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Generic name: guaifenesin and phenylephrine [gwye-FEN-e-sin-and-FEN-il-EFF-rin]
Brand names: Aldex G, Deconex IR, Gilphex TR, Giltuss Sinus and Congestion, Maxi-Tuss PE Jr.,… show all 25 brands
Combinations for the upper respiratory tract

What is Liquid PD?

This leaflet does not list all the brands or forms of guaifenesin or phenylephrine.Guaifenesin acts as an expectorant. Guaifenesin helps to loosen up congestion in the chest and throat, making it easier for you to cough through your mouthDecongestant phenylephrine shrinks the blood vessels of the nasal passages. Dilated blood vessels can cause congestion in the nasal passages.Liquibid-PD is a combination medication used for treating stuffy noses and sinus congestion and to relieve chest congestion due to the common flu or cold.This medication guide does not list all possible uses of Liquibid-PD.

Side effects of Liquibid-PD

If you experience any of the following symptoms of an allergic reaction, seek immediate medical attention: hives, difficulty breathing, swelling of the face, lips, or throat.Liquibid-PD may cause serious side effects. Liquibid-PD should be stopped immediately, and you should consult your doctor if:

  • Fast, pounding, or uneven heartbeat;
  • Severe anxiety, or nervousness.

Liquibid-pd can cause the following side effects:

  • Dry mouth, nose, or throat
  • Nausea, loss of appetite;
  • Feeling excited or restless, especially in children
  • Sleep problems (insomnia);
  • Headache, dizziness.

There may be other side effects. For medical advice on side effects, call your doctor. To report adverse effects, you can contact the FDA at 1-800-FDA-1088.


This medication should not be given to children younger than four years of age. Ask a doctor first before giving cough or cold medication to your child. Children as young as 4 years old can die from the misuse of cough medicines.

Before you take this drug

If you have an allergy to Liquibid-PD, then it is best not to use this product.Liquibid-PD should not be used if an MAO inhibitor has been taken in the last 14 days. Drug interactions may occur. MAO inhibitors are isocarboxazid (linezolid), phenelzine (rasagiline), selegiline (tranylcypromine), and rasagiline.

If you suffer from:

  • Heart disease and coronary arterial disease.
  • Diabetes;
  • Circulation problems
  • Glaucoma;
  • Overactive thyroid gland;
  • An enlarged prostate or problems urinating

This medication is not known to be harmful to an unborn child. If you are pregnant, do not take Liquibid-PD unless a doctor has prescribed it.Guaifenesin, phenylephrine, and other drugs can pass through breast milk to harm nursing babies. Decongestants can also reduce breast milk production. Do not use this medication without consulting a doctor if you are breastfeeding a child.Phenylalanine can be found in artificially sweetened liquid medicines. If you have phenylketonuria, check the label of your medication.

How to take Liquibid-PD?

Do not exceed the recommended dosage or duration. Use the recommended dose or duration. Do not exceed it. Cold or cough medicine is typically taken for only a few days until symptoms disappear.This medication should not be given to children younger than four years of age. Ask a doctor first before giving cough and cold medicine to children. Children as young as 4 years old can die from the misuse of cough and cold medicines.Use the provided dosing syringe or a dose-measuring cup or spoon to measure liquid medicines. Ask your pharmacist if you don't have a device for measuring doses.You should not open, crush, chew, or break an extended-release capsule or tablet. Swallow the capsule or tablet whole.While taking this medication, drink extra fluids in order to loosen congestion and lubricate the throat.If your symptoms don't improve within 7 days or you experience a headache, a cough, or a skin rash, call your doctor.Keep away from moisture and heat at a room temperature.

What happens if I miss the dose?

Liquibid PD can be taken as needed, and you don't need to follow a schedule. Take the missed dose immediately if you take the medication regularly. Skip the missed dosage if your next dose is scheduled soon. Do not increase your dose to make up for the missed one.

What happens if I overdose?

For poison assistance, call 1-800-222-1222 or get immediate medical help.

What should be avoided?

This medication can affect your ability to think or react. You should be careful when driving or doing anything else that requires you to remain alert.Alcohol can enhance certain side effects from guaifenesin or phenylephrine.Before using any other cough, cold, or allergy medicines, consult your doctor or pharmacist. Many combination medicines contain Liquibid-PD. You can get too much medication from certain products when you combine them.

Interaction with other drug

Before using Liquibid PD, ask your doctor or pharmacist if you also use any other medications, such as vitamins and herbal remedies. When used together, some medicines can have unwanted or harmful effects. The drug guide doesn't list every possible interaction.This medicine can have a negative effect if taken with drugs that cause you to sleep or slow down your breathing. You should consult your doctor before taking Liquibid PD along with a sleeping tablet, narcotic pain medication, muscle relaxer, or medicine to treat anxiety, depression, or seizures.