Compositions and methods for inhibiting and/or sensitizing or re-sensitizing a parasite to an antiparasitic drug are provided. The compositions can comprise a an arylphenoxypropionate derivative, an aryloxyphenoxyacetate derivative, an aryloxyphenylacetate derivative, one or more substituted quinols, or a pharmaceutically acceptable salt, hydrate, or prodrug thereof, or a combination thereof in an amount and formulation sufficient to sensitize the parasite to the drug, treating infection of a patient by a parasite with a drug, or to prevent symptomatic infection of a patient by a parasite with a drug.