Can i take allegra (fexofenadine) and omeprazole together? it said not to take magnesium antacids with allegra (fexofenadine).

Ok: There's no problem with taking Allegra (fexofenadine) and Omeprazole together. Neither of them contain aluminum.

A valuable resource: You can use a drug interaction checker whenever you have questions about drug-drug interactions or drug - food interactions. Here is 1 option (Drugs.Com): https://www.drugs.com/drug_interactions.php Your pharmacist is also a good source of info.