Considering dipenhydramine systematically shuts down your brain section by section when taken at those doses, i would say nothing less than permanent debilitating brain damage. Just because you don't notice it doesn't mean its not there, it just means your brain is so fucked you don't realize it, although i wouldn't be surprised if you really thought about it hard if you noticed something really fucked up about the way you think now compared to the way you used to. Seriously, taking those doses of benadryl will do nothing more than show you what its like to be brain dead at certain levels of severity.
Damn...talk about a buzzkill....I'll have these little streaks that last a couple of weeks where I will be a 100 pack of the 25mg pink tablets, and if my last run was longer than a month ago ill start with 18 pills, and then next night 21, next night 24, next 27, next 30. I make 750mg my absolute limit...tolerance builds ridiculously absurdly fast with diphenhydramine...and its a long lasting tolerance... I have waited a year between runs and I took 13, but after an hour I realize I needed to use 18-20 tabs total so I pop 7 more. A bottle of 100 is like 4.99 at walmart. I don't think that would be considered sourcing because it's not an illegal substance. I also don't recommend anyone do the amounts I described, and/or the length of time I actively use it.
The main reason I do it you ask? I don't do it to trip, I do it when because it exponentially amps my libido and increases sensitivity...making for turbo orgasms. The refractory period is astonishingly shorter than the usual men my age experience...I am 28. Usually after you bust a nut, you throw on your clothes, smoke a ciggie, and watch re-runs of Dave Chappelle....with this...after my soldiers launch..I can cuddle, give her foreplay, and be back in battle literally within 4-6 minutes.
These streaks last like 2 weeks of doing between 500-750mg every night. Tonight is actually the end of my run, just ate the last 30 tabs.
However there is one thing that is very frustrating. If I am on the computer while on it, I will be in the middle of typing something and I will completely forget what point I was trying to make. I see something on one site which interests me in something else I want to google or youtube to look at...and by the time I open the browser and click on the URL to type it in or search...I end up forgetting what I was going to search for.
You get incredibly thirsty since it is an anti-histamine which dries up all your juices, which is why its good for stuffy/runny noses.
From now on I will wait atleast 2 months between runs, and I'll just buy 200 25mg tabs and once thats gone, than ill wait for at least those two months.
I can say though to reassure some people who do massive amounts like myself after building a tolerance, is that I so far have not experienced the short-term memory loss when I am not on it. Thankfully it hasn't affected my brain permanently. I can say that confidently because I really do experience those issues while on it, so I would be able to recognize if I have deja-vu with that problem.