Barberry root bark, used as an antibiotic for treating infections, and as a decoction for treating infections, pinkeye and eye infections in animals and people.
people=1 tsp/cup for decoction,[decoction= simmer for 20 min -then add water to bring up to origional volume] loading dose = 1 tsp [1 cup] 2x first day, after that 1/2 tsp/day 5 to 7 days - use above formula for eye drops for pinkeye at least 3x/day, [should be a 3 day treatment time], but-- very effective.
Barberry kills most strep infections, [including strep throat, but is more effective against strep throat ,if equal parts slippery elm inner bark is added to decoction]
When I have a sick rabbit I like to put some [1 tbl spoon] barberry in the pen separate from the feed so they can eat as much as they want/need with out sorting it out of the feed. -it usually lasts them about a week before they clean it all up.