The maximum dose of vitamin B1 to take is usually just not more than 30 milligrams per day. The dose of vitamin B1 is 10 milligrams per capsule, and patients are generally advised to take it three times a day, and it must be taken in accordance with the recommended dosage without overdosing, so that the dose should not exceed 30 milligrams per day. Vitamin B1, if overdosed, may cause headache, irritability, fatigue, swelling, diarrhea, and lack of appetite and other symptoms, need to pay attention to allergies are prohibited, children, pregnant women and lactating women need to take under the guidance of a specialist. It is recommended to use the drug under the guidance of a specialist to avoid abuse and overdose. If there is any discomfort, go to the hospital in time.