Can you take adipex and allegra D together?

Generally yes, but be careful with the Excedrin product line, which has undergone significant expansion. "Regular" Excedrin is fine with Allegra-D, but any "cough & cold" type product may not be.

Allegra-D contains an antihistamine and a decongestant. Read your excedrin label carefully to ensure it does not contain a therapeutic duplication.