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Home Knowledge Center Wellness Library dextromethorphan and guaifenesin

dextromethorphan and guaifenesin

Pronunciation: DEX troe me THOR fan and gwye FEN e sin

Brand: Aquatab DM, Broncotron, Coricidin HBP Chest Congestion & Cough, DayQuil Mucus Control DM, Delsym Cough Plus Chest Congestion DM, Fenesin DM IR, G-Zyncof, Mucinex DM, Phlemex, Robitussin Cough + Chest Congestion DM, Safetussin DM, Siltussin DM, TabTussin DM, Tussin DM, Zyncof

Mucinex DM

slide 1 of 3, Mucinex DM,

30 mg-600 mg, oval, white, imprinted with Mucinex 600

Image of Mucinex DM
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Fenesin DM

slide 2 of 3, Fenesin DM,

30 mg-600 mg, oblong, gray, imprinted with DU RA, FDM 014

Image of Fenesin DM
slide 2 of 3

Guaifenex DM

slide 3 of 3, Guaifenex DM,

30 mg-600 mg, oblong, green, imprinted with 213, ETHEX

Image of Guaifenex DM
slide 3 of 3
What is the most important information I should know about dextromethorphan and guaifenesin?

What is the most important information I should know about dextromethorphan and guaifenesin?

Do not use this medicine if you have used an MAO inhibitor in the past 14 days, such as isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, or tranylcypromine.

What is dextromethorphan and guaifenesin?

What is dextromethorphan and guaifenesin?

Dextromethorphan is a cough suppressant. Guaifenesin is an expectorant.

Dextromethorphan and guaifenesin is a combination medicine used to treat cough and chest congestion caused by the common cold or allergies.

Dextromethorphan will not treat a cough that is caused by smoking.

There are many brands and forms of this medication available and not all brands are listed on this leaflet.

Dextromethorphan and guaifenesin may also be used for purposes not listed in this medication guide.

What should I discuss with my healthcare provider before taking dextromethorphan and guaifenesin?

What should I discuss with my healthcare provider before taking dextromethorphan and guaifenesin?

Do not use this medicine if you have taken an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, 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.

Ask a doctor before using this medicine if you are pregnant or breast-feeding.

This medicine may contain phenylalanine. Check the medication label if you have phenylketonuria (PKU).

How should I take dextromethorphan and guaifenesin?

How should I take dextromethorphan and guaifenesin?

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

Always follow directions on the medicine label about giving cough or cold medicine to a child. Do not use the medicine only to make a child sleepy. Death can occur from the misuse of cough or cold medicines in very young children.

Measure liquid medicine carefully. Use the dosing syringe provided, or use a medicine dose-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.

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.

If you need to have any type of surgery, tell the surgeon ahead of time if you have taken this medicine within the past few days.

Store at room temperature away from moisture and heat.

What happens if I miss a dose?

What happens if I miss a dose?

Since dextromethorphan and guaifenesin is used when needed, you may not be on a dosing schedule. Skip any missed dose if it's almost time for your next dose. Do not use two doses at one time.

What happens if I overdose?

What happens if I overdose?

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

What should I avoid while taking dextromethorphan and guaifenesin?

What should I avoid while taking dextromethorphan and guaifenesin?

Avoid driving or hazardous activity until you know how this medicine will affect you. Your reactions could be impaired.

Drinking alcohol with this medicine can cause side effects.

Ask a doctor or pharmacist before using other cough or cold medicines that may contain similar ingredients.

What are the possible side effects of dextromethorphan and guaifenesin?

What are the possible side effects of dextromethorphan and guaifenesin?

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

Stop using this medicine and call your doctor at once if you have:

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

Common side effects may include:

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

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

What other drugs will affect dextromethorphan and guaifenesin?

What other drugs will affect dextromethorphan and guaifenesin?

Avoid using this medicine with other drugs that cause drowsiness or slow your breathing (such as opioid medicine, a muscle relaxer, or medicine for anxiety or seizures).

Ask a doctor or pharmacist before using this medicine if you are also using any other drugs, including prescription and over-the-counter medicines, vitamins, and herbal products. Some medicines can cause unwanted or dangerous effects when used together. Not all possible interactions are listed in this medication guide.

Where can I get more information?

Where can I get more information?

Your pharmacist can provide more information about dextromethorphan and guaifenesin.

This information does not replace the advice of a doctor. Healthwise, Incorporated, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.

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