» Ivermectin Topical Solution is a topical solution in a suitable vehicle. It contains not less than 95.0 percent and not more than 105.0 percent of the labeled amount of Ivermectin, calculated as the sum of component H₂B_1a (C₄₈H₇₄O₁₄) plus component H₂B_1b (C₄₇H₇₂O₁₄). The ratio of the contents, H₂B_1a/(H₂B_1a + H₂B_1b), is not less than 90.0 percent.