I'm not speaking from experience or anything. Nor about the "dark" trip reports. I'm talking about the stories of addiction, permanent debilitating brain damage, and death.
It's pretty fucked that LSD, psilocybin, and THC are schedule I in the U.S. while this shit doesn't require a prescription.
(Not that I think DPH should require a prescription. More that psychedelics like LSD and psilocybin should be accessible recreationally.)
Here in Belgium, even ibuprofin needs a prescription. Certainly DPH.
Then again, here weed is still illegal (possession of 3g decriminalized) and the actually very beneficial stuff like LSD and psilocybin are also highly illegal.
You shouldn't be taking deleriants if you want to see some shit. Never done it myself but I've heard that the hallucinations are so vivid that you can be convinced they're real. Hard pass for me.
Take psychedelics instead. At least on those, you're aware that you're tripping.
Benadryl has been a brand in the US for decades longer than Cetirizine has even been in use, and they never changed the active ingredient when new antihistamines became available. Good thing too, cetirizine doesn't do shit for my allergies compared to DPH, and most other allergy med brands use cetirizine.