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 W 785 CIS 28 ucb 500 BUMEX 2 2174 ER 4 GG 258 S 180 riba 200 462 K 40 I-2 BRISTOL 3030 L122 MS 276 813 1004 4211 V 89 755/93 TF TF ZD 21 W 718 K 102 54 793 1200 P10 41 logo and 59 N 35 35 KX52 B 312 M 255 31 81 135 EP or E W 1037 logo and 4357 TYLENOL PM