Crack Theory (Not to be taken seriously)

 
The White Dove cold medicine is needed to complete the antidote.
Pros: The temporary antidotes already need the user to have a cold to work anyways, Miyano created medicine gets to fix what they inadvertently started.
Cons: The medicine is outdated and I'm pretty sure that's not how pharmaceutical stuff works. (Then again, I don't know how it works anyways, so w/e)