It might be 0.5 mg NOVO-CLONAZEPAM (clonazepam), described as:
N over N on scored side, 0.5 on unscored side
You can find an image of NOVO-CLONAZEPAM at
http://www.novopharm.com
I'm not a pharmacist or a medical doctor. This message is not medical advice nor is it an offer to provide medical advice. All drug identifications should be validated by a licensed MD or pharmacist.