Bendtner, 25, was cautioned after being spotted driving erratically in Copenhagen at the weekend, later apologising for what he called “a mild case of drink-driving”.
He was charged with driving under the influence and, with his general reputation as a playboy in mind, his national federation acted swiftly.
“The DBU has given Nicklas Bendtner six months to reflect on his international future,” the federation said in a statement.
“The DBU respects the right of all players to a private life, but equally there are certain rules of public behaviour that international players are expected to respect.”
Bendtner, who has scored 22 goals in 55 international appearances but has largely struggled for top level clubs, was seen driving on the wrong side of the road in the early hours of Sunday morning following a night out.
He has not played since December 17 due to a thigh injury.
Bendtner was a highly-rated youngster but he appears to have peaked, with no tangible progress since his late teens.
The 6'4" target man tends to make headlines for his colourful statements and high-profile love life, which has seen him date several celebrities and father a child with a member of the Danish royal family.
He was also fined £80,000 by UEFA for revealing the logo of sponsor Paddy Power while celebrating a goal during the European Championships last summer.
Bendtner scored eight times in 28 Premier League matches on loan for Sunderland last season but has failed to find the net in eight appearances for Serie A leaders Juventus.