A man has died after taking ketamine at Glastonbury Festival.

The music fan was taken into hospital after taking the drug and police said he was in a critical condition on Thursday evening.

A spokesman said: "Unfortunately the man taken ill after a suspected reaction to ketamine has died this morning. His family are aware and being supported."

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The 26-year-old man, from Reading, has not been named.

Police have warned festival-goers not to take illegal drugs. An officer tweeted: “Please don't take drugs at Glasto.

“Ketamine and alcohol dangerously affect your heart and breathing. It can be deadly and you don't know what or how strong it is.”

Officers said they did not believe a bad batch of the drug was responsible and that the man had an "individual reaction".

Ketamine is a class B drug that is legally used in medicine and by vets as a tranquiliser.

It is used recreationally for feelings of euphoria but can cause paralysis, panic attacks, memory loss, bladder problems and bad reactions can kill.

It was upgraded from class C in February in the face of mounting evidence over its physical and psychological dangers.

Ministers were told that users as young as 20 had to have their bladders removed due to heavy consumption.

Figures from the Home Office estimate that 120,000 people between 16 and 59 in England and Wales took ketamine last year.

Anyone convicted of possessing the drug can be jailed for up to five years, while the maximum penalty for trafficking offences is 14 years in prison.

The man died as the first day official day of music got underway at Worthy Farm, in Somerset.

