The main effect of Vitamin B1 Tablets is to prevent and treat diseases such as beriberi and peripheral neuritis caused by vitamin B1 deficiency. Vitamin B1 Tablet is an over-the-counter drug whose main ingredients are vitamin B1 and excipients. Vitamin B1 has the ability to inhibit the activity of cholinesterase, and when it is deficient, the activity of cholinesterase is increased, and the hydrolysis of acetylcholine is accelerated, which can lead to impaired nerve impulse conduction, thus affecting the function of gastrointestinal and myocardial muscles. Therefore, when the human body vitamin B1 deficiency can lead to neuritis, indigestion, beriberi, lactic acid accumulation and other adverse reactions. The main effect of vitamin B1 tablets is to prevent vitamin B1 deficiency, so as to avoid the production of beriberi, neurasthenia, dyspepsia and other adverse reactions, and at the same time the human body after the occurrence of deficiency of timely supplementation of vitamin B1, can play a role in improving the related symptoms. However, overdose of vitamin B1 may cause headache, fatigue, irritability, loss of appetite, diarrhea, swelling and other adverse reactions, and at the same time, vitamin B1 should not be combined with tannin-containing traditional Chinese medicines and food, to avoid weakening of the medicinal properties of the drug, affecting the supplementation of vitamin B1. Contraindications are not clear. Drug use should be under the guidance of a doctor.