Duphatrim IS Injectable Solution Presentation Duphatrim IS (Injectable Solution) is a clear yellow aqueous solution of trimethoprim and sulfadiazine for parenteral administration. Each ml contains the following active ingredients: Trimethoprim PhEur  40 mg Sulfadiazine PhEur 200 mg Chlorocresol (as preservative) Sodium Formaldehyde Sulphoxylate  1 mg 1 mg