Some people taking terbinafine have developed severe liver damage leading to liver transplant or death.
Call your doctor at once if you have symptoms of liver damage, such as nausea, upper stomach pain, vomiting, loss of appetite, tiredness, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes). These events can occur whether or not you have ever had liver problems before.
Before taking this medicine
You should not use terbinafine if you are allergic to it, or if you have:
liver disease.
To make sure terbinafine is safe for you, tell your doctor if you have ever had:
liver problems;
weak immune system (caused by disease or by using certain medicine); or
lupus.
It is not known whether  terbinafine will harm an unborn baby. You should wait until after your pregnancy to start treating your nail or scalp infection with terbinafine. Tell your doctor if you are pregnant or plan to become pregnant during treatment.
Terbinafine can pass into breast milk and may harm a nursing baby. You should not breast-feed while using this medicine.
