For treatment of cough and runny nose
Do not give Promethazine and Zyrtec together. They are both antihistamines and work in the same way - you would be doubling up on meds.
You could give Zyrtec during the day and Promethazine at night. Drowsiness is a side effect of Promethazine so could help your daughter to get a good nights sleep.
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