80 FMF patients will enroll: 20 taking 1 mg colchicine a day 20 taking 1.5 mg colchicine a day 20 taking 2 mg colchicine a day 20 taking 2.5 mg colchicine a day one blood sample for trough colchicine levels will be taken. response to treatment, colchicine side effects and anthropometric data will be collected.