Lawyers for R Kelly say in new court documents that the convicted sex trafficker and singer was recently rushed to hospital after medically overdosing in prison.

The 58-year-old reportedly collapsed on Friday at the federal correctional institute in Butner, North Carolina, which specializes in housing sex offenders, and was transported to Duke University hospital.

In a new court filing on Monday reviewed by the Guardian, Kelly’s lawyers allege that he had been placed in solitary confinement on 10 June and was given medication by prison staff – along with “instructions to take it”.