The latest charges carry a total maximum sentence of just over four years in jail.
Former world heavyweight boxing champion Mike Tyson has pleaded guilty to drug possession and driving under the influence of drugs.
He was arrested in December 2006 in Arizona after being spotted driving erratically as he left a nightclub.
Tyson, 41, initially denied the charges at an earlier hearing in January.
Tyson served three years in prison after a conviction for rape in 1992 and was jailed again in 1999 for assaulting two people after a traffic accident.
The latest charges carry a total maximum sentence of just over four years in jail.
He was arrested in Scottsdale, Arizona on 29 December after nearly crashing his car into a police car as he left a nightclub.Prosecutors said Tyson had 2.16g of cocaine in his possession and traces of marijuana in his system when he was arrested.
At the time of his arrest, police reportedly said the former boxer admitted that he was addicted to cocaine.
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