My first experience with 2C-D was at 10 mg (orally), and the effects were nothing to write home about. I was mostly scatterbrained and giddy for a few hours, unable to focus on anything in particular. Making music was a vain effort.
A few weeks later, I tried with 20 mg, then later that month with 30 mg, attending concerts on both occasions (going on foot!), as I felt the material would be light enough for those types of settings. While the latter experience was slightly more intense, the effects were more or less the same: roughly 90 minute onset, colors seemed more vivid, tactile sensations quite pleasant, a heightened sense of humor and maybe less inhibition, and a very small hint of paranoia. Depth perception also seemed slightly altered. Music seemed more pleasant to listen to, but I distinctly remember being able to stay critical about it. Some delay sounds clearly felt “plastic”, so there might some synesthesia there. Effects gone after 4 hours.
At 30 mg, I do remember feeling it slightly difficult to stand up straight and motionless. Nevertheless, in neither case did anyone who didn't know I had taken 2C-D notice anything unusual at all about me. One side effect I noted from both experiences was feeling from time to time a sharp headache in the back of my head, as well as the sensation of pressure on my skull. I would be interested to know how 2C-D affects blood pressure.
Later that summer, I decided it was time to take it to 45 mg. This time I decided to attend a small scale all-night party at a venue I am very familiar with, hosted by friends of mine. The effects of 2C-D didn't come on until 90 minutes, and were far more dramatic than anticipated. In addition to the familiar effects noted at 20-30 mg, I started noticing “dislocated” tracers: something I saw in my field of vision would momentarily reappear somewhere else, but not in a continuous fashion, like a disappointing kaleidoscope. Then I remember feeling a strong jolt of energy going through my head. It was unlike anything I'd ever felt, and frankly a bit worrying, although not entirely unpleasant. This only occurred once, still during the onset phase. The aforementioned headache did not occur this time, but there was pressure on my head.
After about 2 and a half hours following ingestion, I decided to step outside for some fresh air. I remember carrying my bag on one shoulder and being completely destabilized by this uneven weight on my back. Once I had it on both shoulders, everything was fine.
Once outside, I realized the true psychedelic effects of 2C-D had begun. The pavement was unmistakably undulating. Street lights seemed much more vivid than usual, giving a surreal pink tinge to everything. The materials from this familiar building all seemed alien and plastic. Viewed from outside, the red bricks made the building look like some giant cake. Windows looked like water surfaces.
Yet despite this extremely new set of sensations, I was able to hold conversations with seemingly unsuspecting acquaintances. Perhaps I was giggling more than usual, but I was able to contain myself surprisingly well. I did however feel waves of mental confusion coming and going. Concentrating on anything was hard, yet some alertness remained. It felt as if I was observing myself being under the influence of this chemical from behind a glass window. No insights whatsoever, though. Time got quite distorted at this point. One hour easily felt like two. Physically, it was slightly exhausting.
The music felt more detailed, or rather, I started noticing how psychedelic simple production tricks like delay could be, and decided that the notion of “psychedelic music” was a complete oxymoron. Unlike I would under the influence of alcohol or MDMA, I was completely unwilling to dance beyond nodding along. In fact, I find that 2C-D made me quite tense, even petrified. Empathy is not one of its virtues either. In fact, I find myself wisecracking and being more sarcastic than usual under its influence, and at times, it would take me a while to remember I was the only one having taken 2C-D, and that others might simply be drunk, or even sober. At this dose, I found it is not a party drug, and I can see why it is so uncommon.
As usual, the effects faded after 4 or 5 hours, and I felt fine the next day.
I have since experimented back at 25-35 mg, and find these doses much more pleasant in social settings. Headaches seem preventable by taking 2C-D after a good night's sleep. Drinking one beer a few hours before my last 25 mg experience, I felt none of the unpleasant side-effects I've noted above.