A medicament contains a slow-release composition of ibuprofen as a racemate, a mixture of racemate with its enantiomers, a pseudoracemate (mixtures of equal parts of S- and R-ibuprofen) or a mixture of different parts of S- and R-ibuprofen in the range between pure S- and ibuprofene as active substance. The slow-release ibuprofen composition constitutes a gelatine-based pharmaceutically applicable nanosol and satisfies the requirements of an efficient thereapy for rheumatism.