The invention provides a method of assessing the appropriate therapeutic
dose of 1-{4-[1-(4-cyclohexyl-3-
trifluoromethyl-benzyloxyimino)-ethyl]-2-ethyl-benzyl}-
azetidine-3-
carboxylic acid to administer to a patient in need thereof, comprising the steps of:(i) testing whether or not the patient has the poor metabolizer
genotype; and(ii) if the patient does not have the poor metaboliser
genotype, administering 1-{4-[1-(4-cyclohexyl-3-
trifluoromethyl-benzyloxyimino)-ethyl]-2-ethyl-benzyl}-
azetidine-3-
carboxylic acid, or a pharmaceutically acceptable salt thereof, to the patient at the standard therapeutic
dose; and(iii) if the patient does have the poor metaboliser
genotype, either(a) administering 1-{4-[1-(4-cyclohexyl-3-
trifluoromethyl-benzyloxyimino)-ethyl]-2-ethyl-benzyl}-
azetidine-3-
carboxylic acid, or a pharmaceutically acceptable salt thereof, to the patient at a therapeutic
dose below that of the standard therapeutic dose; or(b) not administering 1-{4-[1-(4-cyclohexyl-3-trifluoromethyl-benzyloxyimino)-ethyl]-2-ethyl-benzyl}-azetidine-3-carboxylic acid, or a pharmaceutically acceptable salt thereof, to the patient.