The stress of captivity coupled with a closed environment predisposes to a heavy internal parasite burden in reptiles. Many common endoparasites of reptiles have direct life cycles and can multiply to staggering numbers. Every effort must be taken to rid reptiles of parasite burdens, and the environment of intermediate hosts.
Pathogenic trematodes infect the vascular system of turtles, and the oral cavity, respiratory system, renal tubules, and ureters of snakes. Chemotherapeutic agents have not been effective in eliminating these parasites, although praziquantel administered at 5-8 mg/kg, IM or PO, has shown some promise.
Tapeworms are found in all orders of reptiles but are rare in crocodilians. Reptiles may act as the definitive, paratenic, or intermediate hosts for a large number of species.
Although most species of tapeworms are generally nonpathogenic in wild reptiles, weight loss and death have been reported. The complex life cycle of cestodes and restricted geographic range of intermediate hosts limit the number of cases in captive reptiles. When present, proglottids may be found around the cloaca, or typical cestode ova may be isolated from feces. Treatment is with praziquantel at 5-8 mg/kg, IM or PO,
http://www.merckvetmanual.com/mvm/in.../bc/171410.htm
I'll keep researching for you, but this is all I found so far.