A medication previously used to treat infections caused by viruses.


An antiviral agent used to treat various viral infections.


A nucleoside antibiotic isolated from Streptomyces antibioticus. It has some antineoplastic properties and has broad spectrum activity against DNA viruses in cell cultures and significant antiviral activity against infections caused by a variety of viruses such as the herpes viruses, the vaccinia VIRUS and varicella zoster virus.



For treatment of chickenpox - varicella, herpes zoster and herpes simplex


Vidarabine is a synthetic purine nucleoside analogue with in vitro and in vivo inhibitory activity against herpes simplex virus types 1 (HSV-1), 2 (HSV-2), and varicella-zoster virus (VZV). The inhibitory activity of Vidarabine is highly selective due to its affinity for the enzyme thy... Read more

Mechanism of action

Vidarabine stops replication of herpes viral DNA in 2 ways: 1) competitive inhibition of viral DNA polymerase, and consequently 2) incorporation into and termination of the growing viral DNA chain.
Vidarabine is sequentially phosphorylated by kinases to the triphosphate ara-ATP, which is the active... Read more


Systemetic absorption of vidarabine should not be expected to occur following ocular administration and swallowing lacrimal secretions.

Protein binding


Volume of distribution

Information currently not available.


Information currently not available.

Half life

Information currently not available.

Route of elimination

Information currently not available.


Acute massive overdosage by oral ingestion of the ophthalmic ointment has not occurred. However, the rapid deamination to arabinosylhypoxanthine should preclude any difficulty. The oral LD50 for vidarabine is greater than 5020 mg/kg in mice and rats. No untoward effects should result from... Read more

Adverse Effects


Information currently not available.

Food Interactions

    Information currently not available.


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  • Paracetamol(acetaminophen)
  • Paxil(paroxetine)
  • Pamelor(nortriptyline)
  • Panadol(acetaminophen)
  • Patanol(olopatadine ophthalmic)
  • Pataday(olopatadine ophthalmic)
  • Parnate(tranylcypromine)
  • Pazeo(olopatadine ophthalmic)
Vidarabine may decrease the excretion rate of Allopurinol which could result in a higher serum level.