Conflicting advice from two drs on claritin (loratadine) d otc. one says take indefinitely, other stop?

D is decongestant: Claritin-d contains two drugs, an antihistaminic named Loratadine and a decongestant adrenergic called pseudoephedrine. It is best to use each drug according to what is intended for. Antihistaminics are to control histamine release and decongestant to reduce swelling and secretions. Continuous use of antihistaminics are helpful for perennial allergies, such as to dust mite.