What is the dosage of cyclosporine for a 12-month-old patient?

Cyclosporine Dosing for a 12-Month-Old Child

For a 12-month-old child with nephrotic syndrome, the recommended starting dose of cyclosporine is 4-5 mg/kg/day divided into two doses, with target trough levels of 60-150 ng/ml. 1

Initial Dosing Recommendations

• For children with nephrotic syndrome, cyclosporine should be started at 4-5 mg/kg/day divided into two equal doses (morning and evening) 1
• The dose should be given on an empty stomach or before meals for optimal absorption 2
• For steroid-dependent nephrotic syndrome, cyclosporine should be commenced after achieving complete remission of proteinuria with prednisone 3
• In steroid-resistant cases, cyclosporine may be considered with concomitant prednisone for at least 6 months 3

Monitoring and Dose Adjustments

• Monitor cyclosporine trough levels during therapy to limit toxicity, with target 12-hour trough levels of 60-150 ng/ml 1
• Check serum creatinine and blood pressure at fortnightly intervals for the first 2 months, then monthly thereafter 2
• Monitor complete blood count, liver function tests, electrolytes, and lipid profile regularly 2
• If serum creatinine increases >30% above baseline, reduce the dose by 25-50% 4
• If no response occurs after 6 months of treatment (minimum 50% reduction in baseline proteinuria), consider alternative treatments 3

Duration of Treatment

• Cyclosporine should be continued for at least 12 months as most children will relapse upon discontinuation 1
• Following complete remission, cyclosporine should be slowly tapered (by 0.5 mg/kg/month) to the minimum effective dose 3
• Maintenance therapy may be required for 1-2 years 3

Potential Side Effects and Management

• Common side effects include hypertension (monitor blood pressure regularly), gum hypertrophy, hirsutism, and hypertrichosis 3
• Nephrotoxicity can occur, especially with prolonged treatment (>2 years) 3
• Consider repeat renal biopsies in children receiving long-term (>2 years) cyclosporine therapy 3
• Most side effects are reversible upon dose reduction or drug discontinuation 3, 5

Special Considerations for Infants

• Younger children (≤9 years) not on voriconazole may require higher initial doses of cyclosporine to reach therapeutic levels 6
• Careful monitoring is particularly important in infants due to their developing renal function 3
• The microemulsion formulation of cyclosporine is preferred for more consistent absorption 7

Treatment Algorithm

1. Confirm diagnosis of nephrotic syndrome requiring cyclosporine therapy 3, 1
2. Start at 4-5 mg/kg/day divided into two doses 1
3. Monitor trough levels (target: 60-150 ng/ml), serum creatinine, and blood pressure regularly 1
4. Continue for at least 12 months if responding 1
5. Taper slowly after complete remission to minimum effective dose 3
6. Consider discontinuation after 1-2 years of stable remission 3

Remember that rapid deterioration of renal function may occur even after years of continuous treatment when cyclosporine is stopped, so careful monitoring during tapering is essential 3.