She died five days later, having been given diamorphine and sedatives on a continuous basis.
They include buprenorphine (Subutex), buprenorphine and naloxone (Suboxone), diamorphine (pharmaceutical heroin) or dihydrocodeine for drug treatment.
But Mrs Richards, of Lee-on-the-Solent, died four days after continuously being given diamorphine via a syringe driver.
The 91-year-old was sent there to recover from a hip operation but died after being given diamorphine.
She died five days later, having been given diamorphine on a continuous basis.
The coroner heard how the following day Mrs Richards was put on a syringe driver filled with diamorphine, treatment normally given during end-of-life care.
The most common mistakes involved painkillers like paracetamol, morphine and diamorphine.
At that point Dr Jane Barton, who was in charge of the ward, prescribed Mrs Richards diamorphine to be administered using a syringe driver, he said.
Their paramedics, and theirs alone, can give you a shot of a life-saving heart drug, frusemide, and also the best drug available for relieving your pain, diamorphine.
On the day Mrs Richards arrived at the hospital Dr Jane Barton wrote up a wide-ranging diamorphine prescription that allowed her to be given anything from 20mg up to 200mg.
Dr Ubani was working for an out-of-hours medical service in 2008 when he injected 70-year-old David Gray with 10 times the recommended dosage of diamorphine during a visit to his home in Manea.
Dr Stuart Gray, whose father David died in February 2008 after accidentally receiving 10 times the the maximum dose of diamorphine from Dr Daniel Ubani, told the programme that without a change to the current out-of-hours system, "there will be other cases".
The seven-day inquest heard that Dr Jane Barton, who was found guilty by the General Medical Council (GMC) of multiple instances of professional misconduct in 2010 but was not struck off, had prescribed levels of diamorphine for the nursing staff to administer in case Mrs Richards' condition deteriorated.
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