Allegra-D 12 Hour Side Effects

Generic name: fexofenadine / pseudoephedrine

Medically reviewed by Drugs.com. Last updated on Oct 1, 2023.

Note: This document provides detailed information about Allegra-D 12 Hour Side Effects associated with fexofenadine / pseudoephedrine. Some dosage forms listed on this page may not apply specifically to the brand name Allegra-D 12 Hour.

Applies to fexofenadine / pseudoephedrine: oral tablet extended release, oral tablet extended release 24 hr.

Serious side effects of Allegra-D 12 Hour

Along with its needed effects, fexofenadine/pseudoephedrine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor as soon as possible if any of the following side effects occur while taking fexofenadine / pseudoephedrine:

More common

• trouble in sleeping

Less common

• cough
• dizziness
• irregular heartbeat
• nervousness
• sore throat

Incidence not known

• difficult or labored breathing
• difficulty swallowing
• dizziness
• fast heartbeat
• feeling of warmth
• fever
• hives or welts
• itching skin
• itching, puffiness or swelling of the eyelids or around the eyes, face, lips or tongue
• large, hive-like swelling on face, eyelids, lips, tongue, throat, hands, legs, feet, sex organs
• reddening of the skin, especially around ears
• redness of the face, neck, arms and occasionally, upper chest
• shortness of breath
• skin rash
• tightness in chest
• swelling of eyes, face, or inside of nose
• unusual tiredness or weakness
• wheezing

Other side effects of Allegra-D 12 Hour

Some side effects of fexofenadine / pseudoephedrine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

• headache
• nausea

Less common

• abdominal or stomach pain
• agitation
• anxiety
• back pain
• dry mouth
• heartburn

Incidence not known

• terrifying dreams causing sleep disturbances

For healthcare professionals

Applies to fexofenadine / pseudoephedrine: oral tablet extended release.

Nervous system

• Common (1% to 10%): Headache, drowsiness, dizziness
• Frequency not reported: Nervousness, insomnia, sleep disorders^[Ref]

Hypersensitivity

• Rare (less than 0.1%): Hypersensitivity reactions (e.g. angioedema, chest tightness, dyspnea, flushing, systemic anaphylaxis)^[Ref]

Gastrointestinal

• Common (1% to 10%): Nausea^[Ref]

Other

• Common (1% to 10%): Fatigue^[Ref]

Dermatologic

• Rare (less than 0.1%): Rash, urticaria, pruritus^[Ref]

Psychiatric

• Frequency not reported: Paranoia^[Ref]

Further information

Allegra-D 12 Hour side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.

Medical Disclaimer