Brits have been warned against the use of an anti-obesity pill that is available for general sale without prescription.
Drug safety regulators fear the slimming tablet Alli could lead to numerous disorders, including pancreatitis, kidney stones, liver problems or severe fits in people with epilepsy.
According to new data, there are 31 reported cases of adverse reactions since the pill hit pharmacies in January last year.
Alli (generic name orlistat) was an instant hit with the overweight, who could buy them for just 50pound a month, without a full consultation with their GP.
However, the evidence against the pill has been growing.
The 31 adverse reactions include palpitations, tummy problems and swollen tongues.
Patients who take a common drug for the treatment of thyroid problems are also being told to take a doctor's advice because the medicines could interact badly.
And because diarrhoea is a common side-effect, women have been cautioned the pill could lessen the effectiveness of the contraceptive Pill.
American health watchdogs are looking into any links to liver disease, while European researchers disagree.