Figure 1From: Ivermectin: does P-glycoprotein play a role in neurotoxicity?Chemical structure of ivermectin. Ivermectin contains not less than 93.0% of 22,23 dihydroavermectin B1a (R = CH3) and the sum of B1a and B1b (R = C2H5) is not less than 97.0%. B1a, and not less than 97.0% of 22,23-dihydroavermectin B1 (B1a + B1b).Back to article page