Vitamin B6 injection is a vitamin supplement for the treatment or prevention of vitamin B6 deficiency, for the prevention and treatment of isoniazid poisoning, for vomiting due to pregnancy, for vomiting due to cancer chemotherapy drugs, and for vomiting due to radiation sickness, for seborrheic dermatitis, for neonatal hereditary vitamin B6 dependence syndrome, and for the supplementation of vitamin B6 in patients who have an increased need for vitamin B6 due to intravenous infusions or who are suffering from malnutrition and gradual weight loss. 6. Vitamin B6 supplementation for patients who can only rely on intravenous infusion for nutrition or who suffer from malnutrition and gradual weight loss due to low food intake. 7. Vitamin B6 injection can also be used to supplement certain physiological conditions or diseases that lead to increased vitamin B6 needs, such as pregnant and lactating women, hyperthyroidism, post-gastrectomy, burns, congestive heart failure, long-term chronic infections, fever long-term hemodialysis, malabsorption syndrome with hepatobiliary system diseases (e.g. alcoholism with cirrhosis), intestinal diarrheal diseases, and diseases caused by inborn metabolic abnormalities, etc.