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
Clarinex
Zyrtec vs. Clarinex Dosage
Zyrtec
Clarinex
| 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 |
| 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
| 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
| 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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