well I'va been throughdramamine (dimenhydrinate) wich is a "sedative anticholinergic anti-nausea"
suggested hallucinogenic dosage on erowid.org was 8 to15 pills
Me and a friend of mine tried 10 pills with very little results (exepting heavy sedation)...so I tried 20 pills, doubling dose isn't wise, I know, that's exactly how I learnt this rule because I almost died and still didn't get any effects exepting very heavy sedation, irregular heart beat (I thought my heart almowas going to stop, but Iwas lucky and didn't die). Oh, yess also, very fun because my blood wasn't circulating well: my extremities did turn blue (well, fingers were blue and....my balls turned brown

). I had to take a hot bath to produce vasodilatation so things came back to normal on the sixth hour.
My friend had different results as he would beok with this stuff, so he did getacute delirium from 25 pills (at least) and with 30 his heart almost stopped too.
Here's how washis trip: he would want to say something, but he would say something completely different without noticing it, and as I answer his unwanted question he would hear something completely different from what I said....let me give you a few exemples:
exemple one:
me (sober): were do you go for vacations?
him (on 25 pills): well, my grandmother said...
me: what the fuck are you telling lool ?
him: yes, don't you know how to make podridge, don't you?
exemple two:
him (answering to a question I didn't even asked): no, horses arn't here
me:

(feeling our discussion won't ever lead anywhere)
him: because the king is gone now you know hmfrr, why do you look at me this way, did I say something I shouldn't?
me:
exemple three:
him: it's late, I think I'm going back to my home now
me: you'reat your home now, no urge you know

...
and so on and so on....
he also spent great time to make cofee to an invisible woman he thought I was talking with..."she asked for cofee" he said when I asked if he was making coffee for him or for me...
he did speak to many invisible persons during the night (he wouldn't even believe me as I was telling him these people weren't real)...I remember him closing slowly a door for 15 minutes not to wake up 3 imaginary people sleeping in his bed...so fun but so strange as he didn't realize he was tripping and was so serious...yes, that's delirium.
the trip isn't euphoric at all, very very sedative, very dangerous for heart and blood circulation, and on the next day you don't remember much of how you spent your night...the only fun thing (if this is "fun") is the next day, when people tell you how psychotic like you've been acting, then you can think "well I was really fucked up"...to bad you didn't enjoy it as you were tripping and too bad you don'treally remember now.
I think the substance you want to try is very similar(sedativeanticholinergic pills right?... with a very similar name: dramamine/dimenhydrinate/diphenhydramine...looks like the same familly of compound if not the same)...my advice: don't (not fun and very dangerous)...much better drugs around.