Pill Identification by Imprints: M 64 Home Pill Identification by Imprints: M 64 1 result ATENOLOL-CHLORTHALIDONE 100-25 Side 1: M 64 Color: White Side 2: Shape: Round Other Popular Drug Imprint M 18 AMOXIL 500 US ProV S 180 CL 042 590 AR 50 MP 46 516 M 617 N 77 TL388 L431 V265 SP 22 ML52 720 SCHWARZ WW 458 437 MYLAN 8021 logo and 3116 ZF 25 WW 66 US 20 logo 2666 Nitro-Dur 0.2 mg/hr P-O VP 044 G456 L554 114 791 54 331 logo and 4359 TCL341 K 23 ML 57 I85 WATSON 932