Allergy medicine and cold medicine are best not taken together. The cold medicine currently on the market are compounded ingredients, these cold medicines often already contain, like chlorpheniramine, loratadine and other antihistamine ingredients, if allergy medicine and cold medicine together, it is likely to lead to the doubling of the dose of allergy medicine, allergy medicine in the doubling of the dose will have certain side effects, such as drowsiness, serious can make patients with underlying diseases slow down breathing, on sleep and Therefore, it is not recommended to take allergy medicine and cold medicine together, and remember to read the instructions before taking the medicine.