Most recommend Wazine, then in 2 weeks follow up with Ivermectin or Safeguard. It means you'll go 24 days w/out eggs but the birds will be better off. I no longer use the wazine personally that often since it really only kills the roundworms. I only use that once a year now, but I do use Eprinex often, which does not get tapeworm. It gets complicated since none seem to get all types of worms.