Whether it's a good idea to take the stuff in the first place is another thing - for me I've already had two vaccines, so why would I? I prefer the idea of a couple of vaccines than regular dosing with a fairly heavy anti parasite medicine (and possibly bits of my intestine coming out in my poo (though that might be dosage related I guess)
(yeah I've had 'horse' ket, and even 'elephant' ket (mostly human stuff though)- all worked the same really (enantiomers aside ('s-ket')) (though ironically, they don't actually give the proper ket to horses as they get too skittish afterwards - they give a less 'interesting' variation with added valium). I'm not embarrassed - had some reall good times on the stuff (with the right friends), but best left occasional as it can be habit forming for some. But yeah, don't do drugs kids.