The trick with mixing stimulating and sedating drugs, whichever they may be, is to take the more sedating one first, and let the second bring you up. This way you can experience better the high provided by the stimulating drug, while still calm from the sedating one. Benzos don't ruin the effects of amphetamines, but if taken a bit after the effect of the amphetamines has taken hold, it might bring you down more than you would have wanted.
I completely agree with Alex000, as I like to go "Up" ... "Down" and "Sideways" 8)
I enjoy the benzo'ed drunk, loved-up, slurrrred speeaacchh, warm fuzzy-wuzzy floaty feeling...then BAM!
Zero-to-a-hundred miles in 5 seconds flat! (Just like a smack in the face with a cold wet fish).
My Manic Depressive/Bipolar cocktail binge fest::
1.) I usually eat seven 10mg Temazepam tabs (or Valiums) washed down with a bottle of 10%-12% cheap sparkling wine (to potentiate the benzo's) not RTD's (Ready To Drink) cans cause they usually have allot of caffeine in them (and I'm after the night and day extremes like 'Wow to Go', not 'Go to Wow')
2.) Then an hour and a half latter ten or eleven 10mg Ritalin tabs IV...WAMO!
It's feels like I just came out of a coma but being shot out of a cannon skyward.
Kind of like getting out of a hot tub into a freezing cold shower, only 100x better

Then spend the evening talking shit while totally wired with my mates till the early hours while taking turns at choosing music.
Then I repeat steps 1 and 2 again two hours latter.
*For all those "don't shoot pills" people, I filter first with cotton and then micro filter with .2 micro filters.
There are better drugs around like OC's, Meth, Shrooms, Ecstasy etc when I can get them, but above are my 'bread and butter pharms' which I have a script for, and I like the reliability of standardised pharmaceutical drugs, as a mate brought some Crystal Meth last week that was really an RC as she was tripping instead of tweaking?
Note: Do not try this at home folks unless you have life insurance, as it is very dangerous.
Peace out and be safe BL'rs