following a single dose of co-trimoxazole or co-tetroxazine , the plasma and urine levels of intact trimethoprim ( tmp ) and sulphamethoxazole ( smz ) and of tetroxoprim and sulphadiazine ( sdz ) were determined in six geriatric patients in a cross-over design by high pressure liquid chromatography .
C0041044
co-trimoxazole
C0038689
sulphamethoxazole