Michael Madsen was hospitalized for flu-like symptoms following his DUI arrest in Malibu yesterday ... sources close to the actor tell TMZ.
As we reported, Madsen was pulled over for weaving through traffic on PCH -- and subsequently arrested after blowing a .20 on a breathalyzer test ... a test Michael claims was "flawed" and incorrect.
We're told the actor explained to police he had been suffering from the flu for the past several days ... and his condition may have had an impact on his driving ability.
Police transported Madsen to a nearby hospital where he was treated and released that same night.
We're told Madsen intends to plead "not guilty" to DUI charges.