What is acyclovir?
Acyclovir is an antiviral drug. It slows the growth and spread of the herpes virus so that the body can fight off the infection. Acyclovir will not cure herpes, but it can lessen the symptoms of the infection.
Acyclovir injection is used to treat severe infections caused by herpes viruses, including severe forms of genital herpes, shingles, herpes encephalitis (swelling of the brain), and herpes infections in people with other diseases that weaken the immune system.
Acyclovir may also be used for other purposes not listed in this medication guide.
What is the most important information I should know about acyclovir injection?
Use this medication for the full prescribed length of time. Your symptoms may improve before the infection is completely cleared. Acyclovir will not treat a viral infection such as the common cold or flu.
Treatment with acyclovir should be started as soon as possible after the first appearance of symptoms (such as tingling, burning, blisters).
Herpes infections are contagious and you can infect other people, even while you are being treated with acyclovir. Avoid letting infected areas come into contact with other people. Avoid touching an infected area and then touching your eyes. Wash your hands frequently to prevent passing the infection to others.
Acyclovir will not prevent the spread of genital herpes. Avoid sexual intercourse or use a latex condom to prevent spreading the virus to others.
What should I discuss with my healthcare provider before using acyclovir injection?
You should not use this medication if you are allergic to acyclovir or valacyclovir (Valtrex).
If you have any of these other conditions, you may need an acyclovir dose adjustment or special tests:
kidney disease (or if you are on dialysis);
liver disease;
a brain or nervous system disorder such as Parkinson's disease, schizophrenia, or tardive dyskinesia; or
an electrolyte imbalance (such as high or low levels of calcium, sodium, or potassium in your blood).
FDA pregnancy category B. This medication is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment. Herpes virus can be passed from an infected mother to her baby during childbirth. If you have genital herpes, it is very important to prevent herpes lesions during your pregnancy so that you do not have a genital lesion when your baby is born.
Acyclovir can pass into breast milk and may harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.