@sylvermoon8 I live overseas where they sell the Gaviscon that has alginate under the name Gaviscon, so I don't know where to get Gaviscon Advance.
This Gaviscon also wears off, so if I wake up with reflux I take a half a Tums or more Gaviscon. Or, instead take famotidine 20 mg at bedtime, which usually lasts the night.
Best to watch diet, finish eating early, sleep on wedge or top of bed raised.