you can buy it without prescription just make sure that it is pure taurine, some companies add fillers. BTW there are many studies that show taurine is not toxic or dangerous, what they don't use the pee out. I say better to be safe than sorry. I just add a sprinkle on their food in the morningTo additionally supplement with taurine, Does it have to be prescribed by the vet or you can just add it to the kitty diet?
Thank you!!
Taurine Deficiency in Cats | NASC LIVE
Taurine: Please Make Double Sure Your Cat Gets This Daily
here is one that has no additives L-Taurine 1000mg ~ 200 Capsules - No Additives ~ Naturetition Supplements