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Mucinex Fast-Max

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Active ingredients
  • Guaifenesin 400 mg/20 mL
  • Dextromethorphan Hydrobromide 20 mg/20 mL
  • Phenylephrine Hydrochloride 10 mg/20 mL
Other brand names
Drug classes
Expectorant, Sigma-1 Agonist, Uncompetitive N-methyl-D-aspartate Receptor Antagonist, alpha-1 Adrenergic Agonist
Dosage form
Solution
Route
Oral
Prescription status
OTC (over the counter)
Marketed in the U.S.
Since 2017
Label revision date
July 29, 2025
Active ingredients
  • Guaifenesin 400 mg/20 mL
  • Dextromethorphan Hydrobromide 20 mg/20 mL
  • Phenylephrine Hydrochloride 10 mg/20 mL
Other brand names
Drug classes
Expectorant, Sigma-1 Agonist, Uncompetitive N-methyl-D-aspartate Receptor Antagonist, alpha-1 Adrenergic Agonist
Dosage form
Solution
Route
Oral
Prescription status
OTC (over the counter)
CSA schedule
Not a scheduled drug
Marketed in the U.S.
Since 2017
Label revision date
July 29, 2025
Manufacturer
RB Health (US) LLC
Registration number
M012
NDC root
63824-540

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Drug Overview

Mucinex® is a medication designed to help you manage symptoms associated with colds and respiratory issues. It contains three active ingredients: guaifenesin, which is an expectorant that helps loosen phlegm (mucus) and thin bronchial secretions, making coughs more productive; dextromethorphan HBr, a cough suppressant that reduces the urge to cough; and phenylephrine HCl, a nasal decongestant that alleviates nasal congestion.

This medication is intended for individuals aged 12 and older and provides temporary relief from cough due to minor throat and bronchial irritation, as well as nasal and chest congestion. By thinning and loosening mucus, Mucinex® helps clear your airways, making it easier to breathe 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 also use this medication to temporarily relieve coughs caused by minor throat and bronchial irritation, which can happen with the common cold or from inhaling irritants. It can help reduce the intensity of your cough and lessen the urge to cough, making it easier for you to get to sleep. Additionally, it can relieve nasal congestion associated with a cold.

Dosage and Administration

It's important to follow the correct dosage when taking this medication to ensure your safety and effectiveness. For adults and children aged 12 years and older, you should take 20 mL using the dosing cup provided every 4 hours. Make sure to measure the dose accurately with the dosing cup that comes with the medication, as using a different cup could lead to incorrect dosing.

You should not take more than 6 doses within a 24-hour period. If you have children under 12 years of age, this medication is not recommended for them. Always follow your doctor's instructions if they provide specific guidance on your dosage.

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, do not use this product for at least two weeks after stopping an MAOI. 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. Do not take more than the recommended amount, as misuse can lead to serious health issues. Always prioritize your safety and well-being when using any medication.

Side Effects

If you experience nervousness, dizziness, or sleeplessness while using this medication, it's important to stop using it and consult your doctor. Additionally, if your symptoms do not improve within 7 days, or if you develop a fever, you should seek medical advice. A cough that lasts more than 7 days, returns, or is accompanied by fever, rash, or a persistent headache may indicate a more serious condition, and you should contact your healthcare provider.

Warnings and Precautions

You should not use this product if you are currently taking a prescription monoamine oxidase inhibitor (MAOI) for depression, psychiatric conditions, or Parkinson's disease, 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, it's important to talk to your doctor if you have any of the following conditions: heart disease, high blood pressure, thyroid disease, diabetes, difficulty urinating due to an enlarged prostate, or a chronic cough related to smoking, asthma, chronic bronchitis, or emphysema. If you experience an overdose, seek emergency medical help or contact a Poison Control Center immediately.

You should stop using this product and call your doctor if you experience nervousness, dizziness, or sleeplessness, if your symptoms do not improve within 7 days, or if your cough lasts more than 7 days, returns, or is accompanied by fever, rash, or a persistent headache. These could indicate a more serious health issue.

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 what you would typically experience with the medication.

Don’t wait to see if symptoms improve; prompt action can be vital. Always keep emergency contact information handy and be aware of the signs that indicate you need urgent 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 4 hours, using the dosing cup provided.

Always keep this medication out of reach of children to prevent accidental ingestion. In the event of an overdose, seek medical help immediately or contact a Poison Control Center for assistance.

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 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 information provided does not include specific guidelines for dosage adjustments, special monitoring, or safety considerations related to renal impairment (kidney issues). This means that there are no tailored recommendations for how your treatment may need to change based on your kidney function.

Always consult your healthcare provider for personalized advice and to ensure that your treatment is safe and effective, especially if you have any concerns about your kidney health. They can provide the necessary guidance based on your individual situation.

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).

