Isotretinoindosage

Isotretinoin capsules should be administered with a meal (see PRECAUTIONS: Information for Patients ). The recommended dosage range for isotretinoin capsules are 0.5 to 1 mg/kg/day given in two divided doses with food for 15 to 20 weeks. In studies comparing 0.1, 0.5, and 1 mg/kg/day 8, it was found that all dosages provided initial clearing of disease, but there was a greater need for retreatment with the lower dosages. During treatment, the dose may be adjusted according to response of the disease and/or the appearance of clinical side effects – some of which may be dose related. Adult patients whose disease is very severe with scarring or is primarily manifested on the trunk may require dose adjustments up to 2 mg/kg/day, as tolerated. Failure to take isotretinoin capsules with food will significantly decrease absorption. Before upward dose adjustments are made, the patients should be questioned about their compliance with food instructions. The safety of once daily dosing with isotretinoin capsules have not been established. Once daily dosing is not recommended. If the total nodule count has been reduced by more than 70% prior to completing 15 to 20 weeks of treatment, the drug may be discontinued. After a period of 2 months or more off therapy, and if warranted by persistent or recurring severe nodular acne, a second course of therapy may be initiated. The optimal interval before retreatment has not been defined for patients who have not completed skeletal growth. Long-term use of isotretinoin capsules, even in low doses, has not been studied, and is not recommended. It is important that isotretinoin capsules be given at the recommended doses for no longer than the recommended duration. The effect of long-term use of isotretinoin capsules on bone loss is unknown (see WARNINGS: Skeletal: Bone Mineral Density, Hyperostosis, and Premature Epiphyseal closure ). Contraceptive measures must be followed for any subsequent course of therapy (see PRECAUTIONS ). Table 4 Isotretinoin Dosing by Body Weight (Based on Administration With Food) Body Weight Total mg/day kilograms pounds 0.5 mg/kg 1 mg/kg 2 mg/kg See DOSAGE AND ADMINISTRATION: the recommended dosage range is 0.5 to 1 mg/kg/day. 40 88 20 40 80 50 110 25 50 100 60 132 30 60 120 70 154 35 70 140 80 176 40 80 160 90 198 45 90 180 100 220 50 100 200 INFORMATION FOR PHARMACISTS Access the iPLEDGE REMS system via the internet ( www.ipledgeprogram.com ), or telephone (1-866-495-0654) to obtain an authorization and the "do not dispense to patient after" date. Isotretinoin capsules must only be dispensed in no more than a 30-day supply. REFILLS REQUIRE A NEW PRESCRIPTION AND A NEW AUTHORIZATION FROM THE iPLEDGE SYSTEM. An isotretinoin capsules Medication Guide must be given to the patient each time isotretinoin capsules are dispensed, as required by law. This isotretinoin capsules Medication Guide is an important part of the risk management program for the patient.