Phencarb GG



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Generic Name: carbetapentane, guaifenesin, and phenylephrine
(kar BET a PEN tane, gwye FEN e sin, and FEN il EFF rin)

What is Phencarb GG?

Carbetapentane is a cough suppressant. It affects the signals in the brain that trigger cough reflex.

Guaifenesin is an expectorant. It helps loosen mucus congestion in your chest and throat, making it easier to cough out through your mouth.

Phenylephrine is a decongestant that shrinks blood vessels in the nasal passages. Dilated blood vessels can cause nasal congestion (stuffy nose).

The combination of Phencarb GG is used to treat stuffy nose, cough, and chest congestion caused by the common cold or flu.

This medication will not treat a cough that is caused by smoking, asthma, or emphysema.

Phencarb GG may also be used to treat other conditions not listed in this medication guide.

What is the most important information I should know about Phencarb GG?

You should not use this medication if you are allergic to carbetapentane, guaifenesin, or phenylephrine.

Always ask a doctor before giving a cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.

Do not use a cough or cold medicine if you have used an MAO inhibitor such as isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam), or tranylcypromine (Parnate) within the past 14 days.

Before you take Phencarb GG, tell your doctor if you have asthma or other breathing disorder, heart disease, high blood pressure, glaucoma, diabetes, liver or kidney disease, urination problems, or an overactive thyroid.

Also tell your doctor about all other medications you use.

This medication can cause side effects that may cause drowsiness, dizziness, or blurred vision. Be careful if you drive or do anything that requires you to be alert and able to see clearly.

Talk with your doctor if your symptoms do not improve after 7 days of taking this medication. Call your doctor any time if your symptoms get worse or if you also have a fever, headache, or skin rash.

What should I discuss with my health care provider before taking Phencarb GG?

Do not use a cough or cold medicine if you have used an MAO inhibitor such as isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam), or tranylcypromine (Parnate) within the past 14 days. Serious, life-threatening side effects can occur if you take a cough or cold medicine before the MAO inhibitor has cleared from your body.

You should not use this medication if you are allergic to carbetapentane, guaifenesin, or phenylephrine.

If you have certain conditions, you may need a dose adjustment or special tests to safely use this medication. Before you take Phencarb GG, tell your doctor if you have:

  • asthma, emphysema, or other breathing problems
  • heart disease or high blood pressure
  • glaucoma
  • diabetes
  • liver or kidney disease
  • an enlarged prostate or urination problems; or
  • overactive thyroid.

FDA pregnancy category C. It is not known whether this medication is harmful to an unborn baby. Before taking Phencarb GG, tell your doctor if you are pregnant or plan to become pregnant during treatment.

This medication can pass into breast milk and may harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

Older adults may be more likely to have side effects from this medication.

How should I take Phencarb GG?

Take this medication exactly as it was prescribed for you. Do not take the medication in larger amounts, or take it for longer than recommended by your doctor. Follow the directions on your prescription label. Cold medicine is usually taken for only a short time until your symptoms clear up.

Always ask a doctor before giving a cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.

Take this medication with a full glass of water. Drink extra fluids to help loosen the congestion and lubricate your throat while you are taking this medication.

You may take this medication with or without food. Taking it with food or milk may decrease stomach upset.

Measure the liquid medicine with a special dose-measuring spoon or cup, not a regular table spoon. If you do not have a dose-measuring device, ask your pharmacist for one.

Do not crush, chew or break an extended-release tablet. Swallow the pill whole. Breaking or opening the pill may cause too much of the drug to be released at one time.

Talk with your doctor if your symptoms do not improve after 7 days of taking this medication. Call your doctor any time if your symptoms get worse or if you also have a fever, headache, or skin rash.

This medication can cause you to have unusual results with medical tests. Tell any doctor who treats you if you have taken a cold medicine within the past few days.

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

Store this medication at room temperature away from moisture, heat, and light. Do not allow liquid medicine to freeze.

What happens if I miss a dose?

Since cold or allergy medicine is often taken as needed, you may not be on a dosing schedule. If you are taking the medication regularly, take the missed dose as soon as you remember. If it is almost time for your next dose, wait until then to take the medicine and skip the missed dose. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention if you think you have used too much of this medicine.

Overdose can cause confusion, agitation, hallucinations, or seizure (convulsions).

What should I avoid while taking Phencarb GG?

This medication can cause side effects that may cause drowsiness, dizziness, or blurred vision. Be careful if you drive or do anything that requires you to be alert and able to see clearly.

Do not use any other over-the-counter cough, cold, or allergy medication without first asking your doctor or pharmacist. Guaifenesin and decongestants are contained in many combination medicines available over the counter. If you take certain products together you may accidentally take too much of a certain drug. Read the label of any other medicine you are using to see if it contains a guaifenesin or a decongestant.

What are the possible side effects of Phencarb GG?

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

Stop using this medication and call your doctor at once if you have a serious side effect such as:

  • confusion, hallucinations
  • tremors; or
  • extreme weakness.

Less serious side effects may include:

  • drowsiness, dizziness
  • headache
  • feeling nervous
  • sleep problems (insomnia); or
  • nausea.

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 Phencarb GG?

Before using this medication, tell your doctor if you regularly use other medicines that make you sleepy (such as cold or allergy medicine, sedatives, narcotic pain medicine, sleeping pills, muscle relaxers, and medicine for seizures, depression, or anxiety). They can add to sleepiness caused by Phencarb GG.

Tell your doctor about all other medications you use, especially:

  • blood pressure medications
  • methyldopa (Aldomet)
  • reserpine;
  • an antidepressant such as amitriptyline (Elavil, Etrafon), clomipramine (Anafranil), desipramine (Norpramin), doxepin (Sinequan), imipramine (Janimine, Tofranil), nortriptyline (Pamelor), and others; or
  • a beta-blocker such as atenolol (Tenormin), carvedilol (Coreg), metoprolol (Lopressor, Toprol), propranolol (Inderal, InnoPran), sotalol (Betapace), and others.

This list is not complete and there may be other drugs that can interact with Phencarb GG. Tell your doctor about all your prescription and over-the-counter medications, vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start a new medication without telling your doctor.

Where can I get more information?

Your pharmacist can provide more information about Phencarb GG.


Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.