A Medical Council inquiry has resumed into allegations that a consultant medical oncologist at the Beacon Hospital in Dublin, prescribed an excessive dose of chemotherapy to a woman who received it for 16 days.

The patient, Sinéad Ní Dhúlaing-Johnson, had been a producer in RTÉ and died in November 2010.

The inquiry has asked that the consultant only be identified as 'Dr A'.

Her husband, Eddie Johnson, told the inquiry that they married in 2003.

He said that around November 2000, Ms Ní Dhúlaing-Johnson had a seizure after working on a live broadcast for RTÉ. Mr Johnson said it was a grand mal seizure.

Ms Ní Dhúlaing-Johnson was taken by ambulance to the nearby St Vincent's Hospital where a scan showed a shadow on the left side of her brain and it was recommended she be transferred to the neurosurgery centre at Beaumont Hospital, where doctors diagnosed an inoperable brain tumour.

Mr Johnson said his wife was put on anti-seizure medication.

The couple later went to the Memorial Sloan Kettering Cancer Hospital in New York, in August 2003, where doctors removed around 98% of the tumour.

They returned to Ireland where Ms Ní Dhúlaing-Johnson came under the care of St Vincent's Hospital oncologist Professor John Crown for chemotherapy which ended in 2004.

Mr Johnson said that in 2005 his wife returned to work as a TV producer in young people's programmes.

In June 2008, a scan indicated a tumour recurrence and it was recommended she go to the Beacon Hospital, which was the only hospital in Ireland for a particular type of specialist radiation treatment.

Mr Johnson said he and his wife met 'Dr A' at the Beacon on 13 August 2008.

He said 'Dr A' prescribed chemotherapy drug Temozolomide at 350 milligrams per day to be taken at home in the evenings.

The prescription was faxed to a chemist and the tablets were collected at the couple's local pharmacy in the Dundrum Shopping Centre in Dublin.

Mr Johnson said along with the tablet, his wife was also having radiation treatment at the Beacon.

He told the inquiry that on about the third day on chemotherapy, his wife was experiencing adverse symptoms, especially in her mouth.

Mr Johnson said it was "untrue" that 'Dr A' notified the couple on 5 September of the error in prescribing the higher dose during a consultation at the hospital.

By that time, his wife had taken 16 consecutive days of the chemotherapy drug.