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Hi, this is Dr. Gabby.
The tapeworm is not life threatening if you wait a few days for treatment.
But I would treat it sooner than Saturday if possible.
The medication we used to treat tapeworm is praziquantel. You can buy it at amazon.com and they may sell it at Petsmart. You would give one dose today and then another dose in 3 weeks.
Or, you can take the puppy into the vet tomorrow. I would think they would be willing to give you a dose of praziquantel to give her and then she can have her full exam on Saturday.
Does that help? Do you have any additional questions?