Evaluation of the bioavailability and safety of one oral preparation containing fixed dose 18 mg ivermectin (IVM 18 MG TABLETS, LICONSA S.A., Spain) or two oral preparations containing fixed dose 18 mg ivermectin (IVM 36 MG TABLETS, LICONSA S.A., Spain) vs. reference dosing (weight based) of reference drug containing 6 mg ivermectin (REVECTINA®, Abbott Laboratórios do Brasil Ltda, Brazil) in fasting conditions. A monocentric, open, randomized, single dose, three-period crossover trial in healthy volunteers.