Kamran Asa, the brother of Kianoush Asa, one of the victims of the 2009 post-election protests in Iran, was released on bail on 5 February, after five days in custody.
The civilian was denied access to his essential medicines in the detention centre of the Ministry of Intelligence in Kermanshah, in western Iran, Kurdistan Human Rights Network (KHRN) has learned.
After his release, he was immediately transferred to the hospital and hospitalised for several hours.
The intelligence ministry arrested Asa at his workplace in Golestan Mall in Kermanshah, on 31 January.
The security agents confiscated his mobile phone and the phones of his wife and the other employees.
Since the killing of Kianoush Asa in 2009, his brother and other family members have been detained and interrogated by security forces several times.
Kianoosh Asa was a civil rights activist and a student at the Tehran University of Science and Technology.
He was shot and killed by the paramilitary Basij forces of the Islamic Revolutionary Guard Corps (IRGC) on 15 June 2009, during the protests that broke out over the outcome of the presidential elections.