I would not use something like that. You cannot prevent a disease before one gets it. Those drugs are wormers, antibiotics, and sulfa antibiotics, anti-protozoan drugs, and who knows what else. Dosages are not even listed. Treating with something like that unnecessarily will cause disease and worm-resistance. Get healthy chicks from a hatchery or feed store, and don’t buy from other people, at flea markets, poultry sales or shows, or swap meets. When an illness strikes, look at symptoms and figure out what is wrong with testing, by symptoms, or with a necropsy, then try a proven medicine for that particular illness. Most drugs are not approved for poultry, but some may be used off-label with an appropriate egg withdrawal time.
