Epalrestat tablets generally need to be taken continuously for one to three months, if the condition requires long-term use under the guidance of a doctor. Epalrestat tablets are used in the treatment of diabetic peripheral neuropathy, generally slow to see the effect of the drug time is longer, generally need to be taken for one to three months to see the effect of the drug, such as continuous use of three months after the condition is significantly improved and under control, under the guidance of the doctor can be discontinued, such as the condition of the disease improves but still need to treat the need for prolonged use of the drug time. The drug is damaging to the liver and regular liver tests are required for long-term use. Adverse reactions include allergy (itching, erythema, etc.), digestive system (nausea, vomiting, diarrhea, etc.), and liver damage (elevated bilirubin, etc.). If there is no significant improvement in the condition after three months of continuous use, it is necessary to change to other drugs under the guidance of the doctor. The urine will be brownish red after taking the drug, which is normal. Pregnant women, lactating women and allergic persons should be cautious. Consult your doctor before taking the drug, do not self-medicate to avoid adverse consequences.