Dwyer was taken to the Portlaoise jail — the biggest detention facility in the State — at 8pm on Tuesday and given a single cell on the third landing of E wing.
Midlands Prison houses around 200 of the estimated 350 sex offenders in Irish prisons and a large number of the 300-plus inmates serving life for murder.
Dwyer was taken to E3 wing on Tuesday evening after being transferred from Mountjoy Prison, where he had been committed to after his sentencing on Monday afternoon.
Dwyer was seen by a prison governor on his arrival and given details of the regimes and expected behaviour. He was also assessed by the various services, including medical, education and work and training.
He is entitled to one visit per week. His only likely visitor is his father, who lives in Cork.
Dwyer shares a landing with a 30-year-old man, who, in March 2014, was sentenced to life for raping two girls, aged six and nine.
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E wing consists mainly, but not solely, of sex offenders and while Dwyer was not convicted of a sex offence, there was a sexual element to the murder of Elaine O’Hara.
Also in E wing, but on the first landing, is convicted murder Jerry McGrath, who was the subject of controversy in the Guerin report.
While on bail for another offence, McGrath murdered mum Sylvia Roche Kelly, age 33, in Limerick.
Murderer and rapist Gerald Barry is also in Midlands Prison, where he is serving two life sentences, one for the rape and murder of 17-year-old Swiss student Manuela Riedo and the other for the rape of a French student.
Other notorious sex offenders in the prison include Edward Piotrowski, who is serving five concurrent life sentences for the rape and sexual assault of a woman, and Christy Griffin, serving 15 years for raping a young girl.
Midlands is the biggest prison in the country and 795 inmates were in custody there yesterday.