The deal on the misdemeanour charges also call for the 21-year-old actress to serve 10 days' community service and complete a drug treatment programme.
"It is clear to me that my life has become completely unmanageable because I am addicted to alcohol and drugs. Recently, I relapsed and did things for which I am ashamed. I broke the law, and today I took responsibility by pleading guilty to the charges in my case," E! Online quoted Lohan, as saying in a statement.
"No matter what I said when I was under the influence on the day I was arrested, I am not blaming anyone else for my conduct other than myself. I thank God I did not injure others. I easily could have," she added.
The 'Mean Girls star was placed on 36 months' probation, is required to complete an 18-month alcohol education programme, pay hundreds of dollars in fines and must complete a three-day county coroner programme in which she will visit a mortuary and talk to victims of drink drivers.
"I very much want to be healthy and gain control of my life and career and have asked for medical help in doing so. I am taking these steps to improve my life," she said.
"Luckily, I am not alone in my daily struggle and I know that people like me have succeeded. Maybe with time it will become easier. I hope so," she added.