The present investigation is concerned with the influence of the composition of food on the absorption of sulfameter. Six physically healthy patients each were given 2 g of sulfameter simultaneously with a high lipid, high protein and high carbohydrate test meal. This experiment was designed as a threefold crossover study, and there was a randomized assignment of patients to the different conditions. The results show that sulfameter is significantly better absorbed when administered with a high lipid meal than when given with a high protein or high carbohydrate meal, demonstrated by the areas under the serum concentration curves (AUC), by the peak serum concentration and by the cumulative renal excretion.