A ready-to-use, pale blue solution containing doramectin 5mg/mL. A highly active broad spectrum parasiticide for topical administration to cattle. It contains doramectin, a novel fermentation-derived chemical discovered by Zoetis. Doramectin is isolated from fermentation of selected strains derived from the soil organism Streptomyces avermitilis. It is formulated to deliver the recommended dosage of 500mg/kg bodyweight when given by topical administration at the rate of 1mL/10kg bodyweight.