eng Oriental Scientific Publishing Company Biomedical and Pharmacology Journal 0974-6242 2022-12-20 15 4 2399 2402 10.13005/bpj/2577 46265 article Mansha Dua 1 Suguna Sajja 2 Seeresha 3 Supriya Priyambada 4 Dr. Pinnamaneni Siddhartha institute of medical sciences and research foundation, Chinnavutapalli, Andhra Pradesh, India Department of Pharmacology, Gandhi medical college, secunderabad, Telangana, India Department of general medicine, Dr. Pinnamaneni Siddhartha institute of medical sciences and research foundation, Chinnavutapalli, Andhrapradesh, India Department of pharmacology, Dr. Pinnamaneni Siddhartha institute of medical sciences and research foundation, Chinnavutapalli, Andhra Pradesh, India Background-Diabetes mellitus (DM) is a common endocrine disorder. Prothrombin time (PT) and activated partial thromboplastin time (aPTT) are basic haematological indices to screen the coagulation status. Due to persistent hyperglycemia, glycation of proteins involved in clotting mechanism takes place which reduces their availability, thus affecting the clotting capacity. Method- An analytical observational study was conducted on 180 subjects by measuring their PT and aPTT, to observe the effect of antidiabetic drugs on blood coagulation and to compare these indices between treated and untreated diabetics. Results- A significant elevation of PT and aPTT in untreated diabetics when compared to controls was seen (PT (p<0.001); aPTT (p<0.05)). The effect of antidiabetic drugs showed normal mean values of PT and aPTT in treated group (p>0.05). Conclusion- the study revealed that significant elevation of  PT and aPTT in untreated DM than non diabetic controls may be interpreted as tendency to bleed while effect of anti diabetic drugs shows normal mean values of PT and aPTT in treated group. This suggests that antidiabetic drugs either in combination or monotherapy may normalize PT and aPTT by reducing glycation of hemoglobin. Therefore, routine examinations of PT and aPTT are important to assess coagulation impairment in diabetes mellitus so as to prevent cardiovascular disease. https://biomedpharmajournal.org/vol15no4/effect-of-antidiabetic-drugs-on-blood-coagulation-in-diabetic-patients/ Antidiabetic Drugs  blood coagulation  Diabetes  HbA1c  PT aPTT