Aciclovir

Aciclovir (ACV), also known as acyclovir in the US, is an antiviral medication. It is mostly used to treat herpes simplex virus and varicella zoster viruses (chickenpox or shingles). It also has some activity against cytomegalovirus and Epstein-Barr virus. Aciclovir is a nucleic acid analogue made from guanosine. It works by decreasing the production of the virus' DNA.

Mechanism of action
Acyclovir inhibits herpes simplex virus replication, a herpesvirus.

Acyclovir targets the viral DNA polymerase, inhibiting enzyme function by competitive inhibition.

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 * Wikipedia - Aciclovir