I "loaned" a girlfriend a 22mg vial of compound (not grey) tirz to try while she decides whether or not to get on it. (if she does, she can pay me back a vial, and if she doesn't, no big deal, I have so much grey in my freezer.) I've done it before for girlfriends who are hesitant to pull the trigger and just want to see if it agrees with them, and they always wind up getting their own and giving me one back,
I talked with her, we pulled the risks/side effects page from one of the pharmacies, I made sure she was aware of all of it, and I showed her the titration schedule. Made sure she knew that it was 10 units for 2.2 mg to start (I know 2.5 is fine, but it's easier to remember the 10 units, and that's what Southend has on their sheet.) Let her know she could text me if there was anything she didn't remember and/or couldn't find.
She went home, forgot the units, dosed WAY too high, and was ill.
I know her to be smart, capable, thoughtful, and competent. And holy shit am I glad it wasn't worse than it was.