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Aller-Ease Side Effects

Generic name: fexofenadine

Medically reviewed by Last updated on Oct 3, 2022.

Note: This document contains side effect information about fexofenadine. Some dosage forms listed on this page may not apply to the brand name Aller-Ease.


Common side effects of Aller-Ease include: headache. Other side effects include: otitis media. Continue reading for a comprehensive list of adverse effects.

Applies to fexofenadine: oral capsules and tablets, oral fixed-combination tablets.

Side effects include:

Children 6–11 years of age receiving conventional tablets: Headache, upper respiratory tract infection, coughing, accidental injury, fever, pain, otitis media.

Adults and children ≥12 years of age receiving conventional capsules or tablets: Viral infection (e.g., cold, flu), nausea, dysmenorrhea, sinusitis, dizziness, drowsiness, dyspepsia, fatigue, headache, upper respiratory tract infection, back pain.

Fixed-combination fexofenadine (the active ingredient contained in Aller-Ease) hydrochloride (60 mg)/pseudoephedrine hydrochloride (120 mg): Headache, insomnia, nausea, dry mouth, dyspepsia, throat irritation, dizziness, agitation, back pain, palpitation, nervousness, anxiety, upper respiratory tract infection, abdominal pain.

For Healthcare Professionals

Applies to fexofenadine: oral capsule, oral suspension, oral tablet, oral tablet disintegrating.


The most commonly reported side effects included headache, drowsiness, dizziness, and nausea.[Ref]


Very common (10% or more): Vomiting (up to 12%)

Common (1% to 10%): Nausea, diarrhea, stomach discomfort[Ref]

Nervous system

Very common (10% or more): Headache (up to 10.3%)

Common (1% to 10%): Drowsiness, dizziness, somnolence[Ref]


Common (1% to 10%): Otitis media, pyrexia, fatigue, extremity pain[Ref]


Common (1% to 10%): Cough, upper respiratory tract infection, rhinorrhea

Frequency not reported: Dyspnea[Ref]


Common (1% to 10%): Back pain[Ref]


Common (1% to 10%): Dysmenorrhea[Ref]


Frequency not reported: Insomnia, nervousness, nightmares, sleep disorders or paroniria/excessive dreaming[Ref]


Frequency not reported: Palpitations, tachycardia, chest tightness[Ref]


Frequency not reported: Hypersensitivity reactions, angioedema, systemic anaphylaxis[Ref]


Frequency not reported: Rash, pruritus, flushing[Ref]

Frequently asked questions


1. Product Information. Allegra (fexofenadine). Hoechst Marion Roussel. 2001.

2. Cerner Multum, Inc. UK Summary of Product Characteristics.

3. Cerner Multum, Inc. Australian Product Information.

Further information

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.