I don’t know what all Rx drugs are on their list (assuming they’re not making it up as they go) but I think the bigger point to see here is that any excuse will do. As an example there is the story about the guy who had all of his guns confiscated because his young son threatened another kid with a squirt gun.
This is the tip of the sword, several agencies gathering information on different areas of your life is now being assembled under your profile. You are no longer a citizen, you will be categorized, labeled, and assigned duties. Resist and some jack booted thug with no neck will be happy to show you who's boss.