Which medication or hormone can be used to prevent reactive hypoglycemia from showing up?

Talk to your doctor.

@sibi I work in healthcare (administration) and I think this question is unlikely to be answered in a helpful way on this site. I don’t know the answer to your question, but even if I were an MD and had the answer, I still probably wouldn’t respond because there are potential legal implications, and would instead encourage you to speak with a doctor who understands your unique health history and any active medical conditions that may be related to your current condition.

Generally, when it comes to specific healthcare questions that are of this complexity, it’s best to consult with a licensed healthcare provider. I wish I could be more helpful than that. Best wishes.