Metformin is often the initially prescribed medication to manage diabetes. Blood sugar levels are not immediately reduced by metformin. A medication's effects usually begin to be felt within 48 hours of taking it, and the most significant effects typically take 4–5 days to manifest. Depending on the dosage, the timing will vary. After a meal, fast-acting insulin (also called rapid-acting insulin) lowers blood sugar within 15 minutes of injection. Without medication, lifestyle changes lower blood sugar on a slower basis, usually taking weeks of sustained changes for lowered blood sugar to make lasting changes to blood sugar levels. However, in the immediate aftermath of physical activity blood sugar will temporarily lower. The more strenuous your workout, the longer it will affect your blood sugar. It is possible to have low blood sugar four to eight hours after exercising. Diabetes management is available at Mesquite Medical Clinic. For more information call us today or book an appointment online. We are conveniently located at 5115 N Galloway Ave #203 Mesquite TX 75150. We serve patients from Mesquite TX, Garland TX, Dallas TX, Rowlett TX, Balch Springs TX, and Plano TX.