It is such a mysterious drug for our generation - barbiturates. I guess we are attracted to things that are either extinct or hard to procure. I wouldn't recommend taking large quantities of either. With that being said, I think pheno alone sucks completely. I feel depressed and just zombified [but in a bad way not like xanax or any benzo] for a few days. I noticed that mixing phenobarbital with some valium and tramadol gives me a nice relaxed feeling akin to valium and tramadol, but more drowsy and relaxed. Be careful though since you are taking heroin too. This combo might be dangerous in small amounts because of synergy and the pheno lasts 58 hours at minimum.