Always consult your healthcare provider for personalized advice and to ensure that any medication you take is safe and appropriate for your liver health. They can help determine the best course of action based on your individual situation.

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, 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 and well-being are the top priority, so don't hesitate to ask questions about your treatments.

Storage and Handling

To ensure the best performance of your product, store it at room temperature, specifically between 20-25°C (68-77°F). It's important to avoid refrigeration, as this can affect the product's effectiveness.

When handling the product, make sure to do so in a clean environment to maintain its integrity. Always follow any additional safety instructions provided with the product to ensure safe and effective use.

Additional Information

You should take this medication orally, using the dosing cup provided. For adults and children aged 12 years and older, the recommended dose is 20 mL every 4 hours. However, this medication is not recommended for children under 12 years of age. If you have any questions about your dosage or how to take the medication, be sure to consult your healthcare provider.

FAQ

What is Mucinex® used for?

Mucinex® helps loosen phlegm (mucus) and thin bronchial secretions, making coughs more productive. It temporarily relieves cough due to minor throat and bronchial irritation, as well as nasal congestion due to a cold.

Who can use Mucinex®?

Mucinex® is for adults and children aged 12 and older. Children under 12 years of age should not use this product.

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

The recommended dosage is 20 mL in the dosing cup provided every 4 hours, but do not take more than 6 doses in any 24-hour period.

Are there any contraindications for using Mucinex®?

Do not use Mucinex® if you are currently taking a prescription monoamine oxidase inhibitor (MAOI) or for 2 weeks after stopping an MAOI. Consult a doctor or pharmacist if unsure.

What should I do if I experience side effects?

Stop using Mucinex® and consult a doctor if you experience nervousness, dizziness, sleeplessness, or if symptoms do not improve within 7 days.

Can I use Mucinex® if I am pregnant or breastfeeding?

If you are pregnant or breastfeeding, ask a health professional before using Mucinex®.

How should I store Mucinex®?

Store Mucinex® between 20-25°C (68-77°F) and do not refrigerate.

What should I do in case of an overdose?

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

Packaging Info

Below are the non-prescription pack sizes of Mucinex Fast-Max (dextromethorphan hydrobromide, guaifenesin, and phenylephrine hydrochloride). Columns show Packaging, Formulation Type, and Active Ingredient Strength.

Packaging configurations for Mucinex Fast-Max.
Details

Drug Information (PDF)

This file contains official product information for Mucinex Fast-Max, including active ingredients, dosage, warnings, and labeling as submitted by the manufacturer for OTC distribution.

View product document (PDF)

Description

Mucinex® FAST-MAX is a combination medication formulated to address multiple symptoms associated with respiratory conditions. It contains three active ingredients: Dextromethorphan HBr, which serves as a cough suppressant; Guaifenesin, an expectorant that thins and loosens mucus; and Phenylephrine HCl, a nasal decongestant that relieves nasal and chest congestion. This product is indicated for individuals aged 12 years and older. Mucinex® FAST-MAX is available in a liquid dosage form, packaged in a 6 FL OZ (180 mL) container.

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 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 help patients achieve restful sleep. It also alleviates nasal congestion associated with colds.

There are no teratogenic or nonteratogenic effects reported for this drug.

Dosage and Administration

The maximum recommended dosage is 6 doses within a 24-hour period. It is imperative that the dosing cup provided is used exclusively for measuring the medication and not for any other products.

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

Healthcare professionals should ensure that patients are instructed to adhere strictly to these guidelines to avoid potential overdose and ensure safe administration.

Contraindications

Use of this product is contraindicated in patients currently taking a prescription monoamine oxidase inhibitor (MAOI) or within 2 weeks of discontinuing an MAOI. 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 prior to use.

Additionally, the product should not be used in excess of the directed dosage.

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 there is uncertainty regarding the presence of an MAOI in their prescription medications.

General precautions should be taken prior to use. Patients are advised to seek medical consultation if they have any of the following conditions: heart disease, high blood pressure, thyroid disease, diabetes, difficulty urinating due to an enlarged prostate gland, or a persistent or chronic cough associated with smoking, asthma, chronic bronchitis, or emphysema. Furthermore, individuals experiencing a cough that produces excessive phlegm (mucus) should also consult a healthcare provider before use.

In the event of an overdose, immediate medical assistance should be sought, or the Poison Control Center should be contacted without delay.

Patients should discontinue use and consult a healthcare professional if they experience nervousness, dizziness, or sleeplessness. Additionally, if symptoms do not improve within seven days, or if they are accompanied by fever, or if a cough persists for more than seven days, recurs, or occurs with fever, rash, or a headache that lasts, these may indicate a serious condition requiring medical evaluation.

Side Effects

Patients should discontinue use and consult a healthcare professional if they experience nervousness, dizziness, or sleeplessness. Additionally, if symptoms do not improve within 7 days, or if they are accompanied by fever, it is advised to seek medical attention. A cough that persists for more than 7 days, recurs, or occurs alongside fever, rash, or a lasting headache may indicate a serious condition and warrants further evaluation.

