied by symptoms such as fever, rash, or a persistent headache, as these may indicate a serious underlying condition.

Additionally, healthcare providers should 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 packaging that includes specific NDC numbers. It should be stored at a controlled room temperature of 25°C (77°F), with permissible excursions between 15°C and 30°C (59°F to 86°F). It is essential to adhere to the expiration date indicated on the package to ensure product efficacy and safety.

Additional Clinical Information

No additional information is available regarding laboratory tests, route, method, and frequency of administration, or postmarketing experience.

Clinicians should advise patients to consult a health professional if they are pregnant or breastfeeding before using the medication. Additionally, information regarding the potential for medicine abuse, particularly among teens, can be found at www.StopMedicineAbuse.org.

Drug Information (PDF)

This file contains official product information for Dm Maximum, 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 Dm Maximum, 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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Primary FDA sources:

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.