Comparative Pharmacology
Head-to-head clinical analysis: FOSCAVIR versus VEKLURY.
Peer-Reviewed Evidence
Head-to-head clinical analysis: FOSCAVIR versus VEKLURY.
FOSCAVIR vs VEKLURY
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Foscarnet is a pyrophosphate analog that selectively inhibits viral DNA polymerase and reverse transcriptase by binding to the pyrophosphate binding site, preventing the cleavage of pyrophosphate from deoxynucleotide triphosphates, thereby inhibiting viral DNA synthesis. It does not require activation by viral thymidine kinase, making it active against acyclovir-resistant HSV and VZV, and ganciclovir-resistant CMV.
Remdesivir is a nucleotide analog prodrug that, after intracellular metabolism, incorporates into nascent viral RNA chains causing synthesis termination and inhibition of RNA-dependent RNA polymerase (RdRp). It targets the SARS-CoV-2 RdRp with selectivity over human RNA polymerases.
Induction: 60 mg/kg IV every 8 hours for 2-3 weeks, then maintenance: 90-120 mg/kg IV once daily. Administer as a 2-hour infusion via central line.
200 mg IV on Day 1, then 100 mg IV once daily for 5 to 10 days.
None Documented
None Documented
Terminal elimination half-life is approximately 3-5 hours in patients with normal renal function; can extend to 48-120 hours in severe renal impairment (CrCl <20 mL/min), requiring dose adjustment and therapeutic drug monitoring.
Remdesivir: ~1 hour (parent); GS-441524: ~27 hours (terminal). Context: GS-441524 accumulation may occur with daily dosing.
Primarily renal excretion (>80% as unchanged drug) via glomerular filtration and tubular secretion; minimal biliary/fecal elimination (<5%).
Renal: 10% unchanged remdesivir; 49% as metabolite GS-441524; 18% as other metabolites. Fecal: 47.5% as metabolites. Biliary: minor.
Category C
Category C
Antiviral
Antiviral