Your high blood sugar level of 420 at night despite taking Fortyfitt could be due to several reasons:

• Medication Effectiveness: Fortyfitt may not be adequately controlling your blood sugar, or the dosage might need adjustment.

• Timing and Food Intake: Eating late at night or consuming high-carbohydrate meals can cause blood sugar spikes.

• Other Medications or Health Conditions: Some medicines or illnesses can affect blood sugar control.

• Stress or Illness: Physical or emotional stress can raise blood sugar levels.

• Incorrect Medication Use: Missing doses or not taking the medicine as prescribed can lead to poor control.

It's important to discuss this with your doctor promptly. They may need to review your treatment plan, check for other factors, and possibly adjust your medication or lifestyle recommendations to better manage your blood sugar levels.