Aciclovir is used to treat two common viral infections - varicella-zoster and herpes simplex. The varicella-zoster virus is the cause of chickenpox and shingles. Herpes simplex viruses cause cold sores and herpes. Aciclovir works by preventing viruses from multiplying, and this reduces the severity of the infection and stops it from spreading. As well as treating infections, aciclovir can also be prescribed to prevent some viral infections from occurring. This is particularly the case in people who have a lowered immune system.
Although some herpes infections (for example, cold sores) can be treated with creams or ointments, more severe infections need to be treated with tablets or medicine taken by mouth. This leaflet provides information on how to take aciclovir tablets and medicine. http://buygenericmd.com/
Information about the topical forms of aciclovir (creams and ointments) is not included in this leaflet. See the separate medicine leaflets called Aciclovir cream and Aciclovir eye ointment for more information about how to use these preparations.