MEDICINE: Well, fly agaric is known for its poisonous and psychoactive effects, but the spores were small enough that even getting that big an effect is rare. You'd get ... let's see ... some irrational behavior, including contradictory conclusions ...
MEDICINE: ... unwarranted mischief ...
MEDICINE: ... mild paranoia ...
MEDICINE: ... and excessive rage.
REIMU & MARISA: Ah.
ALICE: What about Yukari and my mom?
MEDICINE: Presumably, what happened to them was whatever they wanted. As for the magical effects, I have no idea, because whatever you and Shinki did, it completely wiped all traces of it out.
MARISA: There were these weird spirits that seemed to be sendin' us commands.
MEDICINE: ... Okay. That's certainly no weirder than some of the other Incidents you've dealt with in the past. In any event, I'm going to prescribe a medicine intended to stimulate your immune systems, one kind for humans and one for youkai. You'll feel really sick for an hour, but you shouldn't actually throw up or anything, and afterward you'll feel perfectly fine. Just rest the whole time.
CIRNO: Um, what about me?
MEDICINE: You won't need any, but you should just stay here and rest anyway. In fact, if you don't mind, Marisa, you should all just stay here.
MARISA: Yeah, that's fine.
REIMU: That works. And could you do me a favor, Medicine? Let me write a note for you to leave at the Shrine ...