If you try praziquantel which you can buy on line without a prescriiption be sure to repeat a 600mg dose 2 weeks to a month later to kill off stages that will hatch form the original kill. The adult worms are killed by the first does but you still have to get the cast's that spring up. You might even follow up with the same dose 3 weeks later, and then 6 weeks later (3 treatments in all).
My N.D. had me use 600mg split in half, 300 in the morning and 300 at bedtime. I weigh 140 lbs.
so adjust according to weight. You can also read dog Tapeworm
dewormer packages to calculate dosage per weight. You can use pet dewomer as well, but that is overpriced for the amount you would need to buy. You can find it in 600 mg doses online, usually from Canadian or other pharmacy's.