I Have Been Using Oral Ranitidine For Reflux On My

I have been using oral Ranitidine for reflux on my two month old. I have notice that he gets nauseated more then usual and increase in salvation. It's hard to tell if the occasion vomiting is his reflux or possible side effect.He is gaining wit.well and on last pediatric visit we where told he was doing well.Also now sleeping better then usual but I am concern that he is sleeping a lot.It could be the medication ,but I am not sure.