Zovirax (Acyclovir)

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Acyclovir is an acyclic purine nucleoside. Its antiviral activity depends upon intracellular phosphorylation to its triphosphate derivative. Because of its higher affinity for viral thymidine kinase, Acyclovir is phosphorylated at a much higher rate by the viral enzyme. Thus, it is almost exclusively active in infected cells, fulfilling one of the selectivity principles of antiviral drugs.

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Neurotoxicity secondary to aciclovir is rare and is associated with high plasma concentrations, such as result from impaired renal function. Although the risk is greatest with intravenous administration, neurotoxicity has previously been noted with oral use. Symptoms of neurotoxicity, which usually appear within the first 24-72 hours of administration, include tremor, myoclonus, confusion, lethargy, agitation, hallucinations, dysarthria, asterixis, ataxia, hemiparesthesia, and seizures.