Acyclovir (Systemic).

 
In the U.S. -- 
     Zovirax 
 
In Canada -- 
     Alti-Acyclovir 
     Avirax 
     Zovirax 
     Zovirax Wellstat Pac 
     Zovirax Zostab Pac 

Another commonly used name is aciclovir .

 
     Antiviral, systemic 
Description 

Acyclovir (ay-SYE-kloe-veer) belongs to the family of medicines called antivirals, which are used to treat infections caused by viruses. Usually these medicines work for only one kind or group of virus infections.

Acyclovir is used to treat the symptoms of chickenpox, shingles, herpes virus infections of the genitals (sex organs), the skin, the brain, and mucous membranes (lips and mouth), and widespread herpes virus infections in newborns. Acyclovir is also used to prevent recurrent genital herpes infections. Although acyclovir will not cure herpes, it does help relieve the pain and discomfort and helps the sores (if any) heal faster.

Acyclovir may also be used for other virus infections as determined by your doctor. However, it does not work in treating certain virus infections, such as the common cold.

Acyclovir is available only with your doctor's prescription, in the following dosage forms:

 
Oral 
 
     Capsules (U.S.) 
 
     Oral suspension (U.S. and Canada) 
 
     Tablets (U.S. and Canada) 
Parenteral 
 
     Injection (U.S. and Canada) 
Before Using This Medicine 

In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For acyclovir, the following should be considered:

 
Allergies -- 

Tell your doctor if you have ever had any unusual or allergic reaction to acyclovir or valacyclovir. Also tell your health care professional if you are allergic to any other substances, such as foods, sulfites or other preservatives, or dyes.

 
Pregnancy -- 

Acyclovir has been used in pregnant women and has not been reported to cause birth defects or other problems. However, studies have not been done in humans. Studies in rats and rabbits have shown that acyclovir given by injection may keep the fetus from becoming attached to the lining of the uterus (womb). However, …