Gaviscon - making feeds

[PurpleDana]

Quick question -
At 13wks my dd has just been diagnosed with reflux :-( So we are back home with gaviscon and I'm reading what to do with it...
But I make up 3 feeds at a time, storing them in the fridge (I know this isn't recommended but it's how it works for us), do I add the gaviscon when I make the feeds up (will it be ok refridgerated?), when I take a bottle out to warm (still cold), or when it is warmed and ready to go?

Does it say anything about temperature affecting the medicine? It might make sense to add it at the last minute if it doesn't say anything about heating it. Not sure, ring NHS Direct? Hope you get your info.

Only says not to store above 30degees, nothing about below.
But I think I have found the info via google - gaviscon acts as a thickener & designed to start working by the time it gets to baby's tummy, so makes sense not to add it until it is needed or it might react like a jelly and start setting in the fridge!
So I'm gonna add the powder just before giving it to baby

My dd was on this.

When u have warmed the milk ready to serve, add the powder once its warm. Stir with a spoon otherwise it will clump together