Pill Identification by Imprints: R31 Home Pill Identification by Imprints: R31 1 result MEFENAMIC ACID 250 MG CAPSULE Side 1: LU Color: Ivory Side 2: R31 Shape: Oblong Other Popular Drug Imprint 510 D10 P 2 M4 647 I 135 1201 EZEM K 16 GXL 2.5 1070 5/500 WC001 5683 BENTYL 20 B 4 R0.5 M 411 MYLAN 5420 JSP 544 8119 VRX 0901 FENTANYL 1600 MYLAN 156 LOTREL 2265 logo and 3061 A-011 30 MP 116 LZD Nitro-Dur 0.4 mg/hr L203 96 RC26 E 47 34 CP109 A 117 W104 299 OV 111 TL 115