Combinations - benzos BEFORE coke?

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swim does some coke on the weekends only if he's lucky enough to come across some good quality blow, if its shit swim just gives it away.
the thing is: no matter how good the coke is it always makes swim's heart go so fucking fast he gets scared and makes him sweat like a runner, not to mention the fucking insomnia.
swim once took 1 mg xanax (alprazolam) before the coke and found the coke high to be really mellow and enjoyable but after a few lines the coke wore off even after swim kept doing lines.
swim also experienced with benzos after coke and that works wonders.
but what swim is trying to figure out here is how much of a benzo like alprazolam or clonazepam (he has tons of those two) he would have to take BEFORE the coke to take the edge of the high and still be able to feel it right.