It looks like the answer is no. From page 2 of the FAQ:
Q: Can the keeper use Uncontrollable urges to make an investigator attack
another Investigator with a weapon?
What about spells?
A: No. This only
allows him to use a spell, equipment,
artifact or tome card. If he forces an
investigator to cast a spell, he must
choose a legal target. To clarify, if
a spell says “choose a Monster”, it
may not be used against an
investigator (even if playing Story
5). As another example, the Keeper may
not force an investigator to use the
“Sedative” equipment on an
investigator who does not have a
Trauma card.