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 C 10 l81 517 Surfak G 300 mg 140 N20 GX CG7 5412 SP AZ 40 2 or 4 NL 571 T 19 Lilly TO 60 logo and 345 logo and NK 175 54 710 C 271 ZOVIRAX 800 135 MYLAN TM 140 ROBAXIN 500 T29 W 923 W 29 AAT 052 RIFADIN 300 516 S21 RI 62 n30 ESL200 NL 711 logo and 510 354 44 548 GG 614