Wrangling foal treated for 10 days still lethargic and not eating well

I have a 5 month old colt that was doing very well. About 2 weeks ago got lethargic and is barely eating. .he has been treated for 10 days with 2 different antibiotics. I still can not see where he is doing better. Still lethargic and not eating well. Any thoughts???

Take him to the nearest vet hospital for supportive care and diagnostics. You may want to message the mod to move this thread to the breeding forum.