"Producers were concerned when she did not come out of her room and called paramedics as a precaution. Lindsay was examined and is fine, but did suffer some exhaustion and dehydration," her spokesman Steve Honig said in a statement.
"Lindsay was never taken to a hospital; reports to the contrary are false. She is resting now and is hoping to be back on set later this afternoon," Honig said.
A Los Angeles television station first reported that the 25-year-old actress, who has struggled with drug and alcohol addiction in the past, was found unconscious and rushed to a hospital.
The report raised alarm because Lohan has been in and out of trouble since a 2007 arrest for drug possession and driving under the influence of alcohol. Since then, speculation in Hollywood has been rampant that the star might join a long list of celebrities who have succumbed to addictions.
Lohan has been working on a TV movie, "Liz and Dick," about the storied romance of actors Elizabeth Taylor and Richard Burton.
In his statement, Honig said the actress had "worked a grueling schedule the past few days. She was on set last night at 7 p.m. and worked through the night until 8 a.m. this morning. She took a nap before shooting her final scene," Honig said.
