Q. My FBS is 140 mg/dL, whereas my PPBS level drops to 72 mg/dL after taking medication. Why?

Answered by
Dr. Hariharan V
and medically reviewed by Dr. Vinodhini. J
This is a premium question & answer published on Feb 21, 2020 and last reviewed on: Feb 25, 2020

Hello doctor,

I am diabetic and hypertensive. I also have arthritis. I am taking Gemer-1, Folvite, Febituz, Methotrex weekly once, Ecosporin and Repace 25. My fasting blood sugar level is 140 mg/dL and on taking Gemer-1 my postprandial blood sugar is 72 mg/dL. Why this happens?

Dr. Hariharan V

Diabetology General Medicine Internal Medicine Nutritionist


Welcome to icliniq.com.

Yes, it happens. In a diabetic, fasting blood sugar usually results from a combination of factors, the two most important being,

1) What you ate the day (or night) before and how high your blood sugar spiked. If you have very high blood sugar the night before, you should expect your fasting blood sugar to be elevated. Sometimes an eight-hour fast is just not long enough to bring down the blood sugar.

2) Dawn Phenomenon is common in diabetics, and it is when hormones that you produce in the morning cause your liver to release more glucose for energy. Either way, higher fasting levels result. Often Dawn phenomenon and high blood sugar from the day or night before work with each other. When you eat, the liver stops pumping out so much glucose, and postprandial blood sugar can drop, which is what happened to you. My suggestion is to do a pre-dinner sugar and see what is your blood glucose level before dinner. If it is high (>130), we have to alter the drugs and dosage.

I hope this helps.

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