I just replied to your other question and just copied and pasted it here, I do urge you to talk to your doctor before increasing the meds, but it should only take a couple of days to see an improvement once they are already on it and you increase it:

Hi there I was just browsing and just had to answer your question. The problem is the compounding. Although the pharmacies will say it lasts 4 weeks, it doesn't, it lasts more like 2 weeks.

I would find the exact same thing with my son, and searched around and found that most pharmacies actually compound it incorrectly by adding either too much buffer or use a sweetener, this decreases the stability of the medication.

I would get mine refilled every 2 weeks and split the script and had no problems.

I also wanted to let you know that 20mg a day is a hefty dose for a baby, I am on that much a day for my reflux. Although I am assuming if it has become instable he isn't getting that exact dose. But I would talk to the doctor about increasing it.

Losec worked miracles for my son, because he wouldn't take the beads with the zoton and had some side effects to it. I would think it hard to get them into a 9 week old, but different kids like different forms of the med, so if you think he will take the beads then you could try that also.

Also the gaviscon if given within 1 hour of the PPI will cause the medication to also become ineffective as the PPI actually needs an acidic environment to work. The longer you can space the gaviscon the better.

I am sorry that you sufferred so long with son number one, my son is 2 and a half and he has just gone off his meds, so I know how frustrating it can be when they 'don't grow out of it'. Hope that helps, good luck.