BOSTON – The psychiatrist who prescribed medication used in the overdosing death of a 4-year-old girl agreed Wednesday, to stop practicing medicine until the case is resolved.

Michael Riley, 34, and his wife, Carolyn Riley, 32, are charged with first-degree murder for what prosecutors call an “intentional overdose” of their daughter Rebecca.

The husband and wife pleaded not guilty Tuesday, and their lawyers said the couple was only following doctor’s orders in the medications they gave their daughter.

Dr. Kayoko Kifuji’s voluntary agreement not to practice was accepted Wednesday by the state Board of Registration in Medicine. She can’t practice medicine again until approved by the board.

Kifuji’s attorney, J.W. Carney, told reporters that his client did nothing wrong and is cooperating with investigators.

“She absolutely did not over-prescribe and her medical records will back that up 100 percent,” Carney said. “The dosage was appropriate. The drug was appropriate and the monitoring was appropriate.”

Plymouth County District Attorney Timothy J. Cruz said Rebecca suffered congestive heart failure as a result of overdosing.

In December, police officers responded to the couple’s former home in Hull where they found Rebecca Riley dead on the floor in the master bedroom.

An autopsy found the cause of death as a lethal combination of several prescriptions drugs, including a fatal dose of Clonidine, which Rebecca Riley had been taking for attention deficit hyperactivity disorder, the district attorney’s office said.

The coroner’s report also found Valproic Acid, also known as Depakote; Dextromethorphan, a cough suppressant in over-the-counter medicines; and the antihistamine Chlorpheniramine in Rebecca Riley’s system.

She also had been prescribed medication to treat bipolar disorder, Cruz’s office said. The girl was diagnosed with attention deficit hyperactivity disorder and bipolar disorder when she was 2 years old.

Kifuji is certified in pediatrics and psychiatry, specializing in child and adolescent psychiatry, and has been licensed to practice in Massachusetts since 1999, the board said. She is a 1981 graduate of Tokyo Women’s Medical College.

Kifuji was put on paid leave from Tufts-New England Medical Center.

On Beacon Hill, the chairman of the Joint Committee on Public Health said Wednesday he’ll hold an oversight hearing to examine the practice of prescribing medication to children. Rep. Peter Koutoujian, D-Waltham, said he’ll seek legislative measures to better protect children.