LINCOLN — A Lincoln doctor has been arrested on drug charges and allegedly admitted to investigators that he is addicted to prescription painkillers.

Food and Drug Administration agents searched Dr. Jibran Khan’s office Friday and arrested him for possession of a controlled substance and possession of a habit-forming narcotic without a valid prescription.

Investigators said Kahn admitted that he was addicted to Fentanyl, a synthetic opiate. The police say that he got the drug by writing prescriptions for fake patients and pilfering medication from real ones.

Khan, an internist whose office is at 20 Cumberland Hill Rd., Woonsocket, has voluntarily surrendered his medical license, according to Dr. Robert S. Crausman, chief administrative officer of the state Board of Medical Licensure and Discipline. Crausman declined to answer questions about the case, saying that board investigations are confidential. If the medical board takes action, its order will be made public after its Aug. 13 meeting, he said.

— With reports from staff writer Felice J. Freyer