yup you may puke without preparation
may i ask where u got them? from your name i guess u got it from doctors in spain? for what reason? i only got midazolam injected once for op, that shit was insane. rohypnol/flunitrazepam is also very strong.
black out and pass out are two different things, for amnestic effects there are better benzos. for passing out/unconsciousness i would choose the strongest ones, like rohypnol/flunitrazepam, but im not sure if that sn combination will work out as planned, many different variables here with timing. also there may be some very potent research chemical benzo/thienodiazepine variants to use, but the ones i tested yet were not that hardcore (flunitrazolam/clonazolam/etizolam), rather just like normal benzos like xanax. xanax is mostly anxiolytic and less sedating/hypnotic. you may look for the sedating/more hypnotic ones like flunitrazepam for passing out