Ambulance officers attended the woman at the scene before transporting her to hospital.
A 35-year-old woman was in cardiac arrest and taken to Royal Prince Alfred Hospital in a critical condition, a NSW Police spokesman told Daily Mail Australia.
A woman has been charged with using poison to endanger life after a female customer suffered a cardiac arrest when having a "medical procedure" at a Sydney beauty salon.
Paramedics rushed to the Medi Beauty Group in Chippendale at 3.30pm on Wednesday following reports of a medical episode. She remains in a critical condition on Thursday.
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That tweet offers little in the way of information, with Essential merely saying that it is aware of the situation and taking steps to mitigate it.
Detectives from Redfern Local Area Command attended the scene and conducted further inquiries.
Today, police charged a 33-year-old woman with reckless grievous bodily harm and using poison to endanger life.
The employee was released on bail, and is due to appear in Central Local Court on Thursday.
According to its website, The Medi Beauty is a "laser and contour clinic" and specialises in non-surgical facelifts, skin tightening, fat freezing and "anti-wrinkle injections".
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