Wazine only treats round worms, and other worms that cannot be seen sometimes affect chickens. I like Valbazen (albendazole) since it gets most chicken worms, including cecal worms, capillary worms, gapeworm, and tapeworms with multiple day use. Some use SafeGuard Liquid Goat Wormer (fenbendazole) as well. All of these are not approved for poultry, but are commonly used to treat chickens. Very few drugs are approved officially in chickens due to egg or meat withdrawal. FARAD has a list of approved medicines and it is small. Most people use a 2 week withdrawal after worming medicines are withdrawn. I believe that Wazine has a 17 day withdrawal. You can contact your local vet for testing of some fresh droppings to see if you have a worm problem, and to know what kinds. Since you know you have roundworms for sure, then you could use any of the above.
Edited to provide generic names.