Gliclazide tablets are effective in about 30 minutes after taking in some patients, but it is not absolute, and is related to the patient’s condition and physical fitness and other factors. Gliclazide tablets are mainly used for the treatment of type II diabetes mellitus. How long it takes to take effect can not be clearly judged, mainly based on the patient’s condition and physical fitness and other factors, clinically, some patients will take effect after 30 minutes of taking the drug, 3~4 hours can reach the peak plasma value, the half-life is 10~12 hours. Adverse reactions of gliclazide tablets include: mild nausea, vomiting, epigastric pain, constipation, diarrhea, erythema, urticaria, thrombocytopenia, granulocytic leukopenia, anemia, and other symptoms, which usually disappear on their own after stopping the drug. In addition, patients with hepatic and renal insufficiency are prohibited, patients allergic to sulfonylurea drugs are prohibited, this drug is not applicable to patients with type I diabetes mellitus, pregnant and lactating women should not be used, and the use of children’s medication is not clear. If you need to use Gliclazide tablets, please consult a professional doctor, follow the doctor’s instructions for standardized treatment, do not blindly use their own medicine.