Dame Elizabeth Taylor is expected to stay in hospital for several days after her treatment for congestive heart failure.
The 78-year-old former actress was resting comfortably and had been receiving family and friends in her room throughout the weekend at Cedars-Sinai Medical Centre in Los Angeles, her spokeswoman said.
Dame Elizabeth was admitted late last week and was being treated for symptoms caused by the condition first diagnosed in 2004.
It is not clear exactly how long she would be in hospital but if her past treatments are any indication it could be for several more days.
"At this stage, with her history, they're going to want to keep her in for a while just to make sure they've fixed what they needed to fix," said the spokeswoman.
Dame Elizabeth, who appeared in more than 50 films, won Oscars for her performances in "Butterfield 8" (1960) and "Who's Afraid of Virginia Woolf?" (1966).
But she has been just as famous for her eight marriages - including two to Richard Burton - and her lifelong battles with substance abuse, weight and physical ailments, including numerous visits to the hospital for more than 20 major operations and countless treatments.
The actress had near-fatal bouts with pneumonia in 1961 and 1990, and another respiratory infection forced her to cancel all engagements for several weeks in late 1992. She had both hip joints replaced in 1994 and 1995.
Her 2004 diagnosis for congestive heart failure, compounded with spinal fractures and the effects of scoliosis, left her nearly bedridden.
She has also battled ulcers, amoebic dysentery, bursitis, and had a benign brain tumour removed in 1997. In recent years, she has had to use a wheelchair when out in public.