Chlorpheniramine, methscopolamine, and phenylephrine
Generic name: chlorpheniramine, methscopolamine, and phenylephrine [ KLOR-fen-IR-a-meen, METH-skoe-POL-a-meen, FEN-il-EFF-rin ]
Brand names: AH-Chew II, Sinodec, Extendryl SR, Prehist D, Extendryl Chews, ... show all 61 brands
Dosage form: oral tablet, chewable (2 mg-1.25 mg-15 mg)
Drug class: Upper respiratory combinations
What is chlorpheniramine, methscopolamine, and phenylephrine?
Chlorpheniramine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.
Methscopolamine reduces the secretions of certain organs in the body.
Chlorpheniramine, methscopolamine, and phenylephrine is a combination medicine used to treat runny or stuffy nose, sneezing, itching, watery eyes, and sinus congestion caused by allergies, the common cold, or the flu.
Chlorpheniramine, methscopolamine, and phenylephrine may also be used for purposes not listed in this medication guide.
Chlorpheniramine, methscopolamine, and phenylephrine side effects
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 chlorpheniramine, methscopolamine, and phenylephrine and call your doctor at once if you have:
little or no urinating;
fast, pounding, or irregular heartbeats;
pale skin, weakness, feeling short of breath; or
tremors, hallucinations, severe anxiety.
Common side effects of chlorpheniramine, methscopolamine, and phenylephrine may include:
blurred vision, headache, dizziness;
dry mouth, nose, or throat;
feeling nervous or restless.
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.
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, phenelzine, rasagiline, selegiline, and tranylcypromine.
Before taking this medicine
You should not use this medication if you are allergic to chlorpheniramine, methscopolamine, or phenylephrine.
Do not use chlorpheniramine, methscopolamine, and phenylephrine 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 medicine if you have:
asthma or COPD, cough with mucus, or cough caused by smoking, emphysema, or chronic bronchitis;
a blockage in your stomach or intestines;
kidney or liver disease;
enlarged prostate or urination problems;
pheochromocytoma (an adrenal gland tumor);
overactive thyroid; or
if you take potassium (Cytra, Epiklor, K-Lyte, K-Phos, Kaon, Klor-Con, Polycitra, Urocit-K).
FDA pregnancy category C. It is not known whether this medicine will harm an unborn baby. Do not use without medical advice if you are pregnant.
This medicine may pass into breast milk and may harm a nursing baby. Antihistamines and decongestants may also slow breast milk production. Do not use without medical advice if you are breast-feeding a baby.
Artificially sweetened cold medicine may contain phenylalanine. If you have phenylketonuria (PKU), check the medication label to see if the product contains phenylalanine.
How should I take chlorpheniramine, methscopolamine, and phenylephrine?
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. This medicine is usually taken only for a short time until your symptoms clear up.
Do not give this medication to a child younger than 4 years old. 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.
The chewable tablet must be chewed before you swallow it.
Do not crush, chew, or break an extended-release tablet. Swallow it whole.
Measure liquid medicine with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one.
If you need surgery or medical tests, tell the surgeon or doctor ahead of time if you have taken this medicine within the past few days.
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. Do not allow the liquid form of this medicine to freeze.
What happens if I miss a dose?
Since chlorpheniramine, methscopolamine, and phenylephrine 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. Do not take extra medicine to make up the missed dose.
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 chlorpheniramine, methscopolamine, and phenylephrine?
chlorpheniramine, methscopolamine, and phenylephrine may cause blurred vision or impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert and able to see clearly.
Drinking alcohol can increase certain side effects of chlorpheniramine.
Ask a doctor or pharmacist before using any other cold, cough, allergy, or sleep medicine. Antihistamines and decongestants are contained in many combination medicines. Taking certain products together can cause you to get too much of a certain drug. Check the label to see if a medicine contains an antihistamine or decongestant.
What other drugs will affect chlorpheniramine, methscopolamine, and phenylephrine?
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.
Taking this medicine with other drugs that make you sleepy or slow your breathing can worsen these effects. Ask your doctor before taking chlorpheniramine, methscopolamine, and phenylephrine with a sleeping pill, narcotic pain medicine, muscle relaxer, or medicine for anxiety, depression, or seizures.
More about chlorpheniramine / methscopolamine / phenylephrine
- Check interactions
- Compare alternatives
- Reviews (6)
- Drug images
- Side effects
- Dosage information
- During pregnancy
- Drug class: upper respiratory combinations
- En español
Related treatment guides
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.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Copyright 1996-2024 Cerner Multum, Inc. Version: 7.01.