What would happen if you snort benadryl?

There really aren't any dangers of snorting it as long as the dosage is safe. The biggest problem is the burn, take my advise and don't snort it, burns worse than just about any drug on the planet. If you snort it you will instantly regret it, and the burn lasts upwards of 15 minutes That said, the safe dosage of benadryl (<100mg) is not going to get you high. And the dose that gets you high is most definitely not safe. I mean, you probably won't die from abusing the stuff, you'll just get delirious for a good 12 hours and end up in the ER because someone sees you acting like a moron. So the real point here is, don't try and use the stuff recreationally in the first place.