You may report side effects to Health Canada at 1-866-234-2345. Before using undecylenic acid, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies.

You may report side effects to Health Canada at 1-866-234-2345. Before using undecylenic acid, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies.

Toelieva Antifungal Liquid Solution features another ingredient that kills toenail fungus, called undecylenic acid.