HomeAnswersDiabetologyblood sugar levelsIs it possible to have post prandial blood sugar lesser than fasting blood sugar level?

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

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The following is an actual conversation between an iCliniq user and a doctor that has been reviewed and published as a Premium Q&A.

Answered by

Dr. Hariharan

Medically reviewed by

Dr. Vinodhini J.

Published At February 22, 2020
Reviewed AtJuly 12, 2023

Patient's Query

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?

Answered by Dr. Hariharan

Hello,

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, 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. 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 mg/dL), we have to alter the drugs and dosage. I hope this helps.

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Hariharan

Dr. Hariharan

Diabetology

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