My understanding is that the formula was changed to comply with EU regulations. It disappeared from the market for about a year while it was being reformulated. I never tried the old formula, but I'm quite pleased with the current one, so I don't feel the loss.
You can get it much cheaper in the supermarket or super drug, that's where I will be going next time but for convenience and next day delivery this time I used Amazon, can hardly wait! I hope it's as good as I remember it being.
Euthymol is excellent it is strong flavoured and out performs most of the new fancy ones that make faulse claims, I have used it on and off from being a kid. I use the blanx White shock at the minute because it is supposed to be non abbresive but in all honesty I think Euthymol out performs it !