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Fast Acting Mucus Relief

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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
Liquid
Route
Oral
Prescription status
OTC (over the counter)
Marketed in the U.S.
Since 2014
Label revision date
November 11, 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
Liquid
Route
Oral
Prescription status
OTC (over the counter)
CSA schedule
Not a scheduled drug
Marketed in the U.S.
Since 2014
Label revision date
November 11, 2025
Manufacturer
Dolgencorp, Inc. (DOLLAR GENERAL & REXALL)
Registration number
M012
NDC root
55910-037

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

Drug Overview

This medication is designed to help you manage symptoms associated with cough and nasal congestion, particularly during a cold or when exposed to irritants. It works by loosening phlegm (mucus) and thinning bronchial secretions, making it easier to clear your airways and produce a more effective cough. Additionally, it temporarily relieves minor throat and bronchial irritation, reduces the urge to cough, and alleviates nasal congestion.

The formula includes key ingredients such as Dextromethorphan HBr, which acts as a cough suppressant, Guaifenesin, an expectorant that helps clear mucus, and Phenylephrine HCl, a nasal decongestant. This combination provides fast-acting, maximum strength relief for those aged 12 and over, helping you feel more comfortable and allowing for better rest.

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 cough 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 the urge to cough, making it easier for you to get to sleep. Additionally, it can relieve nasal congestion associated with a cold, helping you feel more comfortable.

Dosage and Administration

When using this medication, it's important to follow the dosing instructions carefully to ensure your safety and effectiveness. For adults and children aged 12 years and older, you should take 20 milliliters (mL) using the dosing cup provided every 4 hours. Make sure to shake the bottle well before each use to mix the medication properly.

You should not take more than 6 doses within a 24-hour period, and it's crucial to only use the dosing cup that comes with the product—do not use any other measuring device. 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. Always keep the dosing cup with the product for easy access.

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. It's important to wait at least two weeks after stopping an MAOI before using this product. If you're unsure whether your medication contains an MAOI, please consult your doctor or pharmacist for guidance.

Side Effects

If you experience nervousness, dizziness, or trouble sleeping while using this medication, it's important to stop taking it and consult your doctor. Additionally, if your symptoms do not improve within 7 days, or if they are accompanied by a fever, you should seek medical advice. A returning cough, especially if it comes with a rash or a persistent headache, may indicate a more serious condition, and you should also reach out to your healthcare provider in that case.

Warnings and Precautions

You should not use this medication if you are under 12 years old or if you are currently taking a prescription monoamine oxidase inhibitor (MAOI), which is a type of medication for depression or certain other conditions. 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.

Before using this medication, it's important to talk to your doctor if you have any of the following conditions: heart disease, thyroid disease, diabetes, high blood pressure, difficulty urinating due to an enlarged prostate, or a chronic cough related to smoking, asthma, or other lung issues. If you experience an overdose, seek emergency 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 you experience nervousness, dizziness, or sleeplessness, if your symptoms do not improve within 7 days or are accompanied by a fever, or if your cough returns with a rash or persistent headache, as these may indicate a more serious 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 err on the side of caution—if you notice any concerning symptoms or if you’re unsure, don’t hesitate to get help right away. 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 is important to note that this medication should not be used in children under 12 years of age. If you are a parent or caregiver, please ensure that your child meets this age requirement before considering this treatment. Always consult with a healthcare professional if you have any questions or concerns about the appropriate use of this medication for your child.

Geriatric Use

While there is no specific information available about the use of this medication in older adults, it’s important to approach any new treatment with caution. If you or a loved one is an older adult, it’s wise to discuss any potential risks or benefits with your healthcare provider. They can help determine the best course of action based on individual health needs and any other medications being taken.

Always keep in mind that older adults may have different responses to medications, so regular check-ins with your doctor can ensure safety and effectiveness.

Renal Impairment

If you have kidney problems, it's important to know that the drug insert does not provide specific information about dosage adjustments, special monitoring, or safety considerations for your condition. This means that there are no tailored guidelines for how this medication may affect you if you have renal impairment (kidney issues).

Always consult your healthcare provider for personalized advice and to ensure that any medication you take is safe and appropriate for your health situation. They can help monitor your kidney function and make any necessary adjustments to your treatment plan.

Hepatic Impairment

If you have liver problems, it's important to know that the drug insert does not provide specific information about dosage adjustments, special monitoring, or precautions for your condition. This means that there are no tailored guidelines for how this medication may affect you differently due to your liver health.

Always consult your healthcare provider for personalized advice and to discuss any concerns you may have regarding your liver condition and the use of this medication. They can help ensure that you receive the safest and most effective treatment.

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 room temperature, specifically between 20-25ºC (68-77ºF). It's important to avoid refrigeration, as this can affect its effectiveness.

When handling the product, make sure to do so in a clean environment to maintain its integrity. Always follow any additional safety guidelines 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 and older, the recommended dose is 20 mL every 4 hours, but do not exceed 6 doses in a 24-hour period. If you are pregnant or breastfeeding, consult a healthcare professional before using this medication.

It's important to keep this medicine out of reach of children. In case of an overdose, seek medical help immediately or contact a Poison Control Center at 1-800-222-1222.

FAQ

What is the general purpose of this medication?

This medication helps loosen phlegm (mucus) and thin bronchial secretions to make coughs more productive.

What symptoms does this medication temporarily relieve?

It temporarily relieves cough due to minor throat and bronchial irritation, reduces the intensity of coughing, decreases the impulse to cough to help you sleep, and alleviates nasal congestion due to a cold.

Who should not use this medication?

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

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

The recommended dosage is 20 mL every 4 hours, not to exceed 6 doses in a 24-hour period.

What should I do if I experience side effects?

