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DayQuil Mucus Control DM

Generic name: dextromethorphan and guaifenesin

Brand names: Alka-Seltzer Plus Maximum Strength, Children Giltuss Cough and Chest Congestion, Children's Delsym Cough+Chest Congest DM, Children's Robitussin Cough and Chest Congestion DM, Coricidin HBP Chest Congestion and Cough, Delsym Cough Plus Chest Congestion DM, Diabetic Tuss DM Maximum Strength, Fenesin DM IR, Geri-Tussin DM, Giltuss Cough and Chest Congestion, Giltuss Diabetic Cough and Cold, Guaiasorb DM, G-Zyncof, Kindermed Kids' Cough and Congestion, Max Tussin Cough + Chest Congestion DM, Max Tu

Used for common cold
Last updated November 2, 2026 0 views
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What is DayQuil Mucus Control DM?

DayQuil Mucus Control DM is a combination medicine that helps relieve cough and chest congestion caused by allergies, the common cold, or the flu.

DayQuil Mucus Control DM may also be used for other reasons not mentioned in this medication guide.

This section was rewritten for readability and reviewed for meaning.

How should I take DayQuil Mucus Control DM?

Use exactly as directed on the label, or as prescribed by your doctor. Cold or cough medicine is only for short-term use.

Your dose may change if you switch to a different brand, strength, or form of this medicine. Avoid medication errors by using exactly as directed on the label, or as prescribed by your doctor.

Do not give this medicine to a child without medical advice. Follow all directions when giving this medicine to a child. Do not use the medicine to make a child sleepy. Misuse of this medicine may cause death in very young children.

Measure liquid medicine with the supplied measuring device (not a kitchen spoon).

You may need to shake the liquid before you measure a dose. Follow all directions on the label.

Swallow the extended-release tablet whole and do not crush, chew, or break it.

Dissolve the effervescent tablets in at least 4 ounces of water. Stir and drink right away. Add more water to the glass, swirl and drink.

Sprinkle the granules directly onto your tongue and swallow right away.

Drink extra fluids to help loosen the congestion and lubricate your throat while you are taking this medicine.

Call your doctor if your symptoms do not improve after 7 days, or if you have a fever, rash, or headaches.

Follow the storage instructions provided with this medicine. Your pharmacist can provide more information about how to store this medicine.

This section was rewritten for readability and reviewed for meaning.

Warnings

Do not use this medicine if you are currently using or have used an MAO inhibitor in the last 14 days. A dangerous drug interaction could happen. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, and tranylcypromine.

This section was rewritten for readability and reviewed for meaning.

Before taking this medicine

You should not take DayQuil Mucus Control DM if you are allergic to it.

Do not use DayQuil Mucus Control DM if you are taking or have taken an MAO inhibitor in the last 14 days. A dangerous interaction with the drug could happen. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, and tranylcypromine.

Ask a doctor or pharmacist if this medicine is safe to use if you have:

  • a cough with mucus; or
  • asthma, emphysema, or chronic bronchitis.

This medicine may contain phenylalanine and could be harmful if you have phenylketonuria (PKU).

Ask a doctor before using this medicine if you are pregnant or breastfeeding.

This section was rewritten for readability and reviewed for meaning.

DayQuil Mucus Control DM side effects

Get emergency medical help if you notice signs of an allergic reaction: hives, trouble breathing, swelling of your face, lips, tongue, or throat.

DayQuil Mucus Control DM can cause serious side effects. Stop using DayQuil Mucus Control DM and contact your doctor immediately if you experience:

  • mood changes;
  • severe headache; or
  • severe dizziness or anxiety, feeling like you might faint.

Common side effects of DayQuil Mucus Control DM may include:

  • dizziness, drowsiness;
  • trouble sleeping (insomnia);
  • diarrhea; or
  • feeling nervous, restless, anxious, or irritable.

This is not a complete list of side effects and others may happen. Contact your doctor for medical advice about side effects. You can report side effects to the FDA at 1-800-FDA-1088.

This section was rewritten for readability and reviewed for meaning.

What happens if I miss a dose?

DayQuil Mucus Control DM can be taken as needed. If you are following a dosing schedule and miss a dose, skip it. Do not take two doses at once.

This section was rewritten for readability and reviewed for meaning.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

  • Avoid driving or hazardous activity until you know how DayQuil Mucus Control DM will affect you. Your reactions could be impaired.
  • Ask a doctor or pharmacist before taking other cough or cold medicines that may contain similar ingredients.
  • Drinking alcohol with this medicine can cause side effects.

This section was rewritten for readability and reviewed for meaning.

What other drugs will affect DayQuil Mucus Control DM?

Ask a doctor or pharmacist before using any other medicines that can make you sleepy (like opioid medication, sleep medicine, a muscle relaxer, or medicine for anxiety or seizures). Inform your doctor about all other medicines you are taking. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed here.

This section was rewritten for readability and reviewed for meaning.

Related medicines

Before you take this medicine: the information on this page is general and may not cover your personal circumstances. Read the label supplied with your medicine and ask a pharmacist or doctor if you are unsure, especially if you are pregnant, breastfeeding, taking other medicines or managing a long-term condition.
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Content is provided for education and is not medical advice. See our medical disclaimer.