How long you should stop taking vitamin B6 depends on what kind of disease the vitamin B6 deficiency is causing and the severity of the disease. Vitamin B6 belongs to the B vitamins, which are water-soluble and are generally recommended to be taken after meals for better results. Water-soluble vitamins need to be constantly replenished, and normal people who consume enough dairy products, poultry, and meat generally do not have vitamin B6 deficiency. if vitamin B6 deficiency can lead to a variety of diseases, the common clinical ones are stomatitis and nerve damage. For the treatment of stomatitis, regular vitamin B6 taken orally for about 3-5 days can usually be discontinued. However, for vitamin B deficiency caused by nerve inflammation should be used for at least about 1 month, and how long it takes to increase or shorten the course of treatment as appropriate to the patient’s condition. Vitamin B6 can also be used in the treatment of isoniazid poisoning, and can be given intramuscularly or intravenously in the acute phase.