Pill Identification by Imprints: P F Home Pill Identification by Imprints: P F 2 results THEOPHYLLINE ER 400 MG TABLET Side 1: U 400 Color: White Side 2: P F Shape: Round THEOPHYLLINE ER 600 MG TABLET Side 1: P F Color: White Side 2: U 600 Shape: Rectangular Other Popular Drug Imprint 210 2063 V ML 70 ZC 81 44 548 CTI 122 McNEIL COUMADIN 4 TV U7 M31 R718 1335 IDT M30 A538 H 2 logo and 120 393 1117 A5 or A6 AA1 B 526 TL516 44 218 8 06 RG 10 MP 50 A59 ZC44 54 323 TCR E 102 RC26 WFHC 36 01 NL2S EP 116 C C C 141 363 L129