Isotretinoin Absorption and Dietary Fat
Conventional oral isotretinoin should be taken with a high-fat, high-calorie meal to maximize and standardize gastrointestinal absorption. [1]
Amount of Fat to Consume
A standardized “fed-state” meal used in pharmacokinetic studies is a high-fat meal containing 50 g of fat (with ~800–1000 total calories). [1,2]
Practical Administration Guidance
Isotretinoin absorption is substantially lower under fasting conditions than under fed conditions, so taking isotretinoin without food is not recommended for maximal absorption. [3]
Key Quantified Food Effect
In fed versus fasting conditions, isotretinoin exposure is higher, with pharmacokinetic measures reported as approximately 50% higher AUC and 26% higher Cmax with a modified high-fat, high-calorie meal. [3]