BOXED WARNING Hepatotoxicity (incl. acute liver failure) and embryofetal toxicity; contraindicated in severe hepatic impairment and in pregnancy — check LFTs before/after start, use accelerated elimination if injury or pregnancy occurs.
FDA dosing
Population
Start
Target
Max
Relapsing forms of multiple sclerosis
Adults
7 mg or 14 mg QD
7 mg or 14 mg QD
14 mg QD
Renal No adjustment needed
Hepatic No adjustment for mild–moderate; contraindicated in severe hepatic impairment
Instructions
Take with or without food
Obtain transaminase & bilirubin within 6 months before start; monitor ALT at least monthly for 6 months
Obtain CBC within 6 months before start
Screen for latent TB before starting
Check blood pressure before start and periodically
If liver injury suspected or pregnancy occurs, stop drug and start accelerated elimination (cholestyramine 8 g q8h or activated charcoal 50 g q12h x 11 days)
Contraindications
Severe hepatic impairment
Pregnancy, or females of reproductive potential not using effective contraception (fetal harm)
Pancreatitis (higher frequency in pediatric patients)
Adverse reactions
Headache
Diarrhea
Nausea
Alopecia
ALT increase
Pregnancy Contraindicated — teratogenic and embryolethal in animals at exposures at/below human; exclude pregnancy and use effective contraception; accelerated elimination if pregnancy occurs