Honeymoon murder accused Shrien Dewani has been transferred to a secure mental health hospital after suffering an "adverse reaction" to his medication.

The British businessman, who is wanted in South Africa over claims he ordered the killing of his new bride there, was on bail at the Priory Hospital pending his extradition hearing.

After experiencing what his psychiatrist believed was a bad reaction to his anti-depressants over the weekend, a district judge ruled he should be moved to Cygnet Hospital Kewstoke in Somerset.

Dr Paul Dedman said it is likely he suffered an adverse reaction to the medication, according to sources close to Dewani.

Set in 16 acres of landscaped grounds overlooking the Bristol Channel, the Cygnet Hospital offers "a tranquil and therapeutic environment to provide care and treatment for those individuals with complex mental illness".

The majority of its beds are in a low secure setting but on site is also an intensive community rehabilitation service for men.

Dewani, 31, from Westbury-on-Trym in Bristol, is said to be suffering from severe post-traumatic stress syndrome after the shooting of his wife Anni Dewani, 28, in Cape Town last November.

The South African authorities want to extradite him and have made repeated courtroom bids to have him remanded in custody.

But at a hearing at Bristol Magistrates' Court, it was decided his psychiatric healthcare needs would be best met at the Cygnet Hospital, his brother Preyen Dewani said.

Mrs Dewani, from Sweden, was shot when a cab the couple were travelling in on their honeymoon was hijacked in the Gugulethu township.