Can street cut cocaine 0.50g and medical 10mg diazepam make you very sleepy. as one is downer but surely the cocaine should give you up feeling. thank?

Just don't do it!!!!: There's really no need to take cocaine, whether street cut or not. You're just putting your health & life at tremendous risk for bad things to happen. Same goes for diazepam (Valium). Worse when you mix up drugs that tend to do different things. Your body has no idea which way to go. If you've already done this, go to your nearest A&E (emergency department) to get sorted out. Then check into detox