Drontal is effective in the control of gastrointestinal Roundworms and is also effective against Hookworms and Whipworms, all of which are present in the UK, in dogs and puppies. Puppies should be treated at 2 weeks of age and every 2 weeks until 12 weeks of age. Thereafter they should be treated at 3 monthly intervals throughout their lifetime. This product may be administered whilst the bitch is lactating but we recommend that you consult a veterinary surgeon before treating a bitch whilst she is pregnant. Dosage guide 1ml Drontal Puppy Suspension per 1kg of bodyweight, please refer to the data sheet for further details.