Occasionally? define that? Occasionally as in run for a few weeks and stop, on and off etc.. No problem, i wouldnt call it a preworkout, but thats ok occasionally like that!
Now if you mean, monday youll take anadrol, then maybe friday youll pop another, anything like that will fuck you up.
Occasional as in steady run when you do, sure!
Occasional as in maybe just a couple to few days a week for a pick me up, NO!!