Ketek is under fire once again, this time due to a new warning of dangerous side effects issued by Health Canada.

Telithromycin users have been shown to be susceptible to severe, perhaps life-threatening liver damage. Ketek consumers have been urged to be aware of symptoms including fatigue, jaundice, dark urine, and loss of appetite.

Health Canada recommended that patients suffering from myasthenia gravis, a chronic autoimmune condition characterized by varying degrees of weakness in skeletal (voluntary) muscles, find alternatives to Ketek.

The FDA rejected Ketek in 2001, citing risks including liver damage and blurred vision.