Notes: Ivermectin-d2 is intended for use as an internal standard for the quantification of ivermectin (Item No. 35518) by GC- or LC-MS. Ivermectin is a mixture of the anthelmintics ivermectin B1a (Item No. 18768) and ivermectin B1b (Item No. 23824).{39419} Formulations containing ivermectin have been used in the treatment of parasitic roundworm infections.