has part has role independent continuant antiviral agent insecticide antinematodal drug antineoplastic agent antimalarial dermatologic drug organic molecular entity mixture ivermectin A mixture consisting of ≥ 90% 22,23-dihydroavermectin B<small>_1a</small> (R = Me) and ≤ 10% 22,23-dihydroavermectin B<small>_1b</small> (R = H). A semi-synthetic derivative of abamectin, it is used as a broad-spectrum antiparasite medication, particularly against worms (except tapeworms), although it is also effective against most mites and some lice. CHEBI:6078 22,23-dihydroavermectin B1a 22,23-dihydroavermectin B1b antileishmanial agent scabicide