The 58-year-old Independence Township man told first responders he thought he was having a stroke.
He thought maybe his daughter had drugged him.
The 17 year-old girl made the brownies with marijuana she says she got from a friend.
She told police she left them out on the kitchen counter -- not thinking anyone would eat them.
The man was released from the hospital and is expected to be okay.
The girl is a Clarkston High School student and will likely face criminal charges.
Undersheriff Mike McCabe of the Oakland County Sheriff's Office said that marijuana is more potent these days than years ago.
"Marijuana today is not your marijuana of the 1960s or 70s," he said. "The THC level is multiple times more potent. Depending how much marijuana was baked into those brownies, it could lead to someone being violently ill.
"It could also lead to death."