Miscibility of fenretinide with Eudragit® RL PO. Effect of drug loading and co-incorporation of 20 wt% solubilizers on the miscibility of fenretinide with Eudragit® RL PO polymer. X-ray diffraction patterns of fenretinide (a), blank Eudragit® RL PO film (b), 5 (c) and 10 (d) wt% fenretinide, and 20 wt% Tween® 20 (e), sodium deoxycholate (f), Brij® 98 (g), and Tween® 80 (h) loaded Eudragit® RL PO films. Fenretinide loading in solubilizer-loaded Eudragit® RL PO films was 5 wt%.