Traditional herbal remedies are being used as alternative medicine by a large proportion of people worldwide. Herbs are generally considered as safe and free of side effects, because of their natural origin. The presented case, a 36 years old woman, had used a herbal medicine, called "Lida Dai Hua Jiao Nang" via internet for weight reduction. Although, she developed severe headache, vertigo, dyspnea, arythmia and sleeplessness on the second day, she kept on taking the product for ten days. However; due to worsening in symptoms, she was admitted to our hospital. A urine sample of the case and a capsule of "LiDa" were analyzed by gas chromatography mass spectrometry (GC-MS). Sibutramine was detected in urine, which was also detected as major ingredient of "LiDa". It was quantified as at least 22 mg in each capsule of "LiDa". There are lots of herbal products used for the purpose of weight loss. Due to convincing numbers reports dealing with adverse effects, sales of these hinds of products are forbidden in most of the countries. However, they are still available to consumers over the internet.

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