FidoStar 60 mg Selamectin 12% (0.5 ml) can be used once in a month for the dogs over six weeks of age and weight between 5 and 10 kgs.FidoStar 120 mg Selamectin 12% (1 ml) can be used once in a month for the dogs over six weeks of age and weight between 9 and 18 kgs. For dogs above 18 kg, the dosage will be as directed by a Veterinarian.