H-2-receptor blockers. Over-the-counter H-2-receptor blockers, such as cimetidine (Tagamet HB), famotidine (Pepcid AC), nizatidine (Axid AR) or ranitidine (Zantac 75), are available at half the strength of their prescription versions. Instead of neutralizing the acid, these medications reduce the production of acid. They don't act as quickly as antacids, but they provide longer relief. Take these....
