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an·ti·fi·lar·i·al | \ -fə-ˈlar-ē-əl, -ˈler- 
\
\Medical Definition of antifilarial
: tending to destroy filarial worms or to inhibit their growth
By 1978, the Merck pharmaceutical laboratories had isolated an effective antifilarial antibiotic, called ivermectin, which was extracted from a species of fungus.— Stanley M. Aronson, The Providence (Rhode Island) Journal-Bulletin, 23 Oct. 2000 also : produced in response to filarial infection … 11% of U.S. service personnel who were stationed in filariasis-endemic regions of South Vietnam had antifilarial antibodies. — Wayne Melrose and Peter A. Leggat, Military Medicine, July 2005
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