Health Canada is warning consumers that six unauthorized erectile dysfunction treatments could cause serious side effects including tissue damage.

The federal agency warns that Power 58 Extra, Platinum Power 58 Extra, Enhanix New Extra Men's Formula, Valentino, King Power Oral Solution and Stretch Up Capsules contain sildenafil and vardenafil. These medications, prescribed for erectile dysfunction, should only be taken under the recommendation of a doctor.

Possible side effects include headache, flushing, gastrointestinal disorders, penile tissue damage, visual problems and inflammation of mucous membrane in the nose. Patients taking nitrate medication should also avoid using products with sildenafil citrate or vardenafil hydrochloride.

The federal agency notes travellers may have brought the pills into the country or consumers may have purchased them online.

No adverse reactions have been reported in Canada.

Consumers using the supplements should stop using them and are advised to consult a doctor with any related concerns.

Recall notice