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 Caltrate MP 577 CM3 WAR 5 617 logo and 2416 HP65 1 RP 2104 V 138 ucb 500 877 Z49 B 576 R 200 SD 9 NT 300 SPI RENAGEL 400 BP 633 RU10 93 3147 20mg L 178 207 VP 022 CLARITIN D 40 mg 44-518 894 barr 8 mg 5411 A 214 D20 VGC T 21 516 GG 259 APTALIS 3 54 425