Is anyones LO on prevacid? We started prevacid last week but he was only prescribed 4.5 mg or 1.5ml once a day and it is compounded. It was working well until a few nights ago. I called the doctor about the dose because he is not sleeping but he said he will not adjust it for a few weeks. I made an appointment with a pediatric GI but was not able to get an appointment for a few weeks. From what i have been researching 4.5 mg is a very small dose for a 13lb 4 ounce baby.