Suddenly spitting up?

My 12 week old daughter has acid reflux and has been on Zantac since about 6 weeks. Before the Zantac, she would spit up a lot, right after eating. After starting the medicine, she never spit up and now just since last week has started again. She had outgrown the dosage and on Monday they upped the dosage but it seems it has gotten worse since then which makes no sense. It doesn't happen right after she eats, maybe an hour or two later and not after every feeding. There has been no other changes, she is formula fed and is on the same formula she has always been on. She isn't fussy when she spits up, it doesn't seem to bother her at all. I can't come up with a pattern, its not when she's hot, although it has happened then, it just seems almost random. She is drooling a lot, not teething yet but not sure if this could have anything to do with it or not!


Just wondering if anyone else has noticed their LO spitting up more or having any ideas as to what could possibly be causing it. I've racked my brain and can't think of any reason!