Investigation and inquest
On Twenty-Second June 2018 I commenced an Investigation into the death of Graham Martin SAFFERY aged 48. The investigation concluded at the end of the inquest on Twelfth September 2019. The conclusion of the inquest was Narrative Conclusion:
The Deceased died as a result of taking a combination of Oxycodone and Amitriptyline prescribed to him by health professionals. The combination of the drugs is known to carry a risk of sudden death. Despite exhibiting signs of over-sedation particularly following a doubling of his Amitriptyline dose on 23 May 2018 his prescription remained unaltered.
Ia Respiratory Depression Caused By Oxycodone and Amitriptyline Overdose
Circumstances of the death
Following a road traffic accident in November 2015, the Deceased was prescribed Oxycodone from October 2016. He was also diagnosed with depression in January 2018 for which he was prescribed Amitriptyline 10 mg. On 16 April 2018, his depression was classified as severe and he was also diagnosed with PTSD and his Amitriptyline was increased to 75 mg daily. Although his pharmacist reported him looking drugged and confused on 26 April 2018, on 23 May 2018, his amitriptyline dose was increased to 150 mg daily. On 27 May 2018, he was admitted to Bedford Hospital with reduced GCS. He was treated in ITU but was not referred to the Psychiatric Liaison Team and his prescribed medications were re-started on the morning of 29 May 2018. On 13 June 2018, his Pharmacist again expressed concern about his presentation as did his family but his medication remained unchanged. He was found deceased at his home on the afternoon of 19 June 2018. Post-mortem examination revealed a blood concentration of oxycodone 0.25 mg/L and amitriptyline 1.4 mg/L (nortriptyline 1.7 mg/L).
Coroner’s concerns
Although other pharmacological guidance such as Medscape Drug Interaction Checker and Stockley’s Interaction Checker recommend the need for both caution and monitoring when prescribing amitriptyline and oxycodone simultaneously, such advice does not appear to be provided by the BNF which is regularly consulted and relied upon by GPs.