Pill Identification by Imprints: GP400 Home Pill Identification by Imprints: GP400 5 results MAGNESIUM OXIDE 400 MG TABLET Side 1: GP400 Color: White Side 2: Shape: Round MAGNESIUM OXIDE 400 MG TABLET Side 1: GP400 Color: White Side 2: Shape: Round MAGNESIUM OXIDE 400 MG TABLET Side 1: GP400 Color: White Side 2: Shape: Round MAGNESIUM-OXIDE 400 MG TABLET Side 1: GP400 Color: White Side 2: Shape: Round MAGNESIUM-OXIDE 400 MG TABLET Side 1: GP400 Color: White Side 2: Shape: Round Other Popular Drug Imprint logo and 530 E 146 Z 3 4741 PLIVA 471 AZ 40 LC 77 GG 506 E502 E 221 OPI ML 64 BA 300 V-Z-F M 575 MYLAN 143 DAN 150 L193 A05 1207 logo and L001 MYLAN ZE 20 AS+ D LAMICTAL 200 TL601 10/325 N 11 logo and 76 Caltrate 499 HP 66 ANI 173 LCI 1332 T011 AP212 M 1860 CL 23 b 973 S 90 RX904