Studies show that "newer" antihistamines—both prescription and OTC, such as those listed above ... for a few weeks or if drugs like Mylanta, Pepcid, or Zantac don't provide the relief you ...

For example, antacids such as Tums can make many prescription drugs less effective ... which include cimetidine (Tagamet OTC), famotidine (Pepcid AC), nizatidine (Axid AR), and ranitidine ...

There are a lot of allergy medications out there on the market, but there are some differences between the over-the-counter medications versus prescription medications. The biggest difference ...