I find when taking a low dose of alprazolam about 500μgs or lorazepam 1mg I hardely get any of the negative side effects while tripping. This also depends on how your body and mind react to benzodiazepines. You can safely combine these benzos with LSD. Some people at that dose it can be too much and just put them to sleep but for me it hardly makes me tired. Just a little more relaxed and anxiety free. Also people that freak out and go to the hospital they usually give them lorazepam or diazepam at a higher dose IV and a big bill.
I'm not a DR, try at your own risk. Everyone knocks Benzos, yes they can be dangerous, but they are much safer than so many other meds out there. Never combine them with alcohol or narcotics. They are safe for most people when used at proper doses in moderation. Just don't be a junkie with the benzos and have a wonderful trip!