She may be best known for her role as the ultimate California Girl on the hit television series The O.C., but in recent months, actress Mischa Barton has found herself at the center of some unscripted drama in real life.

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In January 2017, entertainment news outlets reported on an incident in which a video surfaced of the performer in the backyard of her West Hollywood apartment yelling, crying, moaning, and falling off a patio wall after she’d spent an evening out drinking with friends.

“The next thing you know, I started acting strange, and my friends are like ‘this is completely out of your character. It’s time to go home’ – and a lot of the rest is blackout,” says Barton in an exclusive one-on-one interview with Dr. Phil airing Monday.

Barton, who was taken to a Los Angeles-area hospital by first responders after neighbors reportedly called 9-1-1, says she believes someone slipped her the so-called “date-rape” drug, GHB, without her knowledge. Stating that a paramedic told her she showed all the signs of having been given the sedative, the actress continues, “And I know I’ve never behaved like that from drinking or anything so – I am certain.”

Why does Barton say she had to move immediately after the incident at her apartment? Tune in to Monday’s Dr. Phil.