Pill Identification by Imprints: AN 321 Home Pill Identification by Imprints: AN 321 4 results NIACIN ER 500 MG TABLET Side 1: AN 321 Color: Orange Side 2: Shape: Round NIACIN ER 500 MG TABLET Side 1: AN 321 Color: Orange Side 2: Shape: Round NIACIN ER 500 MG TABLET Side 1: AN 321 Color: Orange Side 2: Shape: Round NIACIN ER 500 MG TABLET Side 1: AN 321 Color: Orange Side 2: Shape: Round Other Popular Drug Imprint GG 181 scu1 CB7 A2 25 IP 464 H108 logo and 38 BM 105 cor 212 U-S 40 L321 046 GGD6 LAN 1231 D15 1/2 7153 barr VIP103 743 N 598 E72 691 FLINT ER E 134 WATSON 780 V 3 7U0 456 U39 A3 or F1 MYLAN ZE 20 EL 15 G433 AP211 V240 A-008 10 I111 555