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 SZ 198 PD 527 54 628 CMC 176 A 04 100mg ML 35 MYLAN 347 NL 710 232 or 294 or 233 NL 771 M C 524 logo and 3090 595 SZ 136 671 H 009 PY 1 MP 47 RD 54 37 44 44 588 WATSON 3209 51 TL 172 GG 201 L132 MYLAN 6090 K 13 RENAGEL 400 54 533 CL 43 K 9 2 VALIUM E 56 12.5 5683 K 40 I6