Only if you have a few days to spare... I had some BZP a little while ago and it screwed around with me for 3 days.
In the words of Simpsons comic book store owner : "WORST COMEDOWN EVVEEEERRR"
mixing stimulants and depressants is never "safe"...some may enjoy the effects of speedballing but they do so at a very high risk...it's very stressful on yer heart...
GC, grow a brain and stop giving bad advice. Benzos + anything never equals a speed ball and is not dangerous for the heart. If you go to a hospital after od'ing a stimulant they will give you a benzo to calm you down or control seizures.