From my personal experience over 10 years, I have taken my injectable packs and tablets on multiple airlines (including Qatar).

Never have I had a problem. I usually tell them at X-ray what I'm carrying, and most times they have have not even inspected closely. The most notice was taken in India with my actual injector as it looks like it could fire projectiles at first glance but even they were cool after an explanation.

I carry my prescriptions/labels with me but I've never had to show them. Likewise I've stopped telling the FAs as they never seemed to care.

Hope that helps! Good luck!