Jenn,
I can relate. My son Nathan is on 15 mg twice a day (first thing in the morning and before the bedtime feeding), and by the afternoon he is in pain again. If your son’s doctor will increase the Prevacid dose, I’d definitely go that route. Ours will go no higher than 30 mg (and I truly am thankful for that), but for Nathan it’s not quite enough for 24-hour relief. Like Therese mentioned, I give the full Zantac dose (10 mg/kg) at once, but it doesn’t help as much as another dose of Prevacid would. Good luck!!