This question has also been asked and answered here: Allegra vs Claritin: What's the Difference?
Claritin can take up to two to three hours to reach its peak effect. Other antihistamines such as Zyrtec work within an hour.
- Claritin Information for Consumers
- Claritin Information for Healthcare Professionals (includes dosage details)
- Side Effects of Claritin (detailed)
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