She was taken to the John Radcliffe Hospital by her mother after complaining of feeling unwell but Dr Aquib Hafeez, who treated her, could not find details of the substance she had taken on the hospital database and sent her home 75 minutes later.
Around two hours later, she suffered a seizure at home and was rushed back to the hospital but subsequently died.
Tests showed that she had died on December 11, 2011 of caffeine and multiple drug toxicity. She had 206mgs of caffeine per litre of blood in her system, the equivalent to 40 cups of coffee.
Dr Hafeez told the inquest that she had been "hyperactive" when she first arrived but had calmed down and that her family asked if they could take her home.
He could not find the drug on Toxbase, a toxicology database used by hospitals, and so agreed to discharge her.
"I have not come across caffeine overdoses as part of my clinical practice to this harmful effect," he said.
"The thing I could have done differently would have been to ring Toxbase. Hindsight is a very good thing."
Dr Rick Pullinger, who treated Miss Tripp during her second visit to the hospital, said that supportive treatment may not have saved her life.
"There is no antidote," he said.
"In retrospect, the supportive treatment wouldn't have changed the outcome. It's unlikely, but I can't say for certain."
The inquest heard that Miss Tripp's boyfriend had purchased the diet pills online.
The product was taken off the market two months later, last February.
Coroner Darren Salter said: "I will be writing to the Oxford University Hospitals NHS Trust to highlight the importance of having set protocol when certain drugs are not listed on a hospital's database."
He said he would also write to the Medicines and Healthcare products Regulatory Agency to make them aware of the case.
Recording a narrative verdict, he added: "I do not intend to apportion blame.
"There was no evidence Danni Tripp had taken any illegal substances and she had no underling health problems.
"It is quite alarming considering how death is so rare from caffeine toxicity.
"My condolences go to the family. I extend my deepest sympathies for their loss. This was an exceptionally sad turn of events.
"If this at the very least highlights the danger of pills (taken in this quantity) then it is one small positive note in the future."
Teresa Crowley, Miss Tripp's mother, said: "Danni was a lovely girl, full of life, very caring, who was very much the party girl.
"I don't believe she knew what effect the pills would have had when she took them. There's no way she would have done that knowing the risks.
"The inquest has been very thorough, but it won't bring her back will it?"
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