Shape Created with Sketch. In pictures: Glastonbury 2014 Show all 65 left Created with Sketch. right Created with Sketch. Shape Created with Sketch. In pictures: Glastonbury 2014 1/65 Glastonbury 2014 A woman kicks water in a puddle at the Glastonbury Festival Getty Images 2/65 Glastonbury 2014 Fans enjoy the music as US singer Dolly Parton performs on the Pyramid Stage, on the final day of the Glastonbury Festival of Music and Performing Arts on Worthy Farm in Somerset 3/65 Glastonbury 2014 People gather below the Glastonbury sign at Worthy Farm in Pilton on the eve of the first day of the 2014 Glastonbury Festival 4/65 Glastonbury 2014 Performers in the Theatre Field at the Glastonbury Festival, at Worthy Farm in Somerset 5/65 Glastonbury 2014 People gather at Arcadia at Worthy Farm in Pilton during the 2014 Glastonbury Festival 6/65 Glastonbury 2014 Storms gather above the farm Leon Neal/AFP/Getty 7/65 Glastonbury 2014 ...while some take shelter Reuters 8/65 Glastonbury 2014 The crowd enjoy a spell of sunshine Getty Images 9/65 Glastonbury 2014 A wheelbarrow filled with rubbish sits near the Pyramid stage Reuters 10/65 Glastonbury 2014 A man pulls his child in a trailer Reuters 11/65 Glastonbury 2014 A man dressed in an orange suit watches Robert Plant on the Pyramid stage Reuters 12/65 Glastonbury 2014 Festivalgoers watch a laser show and pyrotechnics Reuters 13/65 Glastonbury 2014 Revellers take part in a 'random karaoke' in the 'Shangri-La' area Getty Images 14/65 Glastonbury 2014 Children wearing ear defenders on 27 June 2014 Reuters 15/65 Glastonbury 2014 The sun sets at Glastonbury Festival on 27 June 2014. AFP/Getty Images 16/65 Glastonbury 2014 Lightning in the sky over the Pyramid Stage shortly before it had to be powered down for safety reasons PA 17/65 Glastonbury 2014 Festival goers jump in mud at Worthy Farm during the 2014 Glastonbury Festival on June 27 Getty Images Europe 18/65 Glastonbury 2014 Flags flying high in the crowd at The Other Stage during a rare burst of sunshine Getty Images 19/65 Glastonbury 2014 As is tradition the heavens opened as a heavy rain storm hit the festival SWNS 20/65 Glastonbury 2014 The crowd enjoys the atmosphere during day 1 of the Glastonbury Festival Getty Images 21/65 Glastonbury 2014 Festival goers watch Blondie performing on the Other Stage, at the Glastonbury Festival, at Worthy Farm in Somerset Matt Crossick 22/65 Glastonbury 2014 The crowd watching the Kaiser Chiefs on the Other Stage, at the Glastonbury Festival, at Worthy Farm in Somerset 23/65 Glastonbury 2014 Festival goers shelter from the rain at the Glastonbury Festival 24/65 Glastonbury 2014 Women during a rain shower at the Glastonbury Festival 25/65 Glastonbury 2014 A woman walks during a rain shower at the Glastonbury Festival 26/65 Glastonbury 2014 A group of festival goers sit in a nest as revellers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm near Pilton in Somerset 27/65 Glastonbury 2014 Festival goers enjoy the sun ahead of predicted rain as revellers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm near Pilton in Somerset 28/65 Glastonbury 2014 Bluebell, aged 14 months from Norfolk, looks around as her mother takes part in an open-air yoga session in the Green Fields, as revellers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm near Pilton in Somerset 29/65 Glastonbury 2014 A child stands beside plastic cow provided by a mobile telecoms company enabling free wifi for festival goers as revellers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm near Pilton in Somerset 30/65 Glastonbury 2014 A sculpture by Banksy, entitled 'The Sirens of the Lambs', depicting a truck full of shrieking cuddly animals being driven to slaughter, drives around the Glastonbury Festival, at Worthy Farm in Somerset 31/65 Glastonbury 2014 A group of blacksmiths make tools on-site as revellers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm near Pilton in Somerset 32/65 Glastonbury 2014 A festival goer uses a hula hoop, as revelers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm in Somerset Getty Images 33/65 Glastonbury 2014 A man blows a bubble as the gates open at the Glastonbury Festival of Music and Performing Arts in Somerset 34/65 Glastonbury 2014 People gather to watch the sun set at Worthy Farm in Pilton on the first day of the 2014 Glastonbury Festival 35/65 Glastonbury 2014 The sun begins to set over the Tipi field, ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm in