BNP Chairperson Khaleda Zia was served papaya juice and assorted fruits after she was taken to old central jail on Nazimuddin Road in Bakshi Bazar on Thursday.
As per UNB, the BNP chief was taken to the jail by a white SUV amid tight security measures.
According to a jail source, Khaleda's domestic help Fatema Begum is accompanying her inside the jail.
He said Ahsan Habib, a physician of the central jail, conducted a physical checkup of Khaleda and found her blood pressure and pulses normal.
Later, she was given papaya juice and some low-sugar fruits like apple, oranges and grapes.
The BNP chief has now been kept in a large room which was earlier used as the office of the jail super.
"The room has been made neat and clean and upgraded with all facilities like AC, cable TV connection, kitchen, healthy washroom and cozy bed, for a VIP prisoner," said a jail official wishing anonymity.
He said the BNP chief will be kept there for a few days, and she will either be moved to the old jail's female ward near the day-care centre, or to a rented house that will be declared a sub-jail by the Home Ministry.