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 U41 K 401 POT 10 54 111 MP 441 NAT HP 228 25 H118 A027 L 4 PD 532 logo and 15 209 or 274 791 220 OMJ 150 AA 71 ZC 79 WW 174 COUMADIN 10 AN 441 VISTA 115 MX44 RP115 136 020 logo and 4804 HMP KU128 cor 216 H 94 WW 27 NXT GG 438 FL 2.5/500 U27 K 100 E227