Comparative Pharmacology
Head-to-head clinical analysis: FAVLYXA versus ZOVIRAX.
Peer-Reviewed Evidence
Head-to-head clinical analysis: FAVLYXA versus ZOVIRAX.
FAVLYXA vs ZOVIRAX
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Acyclic nucleoside phosphonate prodrug that inhibits viral RNA-dependent RNA polymerase (RdRP) by competing with adenosine triphosphate (ATP). It incorporates into nascent viral RNA causing chain termination after incorporation of the first 1-2 nucleotides.
After intracellular phosphorylation to acyclovir triphosphate, selectively inhibits viral DNA polymerase and incorporates into viral DNA, causing chain termination.
200 mg orally twice daily for 10 days.
Herpes simplex: 200 mg orally 5 times daily for 10 days; or 400 mg orally 3 times daily for 5-10 days. Herpes zoster: 800 mg orally 5 times daily for 7-10 days. IV: 5-10 mg/kg every 8 hours for immunocompromised patients with HSV/VZV.
None Documented
None Documented
Terminal elimination half-life approximately 5-7 hours in patients with normal renal function; prolonged in renal impairment (up to 24 hours in severe impairment).
Terminal elimination half-life is 2.5-3.3 hours in adults with normal renal function; prolonged to 19.5 hours in anuria (creatinine clearance <10 mL/min).
Primarily renal excretion of unchanged drug (approx. 85%) with biliary/fecal elimination accounting for the remainder (approx. 15%).
Renal excretion of unchanged drug via glomerular filtration and tubular secretion accounts for 76-82% of elimination; fecal excretion is less than 2%.
Category C
Category C
Antiviral
Antiviral