I'm pretty sure it could be cast on both party and enemy.
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It was a great enfeeble if you could land it on a mob that mostly casts spells, since they stop casting and be forced attack. I always had a hell of a time landing it though. It was useful as a buff with characters who couldn't cast spells(or just crappy ones) in the first place(FF4 melees, Umaro from 6, etc), but you lost the ability to do anything else with them.
Charybdis a bad example? Not really, I will grant that at 75 you only needed 3 people to kill it but it was not intended to be killed alone. I just used Charybdis as an example because its one of those fights that good ol' Avesta was famous for is all. The point is RDM was, for the longest time before updates made certain jobs more flexible, the only job that could Solo larger NMs and it simply wasn't supposed to or I don't think SE intended us to at least