Drug Interactions

The concomitant use of this product with monoamine oxidase inhibitors (MAOIs) is contraindicated. MAOIs are a class of medications commonly prescribed for depression, psychiatric disorders, or Parkinson's disease. Patients should not take this product while on MAOIs or within 2 weeks of discontinuing 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 includes an MAOI before initiating treatment with this product. This precaution is critical to avoid potential adverse effects associated with the interaction.

Packaging & NDC

Below are the non-prescription pack sizes of Mucinex Fast-Max (dextromethorphan hydrobromide, guaifenesin, and phenylephrine hydrochloride). Columns show Packaging, Formulation Type, and Active Ingredient Strength.

Packaging configurations for Mucinex Fast-Max.
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. In the event of an overdose, immediate medical assistance should be sought, or contact a Poison Control Center without delay.

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 elderly patients closely for any potential adverse effects or changes in therapeutic response, given the lack of targeted data for this population. Consideration of individual patient factors, including comorbidities and concurrent medications, is essential in managing treatment effectively.

Pregnancy

Pregnant patients and those who are breastfeeding should consult a healthcare professional prior to using this medication. It is important to assess the potential risks and benefits, as well as any available data regarding fetal outcomes and lactation. Healthcare providers can offer guidance tailored to individual circumstances, ensuring the safety of both the patient and the developing fetus or nursing infant.

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 addressed in the available prescribing information. There are no dosage adjustments, special monitoring requirements, or safety considerations outlined for individuals with reduced kidney function. Healthcare professionals should exercise caution and consider the lack of data when prescribing to this patient population.

Hepatic Impairment

Patients with hepatic impairment have not been specifically studied in clinical trials for 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 available 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 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

Reports of side effects have been received through voluntary submissions and surveillance programs. Patients and healthcare professionals are encouraged to report any adverse events associated with the use of the product to the designated contact number provided for this purpose.

Patient Counseling

Healthcare providers should advise patients to keep this product out of reach of children to prevent accidental ingestion. In the event of an overdose, patients should be instructed to seek medical help or contact a Poison Control Center immediately.

Patients should be informed that this product should not be used if they are currently taking a prescription monoamine oxidase inhibitor (MAOI) or within two weeks of stopping such medication. If patients are uncertain whether their prescription includes an MAOI, they should consult with their doctor or pharmacist prior to using this product.

Healthcare providers should counsel patients to discontinue use and consult a doctor if they experience nervousness, dizziness, or sleeplessness. Additionally, patients should be advised to stop using the product and seek medical advice if their symptoms do not improve within seven days, or if they experience symptoms accompanied by fever.

Patients should also be informed to stop use and consult a doctor if their cough persists for more than seven days, returns, or occurs with fever, rash, or a headache that lasts, as these may indicate a serious condition. It is important to emphasize that patients should not exceed the recommended dosage when using this product.

Before initiating treatment, healthcare providers should encourage patients to discuss their medical history, particularly if they have heart disease, high blood pressure, thyroid disease, diabetes, or difficulty urinating due to an enlarged prostate gland. Patients with a persistent or chronic cough, such as that associated with smoking, asthma, chronic bronchitis, or emphysema, should also consult a doctor before use. Furthermore, patients should be advised to seek medical advice if they have a cough that produces 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 temperature range of 20-25°C (68-77°F). Refrigeration is not recommended, as it may compromise the integrity of the product. Proper handling and storage conditions must be adhered to in order to maintain the product's efficacy and safety.

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. There is no additional information available regarding laboratory tests, abuse potential, patient counseling, or postmarketing experience.

Drug Information (PDF)

This file contains official product information for Mucinex Fast-Max, 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 Mucinex Fast-Max, retrieved by a validated AI data-extraction workflow.

All FDA-listed dosage forms and strengths are shown in the Packaging & NDC Codes section above. Regulatory status appears in the Summary Information panel above and was verified in the FDA National Drug Code directory and the NSDE NDC Directory daily file.

Note: an automated daemon monitors NSDE checksums; when the record for this NDC changes, the new file is pulled instantly and this page is refreshed.

No human clinician has reviewed this version.

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Orange Book data shown on this page are limited to Regulatory Status (Rx), Established Pharmacologic Class (EPC), and Mechanism of Action (MoA).

Regulatory data notice: Information on this page is reproduced verbatim from FDA public databases (NSDE, Orange Book, Purple Book, DailyMed SPL). NDA/ANDA drugs are FDA-approved, BLA biologics are FDA-licensed. Inclusion alone does not guarantee current market availability or imply FDA endorsement.

Medical disclaimer: This AI-generated content is provided for educational purposes only and does not constitute medical advice. Always consult a licensed healthcare professional for diagnosis or treatment decisions.