I have come a bit late to this topic- only just realised that Miralax is the US equivalent of the Movicol that I take. The Movial is supplied in sachets of powder which you mix with 125 mls of water. My gastro tells me to take between 1 and 3 sachets as necessary. I usually take them at intervals during the day. I find that if I am in constipated phase, one sachet really does nothing , I need to take three. Once things are moving again, one is enough.
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