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. 2022 Aug 23;5(5):e798. doi: 10.1002/hsr2.798

Table 2.

Summary of the antiviral drugs that can be used in monkeypox infection

Sl. Antiviral drugs Alternative names Approval status Primary use Dose Mode of action Benefits Limitations
1 Cidofovir 47 VISTIDE US FDA Approved Indicated or the treatment of cytomegalovirus retinitis in AIDS patients The recommended dose of cidofovir is 5 mg/kg body weight (IV) once weekly. Cidofovir suppresses human cytomegalovirus replication by selective inhibition of viral DNA synthesis
  • Cidofovir has been shown to be effective against the virus that causes smallpox
  • It is also effective in treating animals that had diseases similar to smallpox
  • It has broad‐spectrum activity against DNA viruses, including herpes‐, adeno‐, polyoma‐, papilloma‐ and poxviruses
  • The safety and efficacy of cidofovir have not been established in patients with hepatic disease, pediatric patients, and geriatric patients.
  • It should be used with lower the risk of blindness and other vision problems.
  • Only IV dosage form is available
2 Brincidofovir 48 CMX001/TEMBEXA US FDA Approved For the treatment of human smallpox disease
  • Patients weighing 48 kg or above: 200 mg once weekly for two doses
  • Patients weighing 10 kg to less than 48 kg: 4 mg/kg once weekly for two doses
  • Patients weighing less than 10 kg: 6 mg/kg once weekly for two doses
Brincidofovir is an orthopoxvirus nucleotide analog DNA polymerase inhibitor against variola virus
  • It can be used in adult and pediatric patients, including neonates
  • It is available as oral suspension and tablets
  • Several animal model studies showed that brincidofovir is effective in monkeypox infection
  • The effectiveness of brincidofovir for treatment of monkeypox infection has not been determined in humans
  • Efficacy may be reduced in immunocompromised patients based on studies in immune deficient animals
3 Tecovirimat 49 ST‐246/TPOXX US FDA Approved (July 2018) Indicated for the treatment of human smallpox disease in adults andpediatric patients weighing at least 13 kg
  • Patients weighing 40 kg or above: 600 mg twice daily for 14 days
  • Patients weighing 25 kg to less than 40 kg: 400 mg twice daily for 14 days
  • Patients weighing 13 kg to less than 25 kg: 200 mg twice daily for 14 days
Tecovirimat is a novel tricyclonene compound that inhibits orthopoxvirus VP37 protein
  • It can be used in adult and pediatric patients
  • It is available as oral capsule
  • Several animal and human model studies showed that tecovirimat is effective in monkeypox infection
  • The effectiveness of tecovirimat for treatment of smallpox disease has not been determined in humans by adequate and well‐controlled clinical trials
  • Tecovirimat efficacy may be reduced in immunocompromised patients based on studies in immune deficient animals