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Health Canada warns Canadians not to use “Thermonex”

Starting date:
May 28, 2004
Posting date:
May 28, 2004
Type of communication:
Source of recall:
Health Canada
Product Safety
General Public
Identification number:

Health Canada is warning consumers not to use Thermonex capsules, which are being advertised for weight loss, water loss and to help boost thyroid output. This product could cause serious adverse effects, including death.

Thermonex contains synephrine, which is similar to ephedrine and may have similar adverse effects such as hypertension and cardiovascular toxicity. These adverse effects could lead to stroke, heart attack and/or death. Health Canada has previously advised consumers against the use of ephedrine-containing products, especially those containing caffeine and other stimulants. Thermonex also contains high levels of the stimulant caffeine and other ingredients which increase the effects of synephrine. Many other health products advertised for weight loss, and containing "bitter orange extract" may also contain synephrine.

Thermonex is manufactured by BSN Inc. in the U.S. While it is not yet known if this product is currently being sold in Canada, shipments of Thermonex have been refused at the Canadian border. Health Canada has issued a Customs Alert to prevent shipments of this product from entering the country. Should Health Canada become aware of this product being sold in Canada, appropriate action will be taken to ensure its removal from the market. Health Canada asks that consumers report retail outlets that carry this product by calling 1-800-267-9675.

If consumers have concerns about Thermonex or similar products that contain synephrine, especially those containing caffeine and other stimulants, they should consult a pharmacist or physician.

Health Canada advises consumers, particularly those with pre-existing conditions such as heart disease, hypertension, thyroid disease, diabetes, enlarged prostate, anxiety and restlessness, glaucoma and pheochromocytoma (a type of adrenal gland tumour), to consult a physician prior to the use of any product marketed for weight loss, body building and increased energy.

Consumers and health care professionals may report adverse reactions related to weight loss products containing synephrine toll-free to Health Canada by telephone (866) 234-2345 or fax (866) 678-6789.

Media enquiries

Jirina Vlk
Health Canada
(613) 957-2983

Public enquiries

(613) 957-2991


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