AN 18-year-old girl from Oxfordshire died after taking an accidental overdose of migraine medication, a coroner ruled today.

Megan Biddle, a pupil at Lord Williams School, Thame, had no intention to take her own life, assistant coroner for Oxfordshire Nicholas Graham said.

It emerged that Megan, a passionate music fan and popular teenager, had stopped taking her beta-blocker medication last year after she stopped having migraines.

But Oxford Coroner's Court heard how she went into her brother Jack's bedroom on the morning of Sunday, March 1, and asked him to call an ambulance because she said she had taken some of the pills and was feeling unwell.

Her parents and brother, who attended this morning's hearing, said they still weren't sure exactly why she had taken the pills or how many, but they assumed she must have been experiencing migraine symptoms again.

She was taken to the John Radcliffe Hospital, Oxford, and her condition gradually improved throughout the day, regaining consciousness and speaking to her family in the afternoon.

However her condition worsened again in the evening, and she died in the early hours of Monday.

Her mother Alison Biddle said: "Megan was an energetic and lively teenager with everything to live for and her whole life ahead of her.

"She was a fun-loving, kind and thoughtful young lady."

Megan's death sparked a social media trend to keep her “wonderful, infectious” spirit alive.

Friends created the Twitter hashtag #thingsbiddid, using Megan’s nickname Bid, to tell the world about their “amazing” friend.

The Year 13 pupil lived in Thame with parents Iain and Alison and younger brother Jack.

Jack posted on Twitter: “An amazing, joking and caring sister, to the last minute and forever.”