Allfen A

Generic Name: chlorpheniramine/guaifenesin (KLOR-fen-IR-a-meen/gwye-FEN-e-sin)
Brand Name: Allfen A

Allfen A is used for:

Relieving allergy symptoms (eg, runny nose, watery eyes, itchy nose and throat) and dry, nonproductive cough. It may also be used for other conditions as determined by your doctor.

Allfen A is an antihistamine and expectorant combination. The antihistamine works by blocking the action of histamine, which helps reduce symptoms such as watery eyes and sneezing. The expectorant helps to loosen mucus.

Do NOT use Allfen A if:

  • you are allergic to any ingredient in Allfen A
  • you are having an asthma attack
  • you are in the last 3 months of pregnancy or are breast-feeding
  • you have angle-closure glaucoma, peptic ulcer, or difficulty urinating
  • you are taking sodium oxybate (GHB) or you have taken furazolidone or a monoamine oxidase inhibitor (MAOI) within the last 14 days

Contact your doctor or health care provider right away if any of these apply to you.

Slideshow: OTC Medication Use In Pregnancy: Wise or Worrisome?

Before using Allfen A:

Some medical conditions may interact with Allfen A. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

  • if you are pregnant, planning to become pregnant, or are breast-feeding
  • if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
  • if you have allergies to medicines, foods, or other substances
  • if you have a history of asthma; lung problems (eg, emphysema); breathing problems while sleeping (eg, sleep apnea); heart problems; high blood pressure; heart blood vessel problems; glaucoma or increased pressure in the eye; bladder, stomach, or bowel blockage; ulcers; an enlarged prostate; or seizures

Some MEDICINES MAY INTERACT with Allfen A. Tell your health care provider if you are taking any other medicines, especially any of the following:

  • Barbiturates (eg, phenobarbital), furazolidone, MAOIs (eg, phenelzine), sodium oxybate (GHB), or tricyclic antidepressants (eg, amitriptyline) because they may increase the risk of Allfen A's side effects

This may not be a complete list of all interactions that may occur. Ask your health care provider if Allfen A may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.

How to use Allfen A:

Use Allfen A as directed by your doctor. Check the label on the medicine for exact dosing instructions.

  • Take Allfen A by mouth with or without food. If stomach upset occurs, take with food to reduce stomach irritation.
  • If you miss a dose of Allfen A, take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.

Ask your health care provider any questions you may have about how to use Allfen A.

Important safety information:

  • Allfen A may cause drowsiness or dizziness. These effects may be worse if you take it with alcohol or certain medicines. Use Allfen A with caution. Do not drive or perform other possibly unsafe tasks until you know how you react to it.
  • Do not drink alcohol or use medicines that may cause drowsiness (eg, sleep aids, muscle relaxers) while you are using Allfen A; it may add to their effects. Ask your pharmacist if you have questions about which medicines may cause drowsiness.
  • The risk of drowsiness or other side effects may be greater if you take Allfen A in high doses or for a long time. Do NOT take more than the recommended dose without checking with your doctor.
  • If your symptoms do not get better or if they get worse, check with your doctor.
  • Allfen A may cause dry mouth. Taking sips of water or sucking ice chips may help. Chewing sugarless gum or sucking hard sugarless candy may also help.
  • Allfen A has chlorpheniramine in it. Before you start any new medicine, check the label to see if it has chlorpheniramine in it too. If it does or if you are not sure, check with your doctor or pharmacist. Do not take any other antihistamine while you take Allfen A.
  • Allfen A may cause you to become sunburned more easily. Avoid the sun, sunlamps, or tanning booths until you know how you react to Allfen A. Use a sunscreen or wear protective clothing if you must be outside for more than a short time.
  • Allfen A may interfere with certain lab tests. Be sure your doctor and lab personnel know you are taking Allfen A.
  • If you are scheduled for a skin test, talk to your doctor. You may need to stop taking Allfen A for a few days before the tests.
  • Tell your doctor or dentist that you take Allfen A before you receive any medical or dental care, emergency care, or surgery.
  • Use Allfen A with caution in the ELDERLY; they may be more sensitive to its effects.
  • Allfen A should be used with extreme caution in CHILDREN younger than 6 years old; safety and effectiveness in these children have not been confirmed.
  • PREGNANCY and BREAST-FEEDING: If you become pregnant, contact your doctor. You will need to discuss the benefits and risks of using Allfen A while you are pregnant. Do not use Allfen A if you are in the last 3 months of pregnancy. It is not known if Allfen A is found in breast milk. Do not breast-feed while taking Allfen A.

Possible side effects of Allfen A:

All medicines may cause side effects, but many people have no, or minor side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Constipation; diarrhea; dizziness; drowsiness; dry mouth, nose, or throat; headache; loss of appetite; nausea; upset stomach; vomiting; weakness.

Seek medical attention right away if any of these SEVERE side effects occur:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); blurred vision or other vision changes; changes in thinking or behavior; confusion; difficult or painful urination; excitability; fainting; fast, slow, or irregular heartbeat; fever, chills, or persistent sore throat; flushing; hallucinations; inability to urinate; loss of coordination; mood or mental changes; nervousness or anxiety; ringing in the ears or other hearing changes; seizures; severe drowsiness; severe dry mouth, nose, or throat; severe or persistent dizziness, lightheadedness, or headache; shortness of breath; slow or irregular breathing; tremor; trouble sleeping; unusual bruising or bleeding; unusual tiredness or weakness.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.

If OVERDOSE is suspected:

Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center, or emergency room immediately. Symptoms may include confusion; fever; flushing; hallucinations; seizures; severe dizziness or lightheadedness; severe drowsiness; trouble sleeping.

Proper storage of Allfen A:

Store Allfen A at room temperature, between 59 and 86 degrees F (15 and 30 degrees C). Store away from heat, moisture, and light. Do not store in the bathroom. Keep Allfen A out of the reach of children and away from pets.

General information:

  • If you have any questions about Allfen A, please talk with your doctor, pharmacist, or other health care provider.
  • Allfen A is to be used only by the patient for whom it is prescribed. Do not share it with other people.
  • If your symptoms do not improve or if they become worse, check with your doctor.
  • Check with your pharmacist about how to dispose of unused medicine.

This information is a summary only. It does not contain all information about Allfen A. If you have questions about the medicine you are taking or would like more information, check with your doctor, pharmacist, or other health care provider.

Issue Date: July 2, 2014
Database Edition 14.3.1.001
Copyright © 2014 Wolters Kluwer Health, Inc.

Disclaimer: This information should not be used to decide whether or not to take this medicine or any other medicine. Only your health care provider has the knowledge and training to decide which medicines are right for you. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about this medicine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not specific medical advice and does not replace information you receive from your health care provider. You must talk with your healthcare provider for complete information about the risks and benefits of using this medicine.

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