Zyrtec-d with Chlordiazepoxide mixing medications

Dear Ask The Doctor: Is it safe to mix zyrtec-d with chlordiazepoxide

Dear Melissa: Mixing zyrtec-d (cetrizine/pseudoephidrine) with chlordiazepoxide may result in impairment of mental alertness and performance. The mixture should be avoided if you are doing any work that requires you to be alert. Do not drive when on medication.