Medicaments for the treatment of disorders of lipometabolism and their use

A method of combating lipometabolic illnesses in warm-blooded animals which comprises administering to the animals a hypolipidemically effective amount of a urea derivative of the formula ##STR367## in which R.sup.3 and R.sup.4 are identical or different and in each case represent a mono-or bi-cyclic carbocyclic aryl radical, optionally substituted by 1 or 2 identical or different substituents selected from cyano, halogen, alkyl, alkoxy and alkylmercapto, the alkyl, alkoxy and alkylmercapto radicals mentioned being in turn substituted by 1 or more fluorine atoms with the proviso that (a) R.sup.3 and R.sup.4 contain a total of 2 or 3 substituents including a total of 1 or 2 halogen substituents (b) R.sup.3 and R.sup.4 are devoid of ortho substituents and (c) R.sup.3 and R.sup.4 are so chosen that p,p'-substituted compounds and m,m'-disubstituted compounds in which the substituents are fluorinated alkyl groups are excluded, and X represents an oxygen or sulphur atom either alone or in admixture with an inert carrier or in the form of a medicament.