The Department of Corrections has been found not to provide an adequate assessment of a prisoner's condition, medication and ongoing care requirements.
The man, aged in his 50s, required daily medication for coronary vascular disease and twice-daily medication for HIV.
However, a report released by Deputy Health and Disability Commissioner Kevin Allan found Corrections in breach of the Code of Health and Disability Services Consumers' Rights.
During the man's incarceration, Corrections staff failed to administer his medication on a number of different occasions, and missed doses of HIV medication could have significant long-term implications for a patient.
"A number of staff at Corrections failed to administer prescribed medications, and placed this man's health at risk," Allan said.