When did your baby wean off reflux meds? How did it go?

My son was on zantac from 6w-4.5 months and then since on prilosec. He was diagnosed with silent reflux (and became a spitter upper around 4 months) and all along had a dairy intolerance. He doesn't really spit up anymore. Anyways, he goes for a follow up with his GI specialist in a week and I'm wondering if/when we'll wean from prilosec. At the time of his appt, he'll be a week shy of 7 months.