Check if its OK. It seems to be bugged.
It seems we are missing an dol fix for that: http://www.dolserver.net/search.php?keywords=pulsing+cure+disease please check that. I´ve tried the pulsing cure disease/pooson I and II. The CureDisease spell has a spellduration in the database but it won´t stop after the duration is done.
Fixed and live.