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 283 Lilly E 47 H 103 2 58 Nitroglycerin 0.4 mg/hr A112 ZA-09 MCR 313 rfx N 225 36 P 40 2080 BMS 140 logo and 7 5410 L17 TV 598 A 25 M377 04 M 447 266 544 44 531 WATSON 801 U85 851 M RE6 G220 MYLAN AC I 13 230 CN 500 93 308 e5 110 M451 TAK ALG-12.5 105 105 G443