Quote from wetbird on 02/23/10 at 5:18pm:

 
In people or fish?  If fish what species?

Praziquantal.  The trick is getting the medication to the worm to kill it.  Tape worms are intestinal, so the meds need to get in by ingestion.  Not easy to do.  If the fish eats well you can soak pellet foods in the medication or buy a medicated food.  Dosing the tank may work, but it will take a lot longer.
 
A faster dewormer is levamisol... but meds with that chemical specifically for aquarium use are hard to find.  Another option flubendazol.  Also very hard to find in an aquarium formulation.
 
Call me....

Jim,
as you may know you most likely contracted the tapeworm by eating food or drinking water contaminated with tapeworm eggs or larvae may be water from an infected tank. In order to prevent reinfestation stop eating contaminated food and drinking contaminated water. Keep checking your stool to make sure no more segments (proglottids) of the worm, as well as eggs, can be seen.
 
This is something you will have to do yourself. Good luck, I hope you get better soon !

Oh great...now everyone's a comedian.  
Hey Austin, did you hear about the Indian who opened a used clothing store called Whose Sari Now?

wetbird left on vacation for a week and left guess who in charge of feeding his fish and I think a cat.
Who's sorry now?
 
just kidding the cat was fine, after he learned to catch the fish he wasn't hungry anymore.
 
anyone know the cure for a cat with tapeworm?