There are LOTS of animal products that contain praziquantel.
I talked with someone here the other day who took a horse drench to get rid of tapeworm. The horse drench contained ivermectin and praziquantel. He had a dcctor's supervision/reluctant support. He was quite unwell for several days, but okay now and much better. Tapeworms gone.
If you want I can send a copy of what he said he did.
Someone said to me: find a doctor who does travel vaccinations and treats people who return from overseas with health problems. Maybe you can keep looking for a competent doctor.Most of them seem hopeless....