Fexofenadine
Brand: Allegra
No boxed warning on the current FDA label.
- Caution
- Fruit juice (orange, grapefruit, apple) reduces absorption; take with water.
Common side effects
- Headache
- Nausea
- Drowsiness
- Dizziness
- Back pain
Key interactions
- Fruit juices reduce its absorption
- Antacids with aluminum or magnesium lower levels
- Erythromycin and ketoconazole raise its levels
Counseling points
- Take with water, not fruit juice
- Separate from antacids by a couple hours
- May take with or without food
- Less likely to cause drowsiness
- Take as needed for allergy symptoms
- Less sedating than older antihistamines
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High-yield study aid for exam prep, not a substitute for the package insert or a pharmacist’s dispensing reference.