Okay, I'm done, this post cannot be real, you cannot be real. There's just no way.

All medicines are drugs. Drugs are substances that change how our bodies work, potentially including our minds. Some are pretty safe and legal, some are extremely dangerous and illegal. But pretty much any drug can be harmful or even lethal in large enough doses. There's plenty of completely legal medicinal drugs you can buy over the counter and keep in a medicine cabinet that could kill you or cause permanent damage in the kind of amounts of Benadryl you seem to have taken.

Consider yourself lucky that you seem to have come out of this incident fine, and in future please read the label, good god, or you'll be explaining at the pearly gates that your headache was too bad to check the instructions.

A dose of benadryl appears to be a teaspoon or so, however much you were pouring, it must have been massively over that to make a noticeable difference to how full the bottle was.

Considering that Benadryl bottles all say either "BENADRYL: ALLERGY" or "BENADRYL: COUGH FORMULA" or similar on them, seeing that and thinking "yeah, this'll fix my headache" is quite the fuckup.

And I have to ask: What were you considering a "dose"? What exactly were you overpouring into?

Do you know what "drug" means?

As a perfect extra factoid from checking the Wikipedia page, I love that one of the scenes cut for the change was "A cameo by director James Mangold where he plays a director whose film is being changed to meet the demands of a test screening."