Medication Summary
New fasciolicides are being used in small numbers of children with encouraging results and minimal toxicities. The best studied agent, bithionol, is available from the CDC Drug Service (see CDC Drug Service: Bithionol). Despite limited data on their use and safety in US children, these new fasciolicides are the DOC because of the poorer efficacy and greater toxicities of older, more familiar agents. The Medical Letter (2000 Edition) and many experts recommend triclabendazole, a veterinary drug not approved for human use in the United States, as the DOC.[19]
Anthelmintics
Class Summary
Parasite biochemical pathways are different from the human host; thus, toxicity is directed to the parasite, egg, or larvae. The mechanism of action varies within the drug class. Antiparasitic actions may include the following:
- Inhibition of microtubules causes irreversible block of glucose uptake
- Tubulin polymerization inhibition
- Depolarizing neuromuscular blockade
- Cholinesterase inhibition
- Increased cell membrane permeability, resulting in intracellular calcium loss
- Vacuolization of the schistosome tegument
- Increased cell membrane permeability to chloride ions via chloride channels alteration
Bithionol (Lorothidol, Bitin)
Inhibits oxidative phosphorylation in the parasite, leading to blockade of ATP synthesis. DOC because of its safety and effectiveness for Fh and Fg. Most supporting data are from developing countries. It is a phenolic compound structurally related to hexachlorophene. Available from the CDC.
Triclabendazole (Fasinex)
Recent reports suggest this veterinary drug is safe, well tolerated, and effective in adults and children. It remains the second DOC until further data accumulate, supporting its preferential use. Binds selectively to fluke tubulin, disrupting microtubule formation and function. As of 2009, is unavailable in the United States.
Praziquantel (Biltricide)
Although generally safe and effective for other trematode infections, praziquantel appears much less efficacious against Fh and Fg. Because it is readily available and more familiar than triclabendazole (Fasinex), it is the third DOC. Reserve use for situations in which the first and second DOC are unobtainable. Praziquantel increases permeability of the trematode tegument to calcium, causing contraction of the parasite muscle.
Corticosteroids
Class Summary
Corticosteroids may ameliorate the treatment course in children with severe acute phase infection.
Prednisolone (Pediapred, Delta-Cortef, Econopred)
A short course that is given for 2 d preceding fasciolicidal therapy in children with severe acute phase infection is reported anecdotally to ameliorate the course of the illness and to decrease fever, pain, pruritus, and toxicity.
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