Daniel Grzybowski first wrongly wrote out a prescription for an anti-obesity treatment after carrying out research over the internet, it is claimed.

He then prescribed another drug and became annoyed when the chemist at Superdrug in Grantham, refused to dispense it, the General Dental Council heard.

Grzybowski is said to have lost his temper, threatened to report her, told her she was 'in serious trouble' and claimed he could prescribe anything he liked.

The dentist, who qualified in Poland in 2000, was working for A. Smith and Associates Dental Surgery in Avenue Road, Grantham.

Jonathan Barnard, for the GDC, said: "On November 15, Mr Grzybowski was consulted by a 25-year-old patient of his, a friend from the gym.

"They spoke in Russian, and Mr Grzybowski had previously treated him for a tooth abscess.

"Patient A told him he was unhappy with being obese and addicted to nicotine and asked Mr Grzybowski if he could do something to help.

"Mr Grzybowski told him he would be better off speaking to a GP, but Patient A replied that he had only just moved to the UK and was not yet registered at a GP surgery.

"Mr Grzybowski then concluded that he was the only professional person who could offer this patient some assistance, even though he had no competence or experience in smoking cessation, and this could not be described as an emergency.

"So he educated himself by use of the internet and called Patient A with the results of his net search and gave him a prescription for Rimonabant, the drug he had decided on."

The GDC panel was told that Rimonabant, an anti-obesity drug, was not licensed for helping stop smoking and can frequently cause psychiatric illness.

Mr Barnard told the panel it could only be used with patients who have previously suffered psychiatric problems if there is no other alternative.

"There is absolutely no record that Mr Grzybowski took any history at all from patient A to investigate his psychiatric background,' he said.

When Patient A took the prescription to Superdrug in Grantham, the pharmacist told him she did not have Rimonabant in stock.

Patient A then returned to Grzybowski who wrote out a prescription for Varenicline, a drug whose side effects can include significant weight gain, the hearing was told.

Mr Barnard said: "This time, Mr Grzybowski took the decision to accompany Patient A to the pharmacy.

"What was in the mind of this man as he strode to the pharmacy with his friend from the gym by his side? Was the germ of aggression that was to show itself in the pharmacy already planted as he walked?

"When the men arrived at Superdrug with the second prescription, Mrs Patel told them that she was not happy that yesterday it had been an anti-obesity drug and today it was a smoking cessation drug.

"Mr Grzybowski has admitted he became annoyed and stormed out, only to come back a few minutes later to find out Mrs Patel's name and tell her he was going to report her and that she would be in serious trouble.

"He very quickly became angry, aggressive and intimidating."

The dentist also aggressively shouted at Mrs Patel that she did not know how to do her job, it was claimed.

Grzybowski, of Avenue Road, Grantham, admits prescribing Rimonabant and failing to record the prescription for Rimonabant in Patient A's notes.

He further admits having a verbal exchange with Mrs Patel in the public area of the pharmacy, telling her that she would be in serious trouble, losing his temper and raising his voice.

But he denies having insufficient experience or competence to prescribe Rimonabant and Varenicline and failing to make an appropriate assessment of Patient A's history.

He further denies making Mrs Patel feel threatened and scared.

The hearing continues.

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