So Lily got poisoned and is about to die. She won't take her antivenom and stimpacks kill her. What should can I do? (I'm on PC)

Turn hardcoe off and let her get back up again?

When applying stimpacks, apply one to see if it subtracts health. If it does, just close out of the interface and then go back into it, and it should likely work normally, restoring health.

I've noticed that at times the first opening of the interface, stimpacks seem to adopt the "poison" effect, and closing and re-opening the interface returns the function to normal.

Grandma is sick?!! D:>

If at the time of being poisoned, their health is less than 150 minus poison resistance, a stimpak given by the wheel will kill them.

Stimpaks applied from the console won't.

I imagine that if someone made a simple mod that allows you to give antivenom and/or stimpaks in dialog and apply it in the result script would bypass the wheel/poison bug.

wound up having to send her off to the 38 to heal up. When I went to fetch her she was fine.

I actually added this to remote control companions when I saw all the people having problems with poison. You can cure their poison if you have antivenom, or just use a stim to heal them without the danger or it affecting their poison status.