no advice im afraid, as was never prescribed it for Jess... we had Gaviscon and something called Carabell or something which was a thickening agent we put in her milk - i think it was a cow and gate product that we were prescribed on prescription.
hate to say it but none of it worked! If using SMA gold - try switching formula.... we switched Jess to progress milk at 8 months and the sick stopped straight away - too much co-incidence if you ask me!
DS2 was on staydown from about 3 mths to 9 mths (he's now 10 1/2 mths). You can get it on prescription altho your gp may have to double check as i think it's not been on their list for long. I bought about 4 tins before the chemist told me i didnt have to pay if i got a prescription for it. It wasn't a miracle cure but he did seem better on it. When he first started on it he did get a bit constipated so I had to give him extra sips of water in between.
I did find that with the staydown milk but then i figured if he was drinking 4oz and not puking instead of having 6oz and puking loads then he was actually keeping more in him with the staydown if that makes sense!