I haven't seen it in the UK but will have to look into it for myself - I am on a regime of Solgar Psyllium, Solgar Billions probiotics, Udo's choice oil and Aloe juice for IBS - after trying various prescribed meds, including antidespressants (Citalopram), this is working best for me. I am trying to find a source of a breakthrough probiotic called Bifidum Infantis but it seems almost impossible to buy here except as part of a children's probiotic called ABC Dophilus, made by Solgar. The other snag is it seems P&G are the only makers of this probiotic and I don't buy any of their products (knowingly).
Sorry to bring my own issues into this but I think trying to regulate the gut rather than using laxatives is the way to go - and probiotics can be helpful, along with Psllium which is now added to some cat foods. I prefer Solgar as it is 100% pure and non-irradiated.
I know you have to be very careful with laxatives if a cat (or human
) has megacolon.