Consumers taking a weight-loss product should avoid an unauthorized product sold online that contains BZP, Health Canada says.

The capsules are called RevolutionDS Weight Loss and contain a synthetic substance known as benzylpiperazine, or BZP, the regulator said Thursday.

BZP may cause:

• Increased body temperature.
• Increased blood pressure.
• Dilated pupils.
• Increased euphoria.
• Alertness.
• Paranoia.

Health Canada is assessing whether to add BZP to a list of substances included in the Controlled Drugs and Substances Act.

People who take the recommended dose on the label of the products could be associated with serious and life-threatening health consequences, Health Canada warns.

There is a Canadian report of cardiac arrhythmia or abnormal electrical activity of the heart associated with the use of RevolutionDS Weight Loss.

BZP may also negatively interact with alcohol and prescription drugs, and scientific data suggests it has abuse potential given its amphetamine-like effects, Health Canada said.

The products is distributed by a website called revolutionds.com. Health Canada said the contact person listed on the website "has not been forthcoming in providing all required information to effectively recall the unauthorized product."

Anyone who has used the product and is concerned is advised to consult a health-care practitioner.

All drugs and natural health products that are authorized for sale in Canada carry an eight-digit identification number on the label.