Somerset 36/65 Glastonbury 2014 A couple takes a photo while people gather to watch the sun set at Worthy Farm in Pilton on the first day of the 2014 Glastonbury Festival 37/65 Glastonbury 2014 A general atmosphere during the Glastonbury Festival at Worthy Farm 38/65 Glastonbury 2014 A man in a glowing suit walks among festival goers, as revelers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm in Somerset 39/65 Glastonbury 2014 A man in a spacesuit jumps from one of the standing stones in the stone circle, as revelers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm in Somerset 40/65 Glastonbury 2014 A girl uses a glowing hula hoop, as revellers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm in Somerset 41/65 Glastonbury 2014 An Airstream caravan that has been parked at the Pop-Up Hotel, which offers festival goers alternative luxury camping close to the Glastonbury Festival site - offering a array of facilities such as a reception and waiting area, 200-seat restaurant and bar, luxury showers, make-up areas, hairdresser and on on-site spa - is seen on the first day of the 2014 Glastonbury Festival 42/65 Glastonbury 2014 Festival goers enjoy the fine weather as the gates open at the Glastonbury Festival of Music and Performing Arts in Somerset 43/65 Glastonbury 2014 People sit in the sunshine as the Glastonbury Festival 44/65 Glastonbury 2014 People enjoy the fine weather as the gates open at the Glastonbury Festival 45/65 Glastonbury 2014 People enjoythe hot weather at the Glastonbury Festival, at Worthy Farm in Somerset PA 46/65 Glastonbury 2014 A woman relaxes in a hammock during the hot weather at the Glastonbury Festival, at Worthy Farm in Somerset 47/65 Glastonbury 2014 A view of the Glastonbury Festival, at Worthy Farm in Somerset 48/65 Glastonbury 2014 A festival goer erects a tipi at Worthy Farm in Somerset during the first day of the Glastonbury Festival 49/65 Glastonbury 2014 A woman adorns her tent with flags from different nations to celebrate the World Cup, at the Glastonbury Festival, at Worthy Farm in Somerset 50/65 Glastonbury 2014 Festival goers arrive with their tents and drink supplies as the gates open at the Glastonbury Festival 51/65 Glastonbury 2014 Festival goers arrive at Worthy Farm in Pilton for the first day of the 2014 Glastonbury Festival 52/65 Glastonbury 2014 Festival goers arrive at Worthy Farm in Pilton for the first day of the 2014 Glastonbury Festival 53/65 Glastonbury 2014 Stewards open the gates to ticket holders at Worthy Farm in Pilton on the first day of the 2014 Glastonbury Festival 54/65 Glastonbury 2014 Dancers at Arcadia rehearse at Worthy Farm in Pilton on the eve of the first day of the 2014 Glastonbury Festival 55/65 Glastonbury 2014 The sun shines through the Ribbon Tower in The Park at Worthy Farm in Pilton on the eve of the first day of the 2014 Glastonbury Festival 56/65 Glastonbury 2014 People arrive for the Glastonbury Festival 57/65 Glastonbury 2014 Festival goers help unload a charter coach as they arrive at Worthy Farm in Pilton for the first day of the 2014 Glastonbury Festival 58/65 Glastonbury 2014 Bryan Patterson (28) from Liverpool queues to get into Worthy Farm in Pilton for the first day of the 2014 Glastonbury Festival 59/65 Glastonbury 2014 Gates opened at the Somerset dairy farm that plays host to one of the largest music festivals in the world 60/65 Glastonbury 2014 Two women share a kiss below the Ribbon Tower in The Park at Worthy Farm in Pilton on the eve of the first day of the 2014 Glastonbury Festival 61/65 Glastonbury 2014 Festival goers arrive for the Glastonbury Festival 62/65 Glastonbury 2014 Festival goers (L to R) Liz, Lauren and Hannah, all from London, relax upon arriving for the Glastonbury Festival, at Worthy Farm in Somerset 63/65 Glastonbury 2014 People walk through the site at Worthy Farm in Pilton on the eve of the first day of the 2014 Glastonbury Festival 64/65 Glastonbury 2014 Festival goers board trains at Paddington station to travel to Castle Cary station for the first day of the 2014 Glastonbury Festival 65/65 Glastonbury 2014 Festival goers board trains at Paddington station to travel to Castle Cary station for the first day of the 2014 Glastonbury Festival 1/65 Glastonbury 2014 A woman kicks water in a puddle at the Glastonbury Festival Getty Images 2/65 Glastonbury 2014 Fans enjoy the music as US singer Dolly Parton performs on the Pyramid Stage, on the final day of the Glastonbury Festival of Music