I have been taking Pepcid Complete for several years now. I choose Pepcid Complete as you can take it before heartburn starts if you know a meal or drink will cause heartburn or after heartburn has already struck. I never know which meal may give me heartburn and sometimes I get it for no apparent reason. It works fast. Immediacy Pepcid works fast. If I get heartburn I just take one and I start to feel relief within a few minutes.