No, you should not take Lamisil (terbinafine) when your bilirubin is elevated.
Systemic terbinafine is not recommended in patients with active or chronic liver disease, and elevated bilirubin indicates hepatic dysfunction that contraindicates its use 1.
Why Terbinafine is Contraindicated with Elevated Bilirubin
Hepatotoxicity Risk
Terbinafine carries a well-documented risk of serious hepatic toxicity, which occurs predominantly in patients with pre-existing liver disease 1. The British Association of Dermatologists guidelines explicitly state that terbinafine clearance is decreased in patients with severe liver or kidney disease, and rare reports of serious hepatotoxicity have occurred usually in patients with pre-existing liver disease 1.
Clinical Evidence of Harm
Multiple case reports demonstrate the serious consequences of using terbinafine in patients with liver dysfunction:
Progressive cholestatic injury: A 62-year-old woman developed severe cholestatic drug-induced liver injury with markedly elevated alkaline phosphatase and total bilirubin, requiring repeat liver biopsy and nearly progressing to acute liver failure 2
Autoimmune hepatitis: A patient with chronic hepatitis B developed terbinafine-induced autoimmune hepatitis with peak bilirubin of 5.9 mg/dL, requiring supportive care including vitamin K for coagulopathy 3
Marked cholestasis: A 41-year-old developed significant elevation of total bilirubin after terbinafine use, with liver biopsy showing marked cholestasis including bile plugs and bile granulomas 4
Guideline Recommendations
The British Association of Dermatologists (2014) provides clear contraindications 1:
- Hepatic impairment is listed as a contraindication for terbinafine
- Baseline liver function tests are recommended in patients with history of heavy alcohol consumption, hepatitis, or haematological abnormalities
- The guidelines emphasize this applies to both adults and children
What This Means for Your Situation
If Your Bilirubin is Already Elevated:
- Do not start terbinafine - elevated bilirubin indicates existing hepatic dysfunction, whether from cholestasis, hepatocellular injury, or biliary obstruction
- Investigate the cause of your elevated bilirubin first - this could represent conjugated hyperbilirubinemia from liver parenchymal disease, biliary obstruction, or other hepatobiliary pathology 5
- Consider alternative treatments for fungal infections, such as topical therapies (amorolfine 5% lacquer or ciclopirox 8% lacquer) that avoid systemic exposure 1
The One Exception with Extreme Caution
There is a single case report of terbinafine being used successfully in a patient with stable autoimmune hepatitis 6. However, this required:
- Consultation with a hepatologist
- Limiting exposure to less than 6 weeks
- Close monitoring of liver function tests
- Extensive patient education on signs of liver injury
This exception should only be considered in stable, chronic liver disease under hepatologist supervision, not in the setting of acutely elevated bilirubin.
Alternative Approaches
For Onychomycosis (Nail Fungus):
- Topical therapy: Amorolfine 5% lacquer applied once or twice weekly for 6-12 months 1
- Ciclopirox 8% lacquer: Applied once daily for up to 48 weeks 1
- Itraconazole: May be considered if hepatic function improves, though it also requires monitoring for hepatotoxicity 1
Critical Pitfall to Avoid
Do not assume that "mild" bilirubin elevation is safe for terbinafine use. The timeline of drug-induced liver injury varies significantly, with most cases occurring between 4-6 weeks of treatment 7. Patients with pre-existing hepatic dysfunction are at highest risk for severe outcomes, including potential acute liver failure, need for transplantation, or death 2.
The risk-benefit ratio clearly favors avoiding terbinafine when bilirubin is elevated, as fungal nail infections are not life-threatening and safer alternatives exist.