Allium Cepa homeopathy has been a wonderful help with my cat's allergies. He gets bouts of sneezing with more long, stringy sneezes than I ever imagined a cat having. But, I just read about onion toxicity in cats. I just give him a half of a tablet at a time, but we just went through a long stretch of about 10 days on the medication before he cleared up. Have I poisoned him? What should I do?