Health Canada is warning consumers against taking vpxl No. 1 Dietary Supplement for Men because it may pose serious health risks.

The federal agency said Monday the product, which has not been authorized for sale in Canada, contains tadalafil — a prescription medication that should only be taken under the supervision of a health care professional.

Patients who use the product may experience side-effects including temporary vision loss, seizure, prolonged erection, headache and abdominal pain. In patients with heart disease, use of tadalafil may result in cardiac death, heart attack, stroke, hypertension, chest pain and abnormal heartbeat. Patients taking nitrate drugs may also be in danger of developing life-threatening low blood pressure if they use the dietary supplement.

No adverse reactions have been reported in Canada.

Consumers using the product should speak with a health care professional about any concerns or call Health Canada at (613) 957-2991 or toll-free at 1-866-225-0709.

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