Pill Identification by Imprints: C41 Home Pill Identification by Imprints: C41 3 results PRENATAL 19 TABLET Side 1: C41 Color: White Side 2: Shape: Oblong PRIMIDONE 50 MG TABLET Side 1: C41 Color: White Side 2: Shape: Square PRIMIDONE 50 MG TABLET Side 1: C41 Color: White Side 2: Shape: Square Other Popular Drug Imprint 1009 SL 100 CM L180 RI 61 MYLAN 3050 KU 261 UT 2.5 M 253 Watson 369 VSP1 N 20 logo and 4358 A-264 M 31 NoDoz 151 A D G ROBAXIN 750 RP 701 93 2264 WW929 C 92 APTALIS 25 PHARMACIA & UPJOHN AA69 MYLAN 5375 logo and 497 54 553 N 947 692 WPI 500 10 N A WPI 3508 5412 251 951 384 611