The Malaysian government has built up pharmacist-managed DMTAC in healthcare institutions to help people with diabetes take their medications more regularly and better control their blood sugar levels. The objective of this research is to assess the impact of pharmacist participation in a DMTAC program on patient glycaemic control across 14 government health clinics in Kuala Lumpur and Putrajaya. This multi-centre retrospective study gathered DMTAC patient demographics, medication regimens, glycated haemoglobin (HbA1c) levels, Modified Morisky Medication Adherence Scale (MMMAS) data, and percentages of comprehension regarding their medications (derived from information extracted and analyzed from their DMTAC booklets). We used IBM SPSS Statistics Version 21.0 to look at the data. This research included fifty-six patients. The mean HbA1c decrease (SD) between the pre- and post-intervention groups demonstrated a statistically significant improvement of 1.0% (1.70) (p<0.001), reducing from 10.7% (1.51) pre-intervention to 9.7% (1.75) post-intervention. The postintervention group's mean medicine knowledge score was 97.6% (7.32), which was a lot higher than the preintervention group's score of 92.2% (13.61) (p = 0.005). The mean MMMAS for the postintervention group was 7.4 (1.19), which was a lot higher than the mean MMMAS for the preintervention group, which was 6.5 (2.33) (p = 0.001). This research showed that T2DM patients who were part of a pharmacist-managed DMTAC program had better glycemic control, understood their medications better, and followed their treatment plans better.