5-alpha-reductase inhibitor (type II)
Finasteride with liver impairment: dosing and safety
The liver is the main site of metabolism for many medications including Finasteride (Finasteride). Liver impairment slows clearance and can raise plasma levels of Finasteride above the intended range, amplifying side effects. People with chronic liver disease, recent hepatitis or significantly raised liver enzymes need a tailored approach to Finasteride at 1mg.
Why liver function matters
Finasteride undergoes hepatic metabolism through CYP enzymes for many medications. Reduced hepatic function slows this metabolism, prolongs the half-life and raises plasma concentrations. Finasteride binds with high affinity to 5-alpha-reductase type II, blocking the conversion of testosterone into DHT. The prescribing information typically classifies severity by Child-Pugh score (A mild, B moderate, C severe) and gives dose adjustments accordingly.
Practical guidance
According to the prescribing information for Finasteride, baseline liver function tests are recommended before starting Finasteride in any patient with risk factors and periodically during treatment in chronic liver disease. Severe impairment (Child-Pugh C) often contraindicates Finasteride or requires substantial dose reduction; mild impairment usually permits standard 1mg with closer monitoring.
Frequently asked questions
Is Finasteride safe with liver problems? ▾
Mild liver impairment typically allows Finasteride at standard or slightly reduced 1mg with monitoring. Moderate-to-severe impairment often requires substantial dose reduction. Severe (Child-Pugh C) impairment may contraindicate Finasteride entirely.
Will Finasteride damage my liver? ▾
Most 5-alpha-reductase inhibitor (type II) medications at standard 1mg doses do not harm a healthy liver. A small subset can produce drug-induced liver injury in susceptible patients, usually detected by routine ALT/AST monitoring. The prescribing information for Finasteride lists the documented risk.
Products containing Finasteride
More on Finasteride
- With alcoholFinasteride and alcohol — is it safe to drink?
- With foodShould Finasteride be taken with food?
- Side effectsFinasteride side effects: common, rare and warning signs
- Dosage guideFinasteride dosage guide: how much to take and when
- OnsetHow fast does Finasteride start working?
- DurationHow long does Finasteride last?
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