The purpose of this study was to compare the pharmacokinetic and bioavailability profile (rate and amount of absorption into the bloodstream) of a test formulation of Ivermectin solution 1 mg/ml with a marketed reference formulation of Ivermectin 3 mg tablets when taken after a standard meal. The study is designed in accordance with the EU Note for Guidance on the Investigation of Bioavailability and Bioequivalence 2001.

Ivermectin is an antiparasitic medicine (i.e. a medicine used to eliminate parasitic worms) for oral administration, and is approved in the US and some other countries in a tablet form. A new liquid formulation of ivermectin has been developed to facilitate dosing. This is a single dose, randomised, crossover study in healthy adult male and female volunteers, with doses taken 20 minutes after a standard breakfast. Doses will be separated by washout period of at least 14 days. Twenty-one blood samples will be taken from each volunteer over 144 hours in each period. Concentrations of Ivermectin in plasma will be measured using a validated chromatographic assay (LC-MS/MS). Standard pharmacokinetic parameters will be obtained and bioequivalence on the basis of rate and extent of drug absorption will be assessed.

Inclusion Criteria:

• Healthy male and female volunteers
• Aged between 18 and 50 years
• BMI </= 30 kg/m2
• Weight between 50 and 90 kg
• Non-smokers, or smokers of fewer than 10 cigarettes per day
• Clinically normal medical history
• Clinically normal findings on physical examination
• Clinically normal blood pressure ( >/= 100/60 for males; >/= 90/50 for females; \