Acyclovir is an antiviral agent that is active against the herpes virus infections of the genitals, skin, brain, and mucous membranes. The drug is also used to treat other viral infections such as shingles and chickenpox. Acyclovir is used both systematically and topically, but usually will only help with the symptoms and will not lead to a cure of the virus. Side effects include pain, swelling, increased thirst, loss of appetite, and nausea.

IMPORTANT NOTE: The following information is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. Consult your healthcare professional before using this drug.

ACYCLOVIR - ORAL (ay-SYE-klo-veer)

COMMON BRAND NAME(S): Zovirax

USES: Acyclovir is used to treat herpes infections of the skin, mouth, mucous membranes, genital herpes, herpes zoster (shingles), and chickenpox in some individuals. This medication does not cure herpes, but relieves the pain and may make the infection clear faster.

HOW TO USE: Begin taking Acyclovir as soon as symptoms appear. Take this medication as directed. Ask your doctor or pharmacist if you have any questions. Try to take the medication at evenly spaced intervals throughout the day and night. This will ensure a constant blood level of the medication and is most effective.

SIDE EFFECTS: Acyclovir may cause stomach upset, loss of appetite, nausea, vomiting, diarrhea, headache, dizziness or weakness. These effects should disappear in a few days as your body adjusts to the medication. If they persist or become worse, inform your doctor. Notify your doctor if you experience: numbness or tingling of the hands or feet, leg pain, sore throat, skin rash, change in the amount of urine. An allergic reaction to Acyclovir is unlikely, but seek immediate medical attention if it occurs. Symptoms of an allergic reaction include: rash, itching, swelling, dizziness, trouble breathing. If you notice other effects not listed above, contact your doctor or pharmacist.

PRECAUTIONS: Acyclovir should be used cautiously during pregnancy only if clearly needed. It is not known if this medication appears in breast milk. Consult with your doctor before breast-feeding.

DRUG INTERACTIONS: Inform your doctor about all the medicines you use (both prescription and nonprescription). Do not start or stop any medicine without doctor or pharmacist approval.

OVERDOSE: If overdose is suspected, contact your local poison control center or emergency room immediately. Symptoms of Acyclovir overdose may include sluggishness, change in amount of urine, loss of consciousness, or seizures.

NOTES: Avoid sexual activity while signs and symptoms of genital herpes are present to prevent infecting your partner. Inform your doctor if this medication does not appear to decrease the frequency or severity of recurrent infections.

MISSED DOSE: If you miss a dose, take as soon as remembered; do not take if it is almost time for the next dose, instead, skip the missed dose and resume your usual dosing schedule. Do not "double-up" the dose to catch up.

STORAGE: Store Acyclovir at room temperature away from sunlight and moisture.