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G-P-Tuss DXP

Generic name: dexbrompheniramine, dextromethorphan, and phenylephrine

Brand names: Alahist CF, Brantussin DM, Panatuss Pediatric DXP, Supress A Pediatric, G-P-Tuss DXP, Panatuss DXP

Last updated November 2, 2026 0 views
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What is G-P-Tuss DXP?

Dexbrompheniramine is an antihistamine that lowers the effects of the body's natural chemical histamine. Histamine can cause symptoms like sneezing, itching, watery eyes, and a runny nose.

Dextromethorphan is a cough suppressant. It affects the signals in the brain that cause the cough reflex.

Phenylephrine is a decongestant that narrows blood vessels in the nasal passages. Enlarged blood vessels can lead to nasal congestion (a stuffy nose).

G-P-Tuss DXP is a combination medicine used to relieve runny or stuffy nose, sneezing, itching, watery eyes, cough, and sinus congestion caused by allergies, the common cold, or the flu.

G-P-Tuss DXP will not treat a cough caused by smoking, asthma, or emphysema.

G-P-Tuss DXP may also be used for other purposes not mentioned in this medication guide.

This section was rewritten for readability and reviewed for meaning.

How should I take G-P-Tuss DXP?

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 the directions on the medicine label regarding giving cough or cold medicine to a child. Do not use the medicine solely 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 a medicine dose-measuring device (not a kitchen spoon).

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

If you need surgery or medical tests, inform the surgeon or doctor if you have taken a cough or cold medicine in the past few days.

Store at room temperature away from moisture and heat. Do not freeze.

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Warnings

Do not use G-P-Tuss DXP if you have taken an MAO inhibitor in the last 14 days, such as isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, or tranylcypromine.

Do not use cough or cold medicine to try to make a child sleepy.

This section was rewritten for readability and reviewed for meaning.

Before taking this medicine

You should not use this medicine if you are allergic to dexbrompheniramine, dextromethorphan, or phenylephrine.

Do not use cough or cold medicine if you have taken an MAO inhibitor in the past 14 days. A dangerous drug interaction could happen. MAO inhibitors include furazolidone, isocarboxazid, linezolid, phenelzine, rasagiline, selegiline, and tranylcypromine.

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

  • asthma or COPD;
  • a cough with mucus, or a cough caused by chronic bronchitis;
  • a blockage in your stomach or intestines;
  • glaucoma;
  • liver or kidney disease;
  • diabetes;
  • heart disease, high blood pressure;
  • a thyroid disorder; or
  • urination problems.

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

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

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G-P-Tuss DXP side effects

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

This medicine may cause serious side effects. Stop using this medicine and call your doctor right away if you have:

  • fast, pounding, or irregular heartbeats;
  • shortness of breath;
  • severe dizziness or nervousness;
  • little or no urination;
  • trouble sleeping; or
  • increased blood pressure--severe headache, blurred vision, pounding in your neck or ears, anxiety, nosebleed.

Common side effects of G-P-Tuss DXP may include:

  • flushing (warmth, redness, or tingling feeling);
  • dry mouth, nose, or throat;
  • feeling nervous, restless, or irritable;
  • dizziness, drowsiness;
  • feeling restless or excited (especially in children);
  • loss of appetite;
  • blurred vision; or
  • sleep problems (insomnia).

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 the FDA at 1-800-FDA-1088.

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What happens if I miss a dose?

Since G-P-Tuss DXP is taken as needed, you might not follow a set dosing schedule. If you miss a dose and it's almost time for your next dose, just skip the missed dose. Do not take two doses at the same time.

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What happens if I overdose?

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

Drinking alcohol with G-P-Tuss DXP can lead to side effects.

Talk to a doctor or pharmacist before using other cough or cold medicines that might have similar ingredients.

Do not drive or engage in hazardous activities until you know how this medicine will affect you. Your reactions could be impaired.

This section was rewritten for readability and reviewed for meaning.

What other drugs will affect G-P-Tuss DXP?

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 any other medication, including prescription and over-the-counter medicines, vitamins, and herbal products.

Not all possible drug interactions are listed in this medication guide.

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.