My experience with Zantac is useless to you because it had no effect on me whatsoever, for good or ill. In general, I find that other people's experiences with medication have no predictive effect for mine, because I tend toward unusual reactions.

However, what I have learned recently is that I tend to have consistent responses to all medication in certain ways. So if you're similar, you may be able to predict what Zantac will do to you based on your own previous experiences. For example, if a drug gives me a side effect, it either goes away after a few days or never goes away - it won't linger for a week or two, then wear off. This is true of virtually all drugs for me. So if you also respond consistently to drugs and you're still getting that effect after three days (even with breakfast), it probably won't ever go away and that's not a good med for you. However, some people find that side effects go away after a longer period of time, so if you're more like that, you might want to give it a week or so.