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Key Factors Affecting How Long Famciclovir Stays in Your System:
Half-Life:

Famciclovir: ~2 hours (rapidly converts to penciclovir).

Penciclovir (active form): ~10–20 hours in healthy adults.

It takes about 5 half-lives for a drug to be mostly eliminated, so penciclovir clears in roughly 2–4 days.

Kidney Function:

If you have impaired kidney function, elimination slows, extending its presence in the body.

Dosage & Duration:

Higher doses or prolonged use may take slightly longer to clear.

Metabolism:

Individual variations in metabolism can affect clearance time.

Detection in Drug Tests:
Famciclovir is not typically screened in standard drug tests. However, specialized tests could detect it if specifically targeted (uncommon).