and Performing Arts on Worthy Farm in Somerset 3/65 Glastonbury 2014 People gather below the Glastonbury sign at Worthy Farm in Pilton on the eve of the first day of the 2014 Glastonbury Festival 4/65 Glastonbury 2014 Performers in the Theatre Field at the Glastonbury Festival, at Worthy Farm in Somerset 5/65 Glastonbury 2014 People gather at Arcadia at Worthy Farm in Pilton during the 2014 Glastonbury Festival 6/65 Glastonbury 2014 Storms gather above the farm Leon Neal/AFP/Getty 7/65 Glastonbury 2014 ...while some take shelter Reuters 8/65 Glastonbury 2014 The crowd enjoy a spell of sunshine Getty Images 9/65 Glastonbury 2014 A wheelbarrow filled with rubbish sits near the Pyramid stage Reuters 10/65 Glastonbury 2014 A man pulls his child in a trailer Reuters 11/65 Glastonbury 2014 A man dressed in an orange suit watches Robert Plant on the Pyramid stage Reuters 12/65 Glastonbury 2014 Festivalgoers watch a laser show and pyrotechnics Reuters 13/65 Glastonbury 2014 Revellers take part in a 'random karaoke' in the 'Shangri-La' area Getty Images 14/65 Glastonbury 2014 Children wearing ear defenders on 27 June 2014 Reuters 15/65 Glastonbury 2014 The sun sets at Glastonbury Festival on 27 June 2014. AFP/Getty Images 16/65 Glastonbury 2014 Lightning in the sky over the Pyramid Stage shortly before it had to be powered down for safety reasons PA 17/65 Glastonbury 2014 Festival goers jump in mud at Worthy Farm during the 2014 Glastonbury Festival on June 27 Getty Images Europe 18/65 Glastonbury 2014 Flags flying high in the crowd at The Other Stage during a rare burst of sunshine Getty Images 19/65 Glastonbury 2014 As is tradition the heavens opened as a heavy rain storm hit the festival SWNS 20/65 Glastonbury 2014 The crowd enjoys the atmosphere during day 1 of the Glastonbury Festival Getty Images 21/65 Glastonbury 2014 Festival goers watch Blondie performing on the Other Stage, at the Glastonbury Festival, at Worthy Farm in Somerset Matt Crossick 22/65 Glastonbury 2014 The crowd watching the Kaiser Chiefs on the Other Stage, at the Glastonbury Festival, at Worthy Farm in Somerset 23/65 Glastonbury 2014 Festival goers shelter from the rain at the Glastonbury Festival 24/65 Glastonbury 2014 Women during a rain shower at the Glastonbury Festival 25/65 Glastonbury 2014 A woman walks during a rain shower at the Glastonbury Festival 26/65 Glastonbury 2014 A group of festival goers sit in a nest as revellers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm near Pilton in Somerset 27/65 Glastonbury 2014 Festival goers enjoy the sun ahead of predicted rain as revellers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm near Pilton in Somerset 28/65 Glastonbury 2014 Bluebell, aged 14 months from Norfolk, looks around as her mother takes part in an open-air yoga session in the Green Fields, as revellers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm near Pilton in Somerset 29/65 Glastonbury 2014 A child stands beside plastic cow provided by a mobile telecoms company enabling free wifi for festival goers as revellers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm near Pilton in Somerset 30/65 Glastonbury 2014 A sculpture by Banksy, entitled 'The Sirens of the Lambs', depicting a truck full of shrieking cuddly animals being driven to slaughter, drives around the Glastonbury Festival, at Worthy Farm in Somerset 31/65 Glastonbury 2014 A group of blacksmiths make tools on-site as revellers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm near Pilton in Somerset 32/65 Glastonbury 2014 A festival goer uses a hula hoop, as revelers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm in Somerset Getty Images 33/65 Glastonbury 2014 A man blows a bubble as the gates open at the Glastonbury Festival of Music and Performing Arts in Somerset 34/65 Glastonbury 2014 People gather to watch the sun set at Worthy Farm in Pilton on the first day of the 2014 Glastonbury Festival 35/65 Glastonbury 2014 The sun begins to set over the Tipi field, ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm in Somerset 36/65 Glastonbury 2014 A couple takes a photo while people gather to watch the sun set at Worthy Farm in Pilton on the first day of the 2014 Glastonbury Festival 37/65 Glastonbury 2014 A general atmosphere during the Glastonbury Festival at Worthy Farm 38/65 Glastonbury 2014 A man in a glowing suit walks among festival goers, as revelers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm in Somerset 39/65 Glastonbury 