Naxcel 100mg/ml Suspension for Injection for Pigs Dosage and administration 5 mg ceftiofur per kg body weight (1 ml per 20 kg body weight) administered once in the neck by the intramuscular route. Shake bottle vigorously for 30 seconds or until all visual settlement has been resuspended before use. Ensure that body weight is determined accurately to avoid under-dosing. It is recommended to limit the injection volumes to a maximum of 4 ml at any one site.