Samantha Womack added vodka to her water to "keep things fresh" on stage during "The Girl On The Train".
The 46-year-old actress - who is most famous for playing Ronnie Mitchell in "EastEnders" until leaving the long-running soap in 2017 - has opened up about her role as alcoholic anti-hero Rachel, who believes she witnesses a crime from the window of her train, and admitted she likes to "try all sorts" of techniques to keep the production enjoyable rather than "boring".
However, Samantha's decision to drink on stage wasn't her best idea.
She said: "I try all sorts of things, when you're doing a long play, we've extended this tour twice we're in West End until Saturday and then were on the road til November.
"There was one time I put vodka in the water but I felt slightly unhinged. Unless it's to do things I enjoy, to keeps things fresh so it's not boring..." "
The "Kingsman: The Secret Service" star only has a 10-minute break in the production but doesn't find it too taxing.
Appearing on ITV's "Lorraine" on Friday (16.08.19), Samantha added: "There's just a pee break halfway through because I'm necking vodka, not actually vodka its water, yeah, like a 10-minute break and just back on. The momentum and energy keeps you going."
Samantha - who has Benjamin, 18 and Lily, 14, with her husband Mark Womack - is often joined by her daughter backstage, and the star revealed she provides a "grounding" influence
She continued: "I've got Lily, I home school she's 14 and she's in the dressing room most of the time.
"You know the truth if it is in the midst of the stage she'll be saying do you want this vegan salad and I'm in the middle of the play. it's very grounding, very helpful."