Stop use and ask a doctor if you experience nervousness, dizziness, sleeplessness, or if symptoms do not improve within 7 days.

What should I do in case of overdose?

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

Is it safe to use this medication if I am pregnant or breastfeeding?

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

How should I store this medication?

Store the medication between 20-25ºC (68-77ºF) and do not refrigerate.

Packaging Info

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

Packaging configurations for Fast Acting Mucus Relief.
Details

Drug Information (PDF)

This file contains official product information for Fast Acting Mucus Relief, 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 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 relieves the intensity of coughing and the impulse to cough, which may aid in achieving restful sleep. It also alleviates nasal congestion associated with colds.

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

Dosage and Administration

Healthcare professionals should advise patients to adhere to the following dosage and administration guidelines.

For adults and children aged 12 years and older, the recommended dose is 20 mL, to be measured using the dosing cup provided, every 4 hours as needed. It is imperative that no more than 6 doses are taken within a 24-hour period.

For optimal results, the product must be shaken well before each use. The dosing cup should be kept with the product to ensure accurate measurement, and no other dosing devices should be utilized.

Children under 12 years of age should not use this product.

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. Due to the potential for serious interactions, it is advised to consult a healthcare professional if there is uncertainty regarding the presence of an MAOI in any prescription medication.

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, consultation with a healthcare professional is advised prior to use.

Healthcare professionals should exercise caution and recommend that patients consult a physician before using this product if they have any of the following conditions: heart disease, thyroid disease, diabetes, high blood pressure, difficulty urinating due to an enlarged prostate gland, or a persistent or chronic cough associated with smoking, asthma, chronic bronchitis, or emphysema. Furthermore, patients with a cough that produces excessive phlegm (mucus) should also seek medical advice prior to use.

In the event of an overdose, immediate medical assistance should be sought, or the Poison Control Center (1-800-222-1222) should be contacted without delay.

Patients are advised to discontinue use and consult a healthcare provider 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 recurs or is associated with a rash or persistent headache, 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 are accompanied by fever, medical advice should be sought. A return of cough, particularly if it is associated with a rash or persistent headache, may indicate a serious condition and warrants immediate evaluation by a physician.

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 Fast Acting Mucus Relief (dextromethorphan hydrobromide, guaifenesin, phenylephrine hydrochloride). Columns show Packaging, Formulation Type, and Active Ingredient Strength.

Packaging configurations for Fast Acting Mucus Relief.
Details

Pediatric Use

Pediatric patients under 12 years of age should not be administered this medication. There are no established safety or efficacy profiles for this age group, and its use is contraindicated in children younger than 12 years.

Geriatric Use

There is no specific information available 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 individual responses may vary. It is advisable to monitor these patients closely for any adverse effects or changes in efficacy.

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 drug 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 established dosage adjustments, special monitoring requirements, or precautions outlined for individuals with compromised liver function. It is recommended that healthcare providers exercise caution when prescribing this medication to patients with hepatic impairment, given the lack of data on its safety and efficacy in this population. Regular monitoring of liver function may be prudent in these cases, although specific parameters are not defined in the prescribing information.

Overdosage

In the event of an overdose, it is imperative to seek immediate medical assistance. Healthcare professionals are advised to contact a Poison Control Center at 1-800-222-1222 for guidance on managing the situation effectively.

Prompt intervention is crucial to mitigate potential adverse effects associated with an overdose. Symptoms may vary depending on the substance involved, and healthcare providers should be prepared to assess and manage these symptoms accordingly.

Management procedures may include supportive care and symptomatic treatment, tailored to the specific clinical presentation of the patient. Continuous monitoring and evaluation are essential to ensure patient safety and to address any complications that may arise during the course of treatment.

Nonclinical Toxicology

If pregnant or breastfeeding, it is advised to consult a health professional prior to use. No specific non-teratogenic effects have been identified in the available data. Additionally, there are no detailed findings regarding nonclinical toxicology or animal pharmacology and toxicology provided in the current information.

Postmarketing Experience

Postmarketing experience has identified the following adverse reactions: nervousness, dizziness, and sleeplessness. Additionally, it is noted that symptoms persisting beyond 7 days, or those accompanied by fever, a returning cough, rash, or persistent headache, may indicate the presence of a serious condition.

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 should be instructed to discontinue use and consult a healthcare professional if they experience nervousness, dizziness, or sleeplessness. Additionally, they should be advised to stop using the product and seek medical advice if their symptoms do not improve within 7 days or if they experience symptoms accompanied by fever. Patients should also be informed that they should stop use and consult a doctor if their cough returns or is associated with a rash or persistent headache, as these may indicate a serious condition.

When using this product, patients must be reminded not to exceed the recommended dosage. Healthcare providers should encourage patients to consult a doctor before use if they have any of the following conditions: heart disease, thyroid disease, diabetes, high blood pressure, or difficulty urinating due to an enlarged prostate gland. Furthermore, patients with a persistent or chronic cough, such as that associated with smoking, asthma, chronic bronchitis, or emphysema, should also seek medical advice prior to use. Lastly, patients should be advised to consult a healthcare professional 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 20-25ºC (68-77ºF). Refrigeration is not recommended, as it may compromise the integrity of the product. Proper storage conditions must be maintained to ensure optimal 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. Patients should not exceed 6 doses within a 24-hour period.

Clinicians should advise patients who are pregnant or breastfeeding to consult a health professional prior to use. It is crucial to keep the medication out of reach of children, and in the event of an overdose, patients should seek medical assistance or contact a Poison Control Center immediately at 1-800-222-1222.

Drug Information (PDF)

This file contains official product information for Fast Acting Mucus Relief, 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 Fast Acting Mucus Relief, 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.