Negara: Australia
Bahasa: Inggris
Sumber: Department of Health (Therapeutic Goods Administration)
Aciclovir
GlaxoSmithKline Australia Pty Ltd
Medicine Registered
1 ZOVIRAX ® TABLETS NAME OF THE DRUG: Aciclovir DESCRIPTION: Aciclovir is a synthetic acyclic purine nucleoside analogue. Its chemical name is 9-((2- hydroxyethoxy)methyl)guanine. It is a white crystalline powder slightly soluble in water and practically insoluble in most organic solvents. The chemical structure of aciclovir is: N HN N N O H 2 N O HO Each tablet contains 200mg, 400 mg or 800 mg of aciclovir. PHARMACOLOGY: MICROBIOLOGY: Aciclovir is an antiviral agent which is active _in vitro_ against _Herpes simplex_ virus (HSV) types I and II and _Varicella zoster_ virus (VZV), the latter being considerably less sensitive. The relationship between the level of _in vitro_ sensitivity of herpes viruses to aciclovir and clinical response to therapy has not been adequately established. Development of resistance by HSV to aciclovir has been documented. Aciclovir needs to be phosphorylated to the active compound, aciclovir triphosphate, in order to become active against the virus. Such conversion is very limited in normal cells and in addition cellular DNA polymerase is not very sensitive to the active compound. However, in infected cells HSV or VZV-coded thymidine kinase facilitates the conversion of aciclovir to aciclovir monophosphate which is then converted to aciclovir triphosphate by cellular enzymes. Aciclovir triphosphate acts as an inhibitor of, and substrate for, the herpes-specified DNA polymerase, preventing further viral DNA synthesis. PHARMACOKINETICS: Aciclovir is on Baca dokumen lengkapnya