The Entheogen Review contains a report of a Salvia-LSD trip which has
some parallels to my own experience with this combination. This journey
was induced by smoking a small amount of dried Salvia divinorum leaf,
which typically would yield only minimal effects when not potentiated by
LSD.
 

"Upon reading that a large initial intake is critical to the level of the
experience, I smoked Salvia divinorum in a bong. One inhalation led to
minimal effects when used alone. Desirous of the full spectrum, I tried
smoking it while in the midst of my usual 35~450 mcg. of LSD. I inhaled
deeply and then again. Sometime after the second inhalation I completely
lost awareness of anything. After several seconds (or minutes, I really
don't know) awareness returned, though only remotely. There was pain in my lungs and I began deep breathing. I started to panic and thought I'd
burned my lungs somehow. While still desperately puffing in and out, my
perception imploded. Our vision resolves images from each eye into one
image: in this case,  my  perception  became  impossibly skewed:  my
consciousness was imploding! Totally confused, I felt that I was being
electrocuted and I began spinning and moving around to tree myself from
the "current." My face felt like it was also imploding and at one point it
seemed like I could see its other side; my eyes were now facing each other! I was convinced that death was imminent. My girlfriend assured me that I appeared normal, which comforted me greatly. At this point I had no memory of having smoked the Salvia -- it took ten minutes before I remembered. I satin total confusion, still convinced that death was certain. Slowly, the familiar LSD awareness returned, though for a long time my central vision bulged as in Escher's "Balcony" and I felt that my mind had malfunctioned terribly. In retrospect, the phenomenon was much like a profound and relentless dizziness. I've smoked just Salvia twice since this experience and found that I need inhale only a minimal quantity (two small puffs) to stimulate a mild, short-acting recurrence of the phenomenon."