Compare Allegra vs. Zyrtec

Head-to-head comparisons of medication uses, side effects, ratings, and more.

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Allegra (fexofenadine)

Over-the-counter

Zyrtec (Cetirizine)

Prescription or OTC
Treats allergy symptoms.

Allegra (fexofenadine) relieves allergy symptoms without making you feel drowsy.

3.9/ 5 average rating with 24 reviewsforAllegra
Treats allergy symptoms.

Zyrtec (Cetirizine) is a once-daily allergy relief medication that won't make you feel too sleepy.

3.8/ 5 average rating with 1232 reviewsforZyrtec
Upsides
  • Allegra (fexofenadine) is effective at reducing symptoms for seasonal allergies and chronic hives without significant drowsiness, unlike Benadryl.
  • Approved for kids aged 6 months or older.
  • Allegra (fexofenadine) comes in many forms, like tablet, liquid, and quick-dissolving tablet.
  • Zyrtec (Cetirizine) works as well as other antihistamines to treat sneezing and runny nose, but causes less sedation.
  • Works well to also treat hives and itchy skin.
  • Zyrtec (Cetirizine) is available over the counter without a prescription.
  • It comes as a tablet, liquid, and quick-dissolving tablet.
  • It can provide quick relief of allergy symptoms for both kids and adults.
  • It's okay to take with most other medications because it has few drug interactions.
  • Most people don't get any side effects from Zyrtec (Cetirizine).
Downsides
  • Allegra (fexofenadine)'s effectiveness can wear off over time.
  • The dose needs to be adjusted for people with kidney problems.
  • Although it works fast, its effectiveness wears off for some people over time.
  • Zyrtec (Cetirizine) can be slightly more sedating than Allegra or Claritin.
  • Some people find that other more sedating antihistamines, like Benadryl, are more effective for them than Zyrtec (Cetirizine).
  • If you have daily allergy symptoms, a prescription nasal steroid spray might be better for you long-term.
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Used for
Dosage forms
  • Pill
  • Dissolving tablet
  • Liquid
  • Pill
  • Liquid capsule
  • Dissolving tablet
  • Liquid
No pricing information available
No pricing information available
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Reviews
24 reviews so far
79%
saidit'sworth it
63%
saiditworked well
0%
saidit'sa big hassle

Have you used Allegra (fexofenadine)?

Leave a review
1232 reviews so far
76%
saidit'sworth it
47%
saiditworked well
7%
saidit'sa big hassle

Have you used Zyrtec (Cetirizine)?

Leave a review
Side effects
4possible side effects
  • Dizziness
    2%
  • Back Pain
    2%
  • Stomach discomfort
    2%
  • Pain in hands/feet
    2%
See more detailed side effects
The Zyrtec (Cetirizine) FDA package insert doesn’t have numbers about how common side effects are.
Risks and risk factors
  • Driving impairment
    • Taking with alcohol
    • Taking other medicines that make you less alert
  • Brain damage from too much phenylalanine
    • History of phenylketonuria (PKU)
See more detailed risks and warnings
  • Taking the wrong medication
  • Increased side effects
    • Age 65 or older
  • Driving impairment
    • Taking with alcohol
    • Taking other medicines that make you less alert
  • Overdosage
    • Current kidney disease
    • Current liver disease
See more detailed risks and warnings