Cyclosporine dose reduction in stable renal transplant patients with high C2 level: simplified method of single C2 measurement and individualization of C0 target

It is recommended that cyclosporine dosing should be based on the whole blood level 2 h after a dose (Q), not the trough level (CO). Initial studies did not however establish the outcome of dosing according to C2 levels in long-term patients previously managed by CO levels. CO and C2 were measured in 152 stable patients receiving Neoral therapy, mean 86.9 months after transplantation. This showed that 38 (25%) had C2 levels above a target range of 700900 mu g/l. Higher C2 levels were associated with higher cholesterol levels (P 0.0058) and higher diastolic blood pressure (P = 0.0163). Cyclosporine dose reduction was undertaken in 32 patients with high C2 levels. For logistical reasons, C2 was not performed regularly, but an individualized CO level was set for each patient. A 16% reduction in mean cyclosporine dose was achieved, associated with a 28% fall in mean CO, from 212 to 153 mu g/l, and a 25% fall in mean C2, from 1075 to 820 mu g/l. There was no excess in adverse events in the dose reduction cohort, compared with patients with initial C2 levels < 900 mu g/l. Over a mean 15 month follow-up period in the dose reduction cohort, there was a 4.4% reduction in mean diastolic blood pressure, from 84.9 (SEM 2.1) to 80.2 (1.9) mmHg, P = 0.023; and a 10.4% reduction in mean cholesterol, from 5.71 (0.27) to 5.11 (0.25), P = 0.005 (patients starting on statin during follow-up excluded). In patients with initial C2 < 900 mu g/l, blood pressure did not fall and the cholesterol fell by 3.9%, from 5.27 (0.14) to 5.07 (0.15) mmol/l (P = 0.0405). In conclusion, cyclosporine dose reduction was safe in stable long-term renal allograft recipients with high C2 levels. There was an improvement cholesterol levels and a small improvement in blood pressure after cyclosporine dose reduction.