2014 A man in a spacesuit jumps from one of the standing stones in the stone circle, as revelers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm in Somerset 40/65 Glastonbury 2014 A girl uses a glowing hula hoop, as revellers gather ahead of this weekends Glastonbury Festival of Music and Performing Arts on Worthy Farm in Somerset 41/65 Glastonbury 2014 An Airstream caravan that has been parked at the Pop-Up Hotel, which offers festival goers alternative luxury camping close to the Glastonbury Festival site - offering a array of facilities such as a reception and waiting area, 200-seat restaurant and bar, luxury showers, make-up areas, hairdresser and on on-site spa - is seen on the first day of the 2014 Glastonbury Festival 42/65 Glastonbury 2014 Festival goers enjoy the fine weather as the gates open at the Glastonbury Festival of Music and Performing Arts in Somerset 43/65 Glastonbury 2014 People sit in the sunshine as the Glastonbury Festival 44/65 Glastonbury 2014 People enjoy the fine weather as the gates open at the Glastonbury Festival 45/65 Glastonbury 2014 People enjoythe hot weather at the Glastonbury Festival, at Worthy Farm in Somerset PA 46/65 Glastonbury 2014 A woman relaxes in a hammock during the hot weather at the Glastonbury Festival, at Worthy Farm in Somerset 47/65 Glastonbury 2014 A view of the Glastonbury Festival, at Worthy Farm in Somerset 48/65 Glastonbury 2014 A festival goer erects a tipi at Worthy Farm in Somerset during the first day of the Glastonbury Festival 49/65 Glastonbury 2014 A woman adorns her tent with flags from different nations to celebrate the World Cup, at the Glastonbury Festival, at Worthy Farm in Somerset 50/65 Glastonbury 2014 Festival goers arrive with their tents and drink supplies as the gates open at the Glastonbury Festival 51/65 Glastonbury 2014 Festival goers arrive at Worthy Farm in Pilton for the first day of the 2014 Glastonbury Festival 52/65 Glastonbury 2014 Festival goers arrive at Worthy Farm in Pilton for the first day of the 2014 Glastonbury Festival 53/65 Glastonbury 2014 Stewards open the gates to ticket holders at Worthy Farm in Pilton on the first day of the 2014 Glastonbury Festival 54/65 Glastonbury 2014 Dancers at Arcadia rehearse at Worthy Farm in Pilton on the eve of the first day of the 2014 Glastonbury Festival 55/65 Glastonbury 2014 The sun shines through the Ribbon Tower in The Park at Worthy Farm in Pilton on the eve of the first day of the 2014 Glastonbury Festival 56/65 Glastonbury 2014 People arrive for the Glastonbury Festival 57/65 Glastonbury 2014 Festival goers help unload a charter coach as they arrive at Worthy Farm in Pilton for the first day of the 2014 Glastonbury Festival 58/65 Glastonbury 2014 Bryan Patterson (28) from Liverpool queues to get into Worthy Farm in Pilton for the first day of the 2014 Glastonbury Festival 59/65 Glastonbury 2014 Gates opened at the Somerset dairy farm that plays host to one of the largest music festivals in the world 60/65 Glastonbury 2014 Two women share a kiss below the Ribbon Tower in The Park at Worthy Farm in Pilton on the eve of the first day of the 2014 Glastonbury Festival 61/65 Glastonbury 2014 Festival goers arrive for the Glastonbury Festival 62/65 Glastonbury 2014 Festival goers (L to R) Liz, Lauren and Hannah, all from London, relax upon arriving for the Glastonbury Festival, at Worthy Farm in Somerset 63/65 Glastonbury 2014 People walk through the site at Worthy Farm in Pilton on the eve of the first day of the 2014 Glastonbury Festival 64/65 Glastonbury 2014 Festival goers board trains at Paddington station to travel to Castle Cary station for the first day of the 2014 Glastonbury Festival 65/65 Glastonbury 2014 Festival goers board trains at Paddington station to travel to Castle Cary station for the first day of the 2014 Glastonbury Festival

Police had arrested 30 people by Friday morning and 85 crimes were reported in the first 48 hours - 30 per cent down on last year.

Officers stressed that despite Glastonbury Festival's hippie reputation, there is a "zero tolerance policy" to illegal substances.

A statement from Avon and Somerset Police said: "No matter what myths you may have heard about police having a policy at Glastonbury of allowing people to smoke cannabis or take small amounts of other drugs – it is not true."

A 67-year-old woman died in her tent overnight on Wednesday but police are not investigating the death, which was believed to be of natural causes.