The seven doctors, who were under investigation over King of Pop Michael Jackson's death last year, will not be charged.
However, Jackson's personal doctor Conrad Murray, who denies involuntary manslaughter, was not among the seven doctors questioned by investigators. He is accused of giving Jackson a lethal overdose of anaesthetic.
Los Angeles police had asked Californian state investigators to look into the way the doctors had prescribed drugs. Lawyer Brian Oxman, who is representing Jackson's father Joe in a wrongful death civil case, said he was "very disappointed".
"The misuse of medications by Michael Jackson in the last years of his life was excessive and to fail to bring that to the public eye is ignoring reality," bbc.co.uk quoted him as saying.