Even for "some innocent stuff like Tylenol", as the original comment puts it, you do not want to be taking 5x the dose. This is a very harmful drug in (not very) large quantities.

I know of somebody whose boyfriend ended things with her, she took a load of tylenol to end her life, but the doctors managed to resuscitate her. When she came to, she said to her mother "I'm so glad I didn't kill myself over that bastard". A week later she died from liver failure.