Puerarin promotes blood circulation. And most puerarin is used by injection. There is something wrong with the medicine your father used. Even if it is not fake, the side effects are quite high. It is also possible that your father has been fat and weak for a long time.
Explanation: Diabetes can only be alleviated by insulin and western medicine.
I'll introduce you to two drugs. If your father's blood sugar is high before meals, you can use acarbose. Metformin can be used for postprandial hyperglycemia. If your father is seriously diabetic, I suggest you go to the hospital for insulin.
Note: What I introduced to you is only the popular drugs. Because diabetics have to take many kinds of drugs (usually before and after meals), it depends on what's wrong with your father. Different diseases use different medicines. So it says two kinds of medicine for you. (These two drugs are suitable for ordinary diabetics. )
However, for the sake of safety. You'd better take your father to the hospital for a check-up to see what's wrong and how sick he is now. If it is serious, consider whether to take insulin (the effect is good, but the price is very expensive). Still have to go to a regular hospital or pharmacy to buy medicine to avoid encountering counterfeit drugs again. It doesn't matter if the money arrives, but the health of the family is no joke.
But fortunately, you found this problem in time, otherwise the consequences can be imagined. After all, the internet is just a suggestion for you. You'd better go to the hospital to find out. After all, it's your father. It doesn't matter if you try harder.
Finally, I wish your father a speedy recovery and full of vitality.