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Home / Drugs / Starting with A / Aciclovir
 
Aciclovir
 

A guanosine analog that acts as an antimetabolite. Viruses are especially susceptible. Used especially against herpes. [PubChem]
BrandsAlti-Acyclovir
Avirax
Vipral
Virorax
Zovir
Zovirax
Zovirax topical
CategoriesAntiviral Agents
Nucleosides and Nucleotides
ManufacturersActavis elizabeth llc
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PackagersActavis Group
Advanced Pharmaceutical Services Inc.
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Amneal Pharmaceuticals
Apotex Inc.
Apotheca Inc.
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Hospira Inc.
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Patheon Inc.
PCA LLC
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Rebel Distributors Corp.
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Stason Pharmaceuticals Inc.
Teva Pharmaceutical Industries Ltd.
UDL Laboratories
Watson Pharmaceuticals
Xactdose Inc.
Yung Shin Pharmaceutical Industry Ltd.
Synonyms9-Hyroxyethoxymethylguanine
AC2
Aciclovier
Aciclovir Sodium
Acycloguanosine
Acyclovir
Acyclovir Sodium
Wellcome-248u

indication

For the treatment and management of herpes zoster (shingles), genital herpes, and chickenpox

pharmacology

Aciclovir (INN) or acyclovir (USAN, former BAN) is a synthetic deoxyguanosine analog and it is the prototype antiviral agent that is activated by viral thymidine kinase. The selective activity of aciclovir is due to its affinity for the thymidine kinase enzyme encoded by HSV and VZV.

mechanism of action

Viral (HSV-1, HSV-2 and VZV) thymidine kinase converts aciclovir to the aciclovir monophosphate, which is then converted to the diphosphate by cellular guanylate kinase, and finally to the triphosphate by phosphoglycerate kinase, phosphoenolpyruvate carboxykinase, and pyruvate kinase. Aciclovir triphosphate competitively inhibits viral DNA polymerase and competes with the natural deoxyguanosine triphosphate, for incorporation into viral DNA. Once incorporated, aciclovir triphosphate inhibits DNA synthesis by acting as a chain terminator.

toxicity

Aciclovir may cause nephrotoxicity (crystallization of aciclovir within renal tubules, elevation of serum creatinine, transient), and neurotoxicity (coma, hallucinations, lethargy, seizures, tremors). Nephrotoxicity and neurotoxicity usually resolve after cessation of aciclovir therapy. However, there is no well-defined relationship between aciclovir concentrations in the blood and these adverse effects.

biotransformation

Hepatic, the only major urinary metabolite that has been detected is 9-carboxymethoxymethylguanine.

absorption

Oral: bioavailability 10 to 20%

half life

2.5-3.3 hours

route of elimination

Acyclovir is cleared renally.

drug interactions

Aminophylline: Acyclovir increases the effect and toxicity of theophylline

Dyphylline: Acyclovir increases the effect and toxicity of dyphylline.

Oxtriphylline: Aciclovir may increase the effect and toxicity of oxtriphylline.

Theophylline: Acyclovir may increase the effect and toxicity of theophylline.