Fexofenadine and Pseudoephedrine (patient information)
Why this medication is prescribed
The combination of fexofenadine and pseudoephedrine is used in adults and children 12 years of age and older to relieve the allergy symptoms of seasonal allergic rhinitis ('hay fever'), including runny nose; sneezing; congestion (stuffy nose); red, itchy, or watery eyes; or itching of the nose, throat, or roof of the mouth. Fexofenadine is in a class of medications called antihistamines. It works by blocking the effects of histamine, a substance in the body that causes allergy symptoms. Pseudoephedrine is in a class of medications called decongestants. It works by drying up the nasal passages.
How this medication should be used
The combination of fexofenadine and pseudoephedrine comes as an extended-release (long-acting) tablet to take by mouth. The fexofenadine and pseudoephedrine 12-hour tablet is usually taken once or twice a day on an empty stomach with water. The fexofenadine and pseudoephedrine 24-hour tablet is usually taken once a day on an empty stomach with water. Fexofenadine and pseudoephedrine will work better if it is not taken with fruit juices such as orange, grapefruit, or apple juice. Take fexofenadine and pseudoephedrine at around the same time(s) every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take fexofenadine and pseudoephedrine exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
Fexofenadine and pseudoephedrine controls the symptoms of seasonal allergic rhinitis but does not cure this condition. Continue to take fexofenadine and pseudoephedrine even if you feel well and are not experiencing these symptoms. If you wait too long between doses, your symptoms may become worse.
Swallow the tablets whole; do not split, chew, or crush them.
Other uses for this medicine
This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.
Special precautions
Before taking fexofenadine and pseudoephedrine:
- tell your doctor and pharmacist if you are allergic to fexofenadine (Allegra), pseudoephedrine (Sudafed, in Dimetapp, in Drixoral, others), any other medications, or any of the ingredients in the tablets. Ask your pharmacist for a list of the ingredients.
- do not take fexofenadine and pseudoephedrine if you are taking monoamine oxidase (MAO) inhibitors, including isocarboxazid (Marplan), phenelzine (Nardil), selegiline (Eldepryl), and tranylcypromine (Parnate), or have taken them within the past 14 days.
- tell your doctor and pharmacist what prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: asthma medications; diet pills; digoxin (Digitek, Lanoxin, Lanoxicaps); erythromycin (E.E.S., E-Mycin, Erythrocin); ketoconazole (Nizoral); medications for high blood pressure such as methyldopa (Aldomet) and reserpine (Serpalan, Serpasil, Serpatabs); and over-the-counter antihistamines, decongestants, or stimulants. Your doctor may need to change the doses of your medications or monitor you carefully for side effects.if you are taking an antacid containing aluminum or magnesium (Maalox, Mylanta, others), take the antacid a few hours before or after fexofenadine.
- tell your doctor if you have glaucoma, difficulty urinating, high blood pressure, or coronary artery disease (condition that occurs when the blood vessels of the heart are narrowed by fat or cholesterol deposits). Also tell your doctor if you have had symptoms such as insomnia, dizziness, weakness, shaking of a part of your body that you can not control, or a fast, pounding, or irregular heartbeat after taking adrenergic medications such as phenylephrine (Neo-Synephrine), or epinephrine (Primatene Mist, EpiPen). Your doctor may tell you not to take fexofenadine and pseudoephedrine.
- tell your doctor if you have or have ever had angina (chest pain or pressure), diabetes, a heart attack, hyperthyroidism (an overactive thyroid gland) , prostatic hypertrophy (an enlarged prostate), or heart or kidney disease.
- tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking fexofenadine and pseudoephedrine, call your doctor.
Special dietary instructions
Caffeine-containing beverages (coffee, tea, sodas, and energy drinks) may increase the restlessness and insomnia caused by pseudoephedrine in sensitive individuals, so you may wish to drink less of these beverages. Talk to your doctor about drinking these beverages while taking this medication.
What to do if you forget a dose
Take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.
Side effects
Minor side effects
Fexofenadine and pseudoephedrine may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
- headache
- nausea
- stomach pain
- heartburn
- dry mouth
- throat irritation
- back pain
- pale skin
Severe side effects
Some side effects can be serious. The following symptoms are uncommon, but if you experience any of them, call your doctor immediately:
- nervousness
- dizziness
- difficulty falling asleep or staying asleep
- weakness
- fear, anxiety, or tenseness
- hallucinating (seeing things or hearing voices that do not exist)
- shaking of a part of your body that you cannot control
- seizure
- fainting
- blurred vision
- hives
- rash
- itching
- difficulty breathing or swallowing
- swelling of the face, throat, tongue, lips, eyes, hands, feet, ankles, or lower legs
- hoarseness
- fast pounding, or irregular heartbeat
- difficulty or pain when urinating
Fexofenadine and pseudoephedrine may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.
Storage conditions needed for this medication
Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom). Throw away any medication that is outdated or no longer needed. Talk to your pharmacist about the proper disposal of your medication.
In case of emergency/overdose
In case of overdose, call your local poison control center at 1-800-222-1222. If the victim has collapsed or is not breathing, call local emergency services at 911.
Symptoms of overdose may include:
- dizziness
- drowsiness
- dry mouth
- giddiness
- headache
- nausea
- vomiting
- sweating
- thirst
- fast or pounding heartbeat
- chest pain
- difficulty breathing
- difficulty urinating
- muscle weakness or tenseness
- nervousness
- restlessness
- difficulty falling asleep or staying asleep
- hallucinating (hearing voices or seeing things that do not exist)
- seizures
- coma
Other information
If you are taking fexofenadine and pseudoephedrine 12-hour tablets, you may notice something that looks like a tablet in your stool. This is just the empty tablet shell, and this does not mean that you did not get your complete dose of medication.
Keep all appointments with your doctor.
Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription.
Brand names
- Allegra-D® 12 Hour
- Allegra-D® 24 Hour