Hi, ds was prescribed ranitidine last week for reflux and he's had his worst day yet today :( thrown up every bottle! Poor baby. Gaviscon didn't work just made him constipated. He's on sma staydown which clearly isn't working either. Gp doesn't think its pyloric stenosis or intolerance. How long should I give the ranitidine to work? I'm mindful that it smells quite potent and don't want to medicate him if its not doing anything. Seriously considering weaning, he is 17 weeks next week but don't think he's ready have tried him with baby rice and pear puree and he just spits it out. I thought I had it bad with dd having colic but at least she grew out of this at 3 months.