In the early stage, you need to feed 0.5-2 tablets of vitamin b1 every day. It can be 0.5 tablets or one tablet at a time, once a day. After another one to two weeks, it can be changed to indirect feeding. Vitamins are divided into: oral and injection. Please check the instructions when taking medicine. In addition, you should buy vitamin B1 specially designed for pets. Otherwise, the cat will not be able to absorb it and it will be useless.