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Honestly, I don't know jennyjoan, I've been taking them for over 10 years and don't know what things would have been like without them.
I find the stemetil is good for the dizziness/attack side of things and the awful nausea and sick side. It's staved off a good few attacks for me. I'm quite "lucky" in that I seem to get a bit of a warning, it's quite distinct, before I actually really go on a drop attack, I get a really bad tummy, awful sick feeling and, of course the vertigo starts.
When I was switched to Cinnarizine I found I was still having to use some of the stemetil I had left over.
They are different drugs, mine come in a packet rather than a bottle but that might be dose/amount related and the way they dispense them in the pharmacy.