Pill Identification by Imprints: P F Home Pill Identification by Imprints: P F 2 results THEOPHYLLINE ER 400 MG TABLET Side 1: U 400 Color: White Side 2: P F Shape: Round THEOPHYLLINE ER 600 MG TABLET Side 1: P F Color: White Side 2: U 600 Shape: Rectangular Other Popular Drug Imprint MYLAN 162 1044 M RE6 54 logo and 661 BN2 M B8 N 20 CALAN SU PE M123 PE820 E300 N 200 M3 or P or M4 IP 212 I 17 P3 C8 RG 1 8 ZC 80 44 113 GG 336 N 598 6469 RSN MP 573 L5 TN 4 logo and 11 STO 75 Nitroglycerin 0.6mg/hr par 086 R719 PREMPRO 0.45/1.5 MP 112 logo and 3091 1073 10/1000 2775