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 M 32 logo and TF T0101 M 617 874 4 M 52 GM 2 Watson 372 EZEM T 150 212 or 279 T591 XP 150 501 DAN 5535 VP052 D C KC 10 APO 116 GX CT1 MYLAN 148 M GP2 93 5200 Ortho or Ortho 135 CL17 C56 ALTO G 3718 B 260 MP 443 RP 700 N120 Z315 15 mg V358 P 985 54 346 S405 750 CL28 PLIVA 434