Law enforcement sources say that Mueller, 35, was taken from her home in Tarzana to a hospital at 11:42 a.m.
Mueller, who has 3-year-old twin boys with Sheen, has long struggled with addiction and has been to rehab more than 15 times. Sources say she has been abusing drugs for the past several weeks.
She is currently conscious and responsive. No word yet on which drug she was using when she overdosed.
Update: Mueller’s rep, Steve Honig, says it wasn’t a drug overdose, telling TMZ, “An assistant thought Brooke was non-responsive while she was napping and hastily called an ambulance. As a precaution, Brooke was brought to a local hospital and discharged after an hour. She was diagnosed with exhaustion and dehydration and is now fine and resting at home. That’s it.”