yes, antihistamine such as zyrtec has no known side effects for most people even with high blood pressure. Although it may cause sleepiness for some, just avoid activities that will require motor skills like driving or operating heavy machine. Take it in the evening after supper.
- Zyrtec Information for Consumers
- Zyrtec Information for Healthcare Professionals (includes dosage details)
- Side Effects of Zyrtec (detailed)
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