The Ring of Free Action also protects against stun, unlike the spell. And in certain installs, Arbane's Sword also protects against stun, and Mazzy's sword always does. Finally, mages can use Spell Immunity: Conjuration to block Symbol Stun, if not other sources of stun.
I believe Berserker rage also grants immunity to stun, as does the Slayer form. But usually Chaotic Commands is the simplest way.
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That said you can use Free Action to cure stun. You just can't prevent it with it (at least not in BGEE or BG2EE).
I believe Berserker rage also grants immunity to stun, as does the Slayer form. But usually Chaotic Commands is the simplest way.
Otherwise, remove paralysis actually removes stun effect.