A blood sugar level of 250 mg/dL is high and requires prompt medical attention. Your father should see a doctor as soon as possible for proper evaluation and to determine the most effective medication. Depending on his overall health, the doctor may prescribe oral diabetes medications such as metformin, insulin, or a combination, along with dietary changes and regular exercise to help safely control his blood sugar. Do not start any medication on your own, and ensure his blood sugar is monitored regularly.

Diabetes is usually due to high blood sugar from how the body handles insulin, and it needs steady control rather than quick fixes. Follow a regular meal routine with balanced portions and limit sugary and refined foods so your blood sugar stays stable, and stay active with daily walking or light exercise to help your body use sugar more efficiently. Take your medicines as advised, check your blood sugar regularly to understand your control, and maintain proper sleep and manage stress, as they can affect your levels. Avoid skipping meals or sudden diet changes, as this can disturb control. If you feel unusual weakness, dizziness, or very high readings, talk to your doctor to adjust your plan for better control.