I don’t understand what you mean. Corticosteroids can cause adrenal insufficiency in the long term. Overdosage of Flonase can cause it.

People should be wary of what they intake and should seek professional help on whether they should be taking such medication for such prolonged time. OP was curious and I gave him the answer.

However they interpret my answer is up to them.

Edit: also if you search it on google you’ll see that the is indeed happened before from taking too much of Flonase.