Acyclovir
Trade Name:
Zovirax
Type of Drug:
Acyclovir belongs to the general class of drugs called antiviral agents.
How Drug Works:
Acyclovir interferes with the virus making DNA, so the virus cannot reproduce. Acyclovir is used to treat herpes simplex, herpes zoster, and cytomegalovirus.
How Drug Is Given:
Acyclovir is given by mouth, by vein, or by applying ointment to the skin. The dose depends on your size, how it is given, and the reason you are taking the drug. If you are taking the oral form, keep the medicine in a tightly closed container away from heat and moisture and out of the reach of children and pets.
How Should I Take This Drug?
Take this drug exactly as directed by your doctor. If you do not understand the instructions, ask your doctor or nurse to explain them to you.
Read the following information. If you do not understand it or if any of it causes you special concern, check with your doctor.

Before taking this drug, tell your doctor if you are taking any other prescription or over-the-counter drugs, including vitamins and herbals.
Should I avoid any other medicines, foods, alcohol, and/or activities?
Your prescription and nonprescription medicines may interact with other drugs, causing harm. Certain foods or alcohol can also interact with drug products. Never begin taking a new medicine—prescription or nonprescription—without asking your doctor or nurse if it will interact with alcohol, food, or other medicines. Some drug products can cause drowsiness and affect activities such as driving.
Precautions:
All drugs used to fight microorganisms can cause allergic reactions. Stop the drug and tell your nurse or doctor right away if you develop a rash, hives, red blotches on your skin, difficulty breathing, or chest pain.
The dose of acyclovir will be reduced if you have any kidney problems. Your doctor will monitor your kidney function through blood tests while you are receiving acyclovir, especially when you receive it in the vein.
Tell all the doctors, dentists, and pharmacists you visit that you are taking this drug.
  • Most of the following side effects probably will not occur.
  • Your doctor or nurse will want to discuss specific care instructions with you.
  • They can help you understand these side effects and help you deal with them.
Side Effects:
Less Common Side Effects
  • Increase in kidney function blood and urine tests
  • Nausea
  • Vomiting
  • Diarrhea
  • Pain and irritation at place of injection
Rare Side Effects
  • Skin rash
  • Tremors
  • Hives
  • Itching
  • Dizziness
  • Confusion
  • Seizures
  • Tiredness (fatigue)
Side Effects / Symptoms of the Drug
Call your doctor or nurse right away if you develop rash, fever, or chills.
Other side effects not listed above can also occur in some patients. Tell your doctor or nurse if you develop any problems.
FDA Approval: Yes