Pill Identification by Imprints: U 400 Home Pill Identification by Imprints: U 400 1 result THEOPHYLLINE ER 400 MG TABLET Side 1: U 400 Color: White Side 2: P F Shape: Round Other Popular Drug Imprint K 13 RX616 1161 CP 331 GP325 L201 P 300 M 60 SMV MYLAN DA 5 48 11 CM TREXIMET MYLAN MT 21 Advil A/S L484 C152 B198 STO 200 CAR/RX AB1 44-503 A1 11 93 834 L 232 13 30 A 102 par 022 6469 PD 525 G 036 NCH 0820 PX 1 SB 4140 LI 5 CL 75 logo and H9 54 306 FLI 14 mg