Man, 84, is hospitalised after drinking liquorice tea twice a day for a fortnight caused his blood pressure to spike to dangerous levels
- The unnamed patient had already been diagnosed with high blood pressure
- Doctors who treated him revealed he had managed to control his condition
- He was concerned when his blood pressure had been high for an entire week
- The man went to the emergency department at McGill University in Montreal
- He admitted to drinking a home-made liquorice brew twice a day for two weeks
An elderly man spent two weeks in hospital after drinking liquorice tea caused his blood pressure to spike to dangerous levels.
The unnamed 84-year-old had already been diagnosed with high blood pressure, known medically as hypertension, before his ordeal.
Doctors who treated him revealed he had managed to control his condition in the months leading up to his 13-day hospital stay.
But his love of his home-made liquorice brew caused his systolic reading – the top number – to spike to as high as 210mmHg.
An elderly man spent two weeks in hospital after drinking liquorice tea caused his blood pressure to spike to dangerous levels
Anything above 180 is known as a hypertensive crisis, which can be life-threatening and cause an array of symptoms, including head aches.
The man, however, was not aware his drink was to blame – despite knowing of the link between liquorice and high blood pressure.
The patient took measurements of his blood pressure at home for an entire week, which showed persistently elevated measurements.
He went to the emergency department at McGill University in Montreal because of his concerns his blood pressure readings were so high.
The man also complained of headaches, light sensitivity, chest pain and fatigue – all are symptoms of a hypertensive crisis.
Medics who initially examined him found his blood pressure was 196/66mmHg, he also showed signs of fluid retention in his calves.
Other examinations showed he had a low potassium level of 2.5mmol/L – below the recommended 3.5-5mmol/L.
‘Excessive amounts of some herbal products can have harmful side effects,’ said Dr Jean-Pierre Falet, one of the authors of the case report.
‘Products containing licorice root extract can raise blood pressure, cause water retention and decrease potassium levels if consumed in excess.
‘Given Canada’s multicultural population, physicians should consider screening for licorice root intake in patients with difficult-to-control hypertension.’
Writing in the Canadian Medical Association Journal, medics said he took a blood pressure reading four months earlier of 125/60mmHg.
His initial symptoms resolved after just 24 hours in hospital. However, his shortness of breath stayed with him for several days.
The man then admitted to doctors, when questioned, that he had consumed a home-made liquorice root extract daily.
He revealed he drunk an ‘erk sous’ extract up to twice a day for two weeks before going to hospital with dangerously high blood pressure.
Writing in the medical journal, doctors revealed the patient knew of the link between liquorice and high blood pressure.
However, the team who treated him said: ‘He did not think of it when he noticed his blood pressure starting to rise.’
The man did not consume any liquorice while he was in hospital. His blood pressure gradually improved after almost two weeks in care.
He was sent home on a cocktail of drugs, which he had to take alongside the remainder of his usual medications.
The patient returned to clinic three weeks later. Dr Falet and team said his blood pressure was 110/57mmHg and he felt well.
He had not taken any licorice extract since his hospital admission and his potassium level returned to normal (3.8 mmol/L).