The Department of Health has ordered the recall of a slimming product after it was found to contain a drug that could raise blood pressure and heart rate. Trim Up Plus Bird's Nest is being sold as a health product but department tests showed it contains the western drug, sibutramine. Products containing the anti-obesity drug must be registered under the Poisons and Pharmacy Ordinance and must only be sold on a doctor's prescription, a department spokesman said. 'Sibutramine is an appetite suppressant. Its adverse effects include increased blood pressure and heart rate,' the spokesman said. People with heart or circulation problems should not take it. Sibutramine works by affecting levels of the brain chemical serotonin, decreasing appetite by making users feel full. The mainland-made Trim Up Plus has been on Hong Kong shelves since August. The importer told the department that 100 boxes, selling for $598 each, had been imported. Seventy-five had already been recalled, a department spokesman said. Buyers of Trim Up Plus should immediately stop using the product and seek medical advice if they feel unwell. They can call the department hotline on 2319 2839 or the importer on 2660 0688. Users are advised to dispose of the product, return it to the importer or to the Department of Health's Pharmaceutical Service on the third floor of the Public Health Laboratory Centre, 382 Nam Cheong Street, Kowloon. Importers and retailers of unregistered pharmaceutical products are liable to a maximum fine of $100,000 and two years' imprisonment if convicted.