I could feel the heroin a little bit this time because I did it so far into the trip, but it was subtle. I've done them together before (San Francisco Speedball) and I didn't feel the heroin at all then. The LSD was too strong. It lasted just about all night until I had to go to the methadone clinic at 7am. It was interesting because when I've shot LSD before the onset was immediate and cartoon land, out of this world intense. But this time it took about 10 minutes or so before I realized I was tripping balls. I put 2.5 tabs in distilled water inside the syringe and then soaked it for about 30 minutes. Then rinsed the tabs again and shot all the water. IV LSD is so much more potent, it was like the equivalent of a ten strip+ oral. It was so amazing. Maybe the the difference in onset was blotter vs. liquid, which is what I usually shoot. The only other time I did blotters, I soaked it in saline water and then the onset was just as fast. This is the slowest onset I've ever experienced. But well worth the 10 minute wait, lol!!!