The phrase "administered himself" is correct and usable in written English.
It can be used in contexts where someone is taking control or managing a situation on their own, often in a medical or administrative sense.
Example: "After the accident, he administered himself the necessary first aid before help arrived."
Alternatives: "self-administered" or "managed on his own".
Today he has shifted his focus to Facebook pages and websites that he administers himself.
From the City of Brotherly Love, from the blue-collar racetrack of Philadelphia Park, here came Rocky the jockey, standing 5 feet 4 1/2 inches tall, weighing in at 110 to 112 pounds, smiling like the 39-year-old Derby rookie he is, when someone wondered if he felt like administering himself a good pinch.
In "Sudden Impact," Eastwood seems to have administered to himself a powerful, painful cure for self-righteous swagger.
Nixon's Southern California campaign treasurer Dana Smith suggested what became known as "the Fund", to be administered by himself, which would pay for Nixon's political expenses.
The farmer administered by himself the remaining partridges antibiotic therapy (enrofloxacin); over a three weeks' period all the remaining birds died.
They painted a grim picture: of Stanley exploding in temper tantrums, having a deserter hanged, working porters to death, ordering floggings left and right and administering some himself.
The Sungate investigation was sparked when some of Gerard Butler's horses tested positive and he was charged more than a month ago with several rule breaches, including administering injections himself rather than employing a vet to do so.
It was in that era that Williams started working for the Oklahoma City Police Department and administering them himself.
Burke had long been aware of the semi-underground use of ketamine as an emergency anesthetic he himself administered it at Ruby Ridge.
Mr. Wilson himself administered the oath to Mr. Thomas, but not before the entertainer, who died in 1991, was put through the rituals and oral presentations that remain a mystery to nonmembers.
