Honeymoon murder suspect Shrien Dewani has been arrested and placed on suicide watch following an altercation with a fellow patient at the Priory Hospital in Bristol.

The 31-year-old millionaire is reported to have got into a “heated discussion” over the weekend following a bad reaction to his medication.

Dewani, who was on bail pending a hearing to decide whether he will be extradited to South Africa, was transferred to a secure mental health hospital following the argument over the weekend.

The argument with a fellow patient was said to have been sparked by an ‘adverse reaction’ from Dewani to his medication.

Police would not confirm whether Dewani, 31, who is on suicide watch, attacked anyone or was attacked himself.

The British businessman is accused of ordered the killing of his new South African wife whilst on honeymoon in Cape Town.

A source close to him said: “He had a reaction to his medication, which meant he was loud and noisy.”

However he got into a row with a female resident who taunted him by saying: “You should go back to South Africa”.

Dewani’s mental and physical health is said to have deteriorated markedly since the shooting of his bride last November.

He is said to be suffering from severe post-traumatic stress syndrome.

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

Dewani remains subject to £250,000 bail and strict conditions including a curfew and the requirement that he report daily to a local police station.

His bride, from Sweden, was shot when a taxi the couple were travelling in on their honeymoon was hijacked in the Gugulethu township.

She was found dead in the back of the abandoned taxi with a bullet wound to her neck after cabbie Zola Tongo drove the newlyweds to the deprived township.

Dewani denies contracting the killing of his wife.