Generic name: Guaifenesin and pseudoephedrine
Pregnancy & Lactation: Risk data not available
What is Syn-Rx?
There are many brands and forms of guaifenesin and pseudoephedrine available and not all brands are listed on this leaflet.
Guaifenesin is an expectorant. It helps loosen congestion in your chest and throat, making it easier to cough out through your mouth.
Pseudoephedrine is a decongestant that shrinks blood vessels in the nasal passages. Dilated blood vessels can cause nasal congestion (stuffy nose).
Guaifenesin and pseudoephedrine is a combination medicine used to treat stuffy nose and sinus congestion, and to reduce chest congestion caused by the common cold or flu.
Guaifenesin and pseudoephedrine may also be used for purposes not listed in this medication guide.
Warnings
You should not use guaifenesin and pseudoephedrine if you are allergic to it.
It is not known if this medication may be harmful to an unborn baby. Do not use this medicine without medical advice if you are pregnant.
Guaifenesin and pseudoephedrine may pass into breast milk and may harm a nursing baby. Decongestants may also slow breast milk production. Do not use this medicine without medical advice if you are breast-feeding a baby.
Do not use guaifenesin and pseudoephedrine if you have taken an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, phenelzine, rasagiline, selegiline, and tranylcypromine.
Ask a doctor or pharmacist if it is safe for you to take this medication if you have:
Artificially sweetened liquid medicine may contain phenylalanine. Check the medication label if you have phenylketonuria (PKU).
- high blood pressure, heart disease, coronary artery disease;
- diabetes;
- circulation problems;
- glaucoma;
- overactive thyroid; or
- enlarged prostate or problems with urination.
How should I use Syn-Rx
Use Syn-Rx (Oral) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.
Use exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended. Cough or cold medicine is usually taken only for a short time until your symptoms clear up.
Measure liquid medicine with the dosing syringe provided, or with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one.
The must be chewed before you swallow it. chewable tablet
Do not give this medication to a child younger than 4 years old. Death can occur from the misuse of cough or cold medicine in very young children. Always ask a doctor before giving cough or cold medicine to a child.
Do not crush, chew, break, or open an extended-release tablet or capsule. Swallow it whole.
Drink extra fluids to help loosen the congestion and lubricate your throat while you are taking this medication.
Call your doctor if your symptoms do not improve after 7 days of treatment, or if you have a fever with a headache, cough, or skin rash.
Store at room temperature away from moisture and heat.
Since this medicine is taken when 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. Skip the missed dose if it is almost time for your next scheduled dose. take extra medicine to make up the missed dose. Do not
Syn-Rx side effects
Get emergency medical help if you have hives; difficult breathing; swelling of your face, lips, tongue, or throat. signs of an allergic reaction:
Stop using guaifenesin and pseudoephedrine and call your doctor at once if you have:
- fast, pounding, or uneven heartbeat; or
- severe anxiety or nervousness.
- dry mouth, nose, or throat;
- upset stomach, loss of appetite, vomiting;
- feeling excited or restless (especially in children);
- sleep problems (insomnia); or
- headache, dizziness.
Common side effects may include:
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 Syn-Rx?
This medication may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert.
Drinking alcohol with this medicine can cause side effects.
Ask a doctor or pharmacist before using any other cough, cold, or allergy medicine. Guaifenesin and pseudoephedrine are contained in many combination medicines. Taking certain products together can cause you to get too much of a certain drug.