Zyrtec vs. Clarinex

See how Zyrtec and Clarinex compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Zyrtec and Clarinex are both second-generation antihistamines for allergic rhinitis and chronic hives, but Zyrtec is available over-the-counter while Clarinex requires a prescription.

  • Zyrtec causes drowsiness in up to 14% of users, noticeably more than Clarinex, which is considered non-sedating at its recommended dose.

  • Zyrtec typically costs $10 to $25 a month, while Clarinex commonly runs $270 to $300 a month, making cost a major factor for many patients.

Zyrtec vs. Clarinex Drug Summary

Zyrtec

Zyrtec (cetirizine) is a second-generation antihistamine used to relieve symptoms of seasonal and perennial allergic rhinitis and chronic idiopathic urticaria. It is taken once daily as a tablet, chewable tablet, capsule, or oral solution and is available both over-the-counter and by prescription.

Clarinex

Clarinex (desloratadine) is a second-generation antihistamine used to relieve seasonal and perennial allergic rhinitis symptoms as well as chronic idiopathic urticaria. It is taken once daily as a tablet, dissolving RediTab, or oral solution and is available only by prescription.

Zyrtec vs. Clarinex Side Effects

Zyrtec

Most common
Somnolence (up to 14%)
Fatigue (up to 6%)
Dry mouth (up to 5%)
Pharyngitis (up to 2%)

Clarinex

Most common
Somnolence (up to 2.1%)
Fatigue (up to 2.1%)
Dry mouth (up to 3.0%)
Pharyngitis (up to 4.1%)

Zyrtec vs. Clarinex Dosage

Zyrtec

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 2.5 mg once daily At the start
Maximum dose 10 mg once daily If needed
Dose changes 2 increases As tolerated

Clarinex

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 1 mg once daily At the start
Maximum dose 5 mg once daily If needed
Dose changes 3 increases As tolerated

Zyrtec vs. Clarinex Indications

Zyrtec

Zyrtec relieves nasal and skin allergy symptoms for both seasonal and year-round allergies, and it is approved to treat chronic hives. It is approved for use in children as young as 6 months for certain indications.

  • Seasonal allergic rhinitis relief

  • Perennial (year-round) allergic rhinitis relief

  • Chronic idiopathic urticaria (hives)

  • Approved for children as young as 6 months

Clarinex

Clarinex relieves nasal and non-nasal symptoms of seasonal and perennial allergic rhinitis and treats chronic hives. It is approved for ages 6 months and up for perennial rhinitis and hives, and age 2 and up for seasonal rhinitis.

  • Seasonal allergic rhinitis relief (age 2+)

  • Perennial allergic rhinitis relief (age 6mo+)

  • Chronic idiopathic urticaria (age 6mo+)

  • Also available as Clarinex-D with decongestant

Zyrtec vs. Clarinex Pros and Cons

Zyrtec

Zyrtec is a well-established second-generation antihistamine available without a prescription, making it accessible and affordable for most allergy sufferers. It works reliably for rhinitis and hives but carries a higher risk of drowsiness than some other antihistamines in its class.

Pros

  • Available over-the-counter without a prescription

  • Costs roughly $10 to $25 per month without insurance

  • Long safety track record since FDA approval in 1995

  • Offered in tablet, chewable, liquid, and capsule forms

Cons

  • Higher sedation risk than Clarinex, up to 14% of users report it

  • May cause more drowsiness than some other second-generation antihistamines

  • Not approved for infants under 6 months old

  • Fewer approved age-specific liquid dosing options than Clarinex

Clarinex

Clarinex is a prescription-only antihistamine with a lower risk of sedation and pediatric dosing options starting at 6 months. It costs considerably more than over-the-counter alternatives like Zyrtec, which can affect real-world affordability.

Pros

  • Lower risk of drowsiness than Zyrtec at standard doses

  • Approved for infants as young as 6 months for two uses

  • Available as fast-dissolving RediTabs for easy dosing

  • Available as combination Clarinex-D for congestion relief

Cons

  • Available only by prescription, unlike Zyrtec

  • Costs roughly $270 to $300 per month without insurance, versus $10 to $25 for Zyrtec

  • Not sold in an over-the-counter version

  • Slightly higher rate of pharyngitis (4.1%) than Zyrtec (2%)

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