In 2015 they came out with a new treatment for Fistulas that appears to really work, and often better than Cyclosporine. The new product is called :
IF YOUR PUP IS STRUGGLING WITH FISTULAS.....PLEASE TALK TO YOUR VET ABOUT THE POSSIBILITY OF TRYING TACROLIMUS OINTMENT
For severe cases, we initially give either high-dose prednisolone or cyclosporine, in combination with topical tacrolimus to control the lesions (Figures 1 & 2). Either prednisolone or cyclosporine works well. Prednisolone (0.75 to 1 mg/lb/day orally for two or three weeks; taper the dose over two or three months) is cheaper than cyclosporine but has more side effects. Owners who give cyclosporine (5 mg/kg/day orally on an empty stomach; taper the dose to every other day after six to eight weeks of therapy or when 80% resolution occurs) are usually pleased despite the higher cost.