Randomised, double-blind, placebo-controlled study evaluating the effects of miltefosine on skin lesions in patients with treatment resistant chronic urticaria. Treatment resistance is defined by insufficient treatment response after a minimum of 1 week therapy with the maximum labelled dose of a non-sedating antihistamine. Eligible subjects will be enrolled at baseline 8 (+/- 1) days after screening. 75 Patients will be randomised in a 2:1 ratio to one of the following treatment groups as add-on to the ongoing therapy with a non-sedating antihistamine for treatment period of 4 weeks: 25 placebo and 50 active drug Efficacy and safety evaluations are done at baseline day 7, 14, 21 safety, only) and 28 (or end of treatment) and at day 56 (28 days after end of treatment).