The Mean Girls star was denied bail and taken into custody immediately after a hearing in Los Angeles Superior Court.
It will be Lohan's third stint in jail for a three-year-old drink and drug driving case, which was filed after a pair of high-profile arrests in 2007.
The star, who was accompanied to court by her parents, is due back in front of the judge on 22 October.
Her previous two stays at a women's jail in a Los Angeles suburb lasted 84 minutes and 14 days respectively.
She was released early on both occasions due to over-crowding.
The actress previously ackowledged she had failed her drug test, by posting messages on the micro blogging site Twitter.
"Substance abuse is a disease, which unfortunately doesn't go away over night," she said.
"I am working hard to overcome it and am taking positive steps. This is certainly a setback for me but I am taking responsibility for my actions and I'm prepared to face the consequences."
Lohan remains on probation for reckless driving and two charges of driving under the influence.
Fox dropped two other drug cases at a hearing in August, during which he announced Lohan's release from rehab and set out a strict outpatient treatment schedule that included random drug screenings.
At the time, he said he would sentence the actress to a month in jail for each drug test she skipped or failed.
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