Can you take Zyrtec if allergic to codeine?

Yes, you can take Zyrtec (cetirizine) if you are allergic to codeine. Zyrtec is an antihistamine used to relieve allergy symptoms, while codeine is an opioid pain medication. They belong to different drug classes and do not have cross-reactivity. However, if you have concerns about Allergies to medications, it's always best to consult your healthcare provider.