Pill Identification by Imprints: GH 4 Home Pill Identification by Imprints: GH 4 1 result GUANFACINE HCL ER 4 MG TABLET Side 1: M Color: Green Side 2: GH 4 Shape: Round Other Popular Drug Imprint WW 951 D 25 M111 GG 97 SB 4141 K 78 MRK RX 901 P20 PROVERA 2.5 LCI 1356 EFF logo and 342 APP 332 PD 223 MYLAN 5200 2 56 H 94 Watson 371 logo and 530 MYLAN DE 5 U 128 RTG-400 320 CM4 MP 447 Fentanyl 25 mcg/hr A533 V251 93/7441 P 75 M 412 RB97 NL 771 R471 IP 254 056 ML 042 1 58 75