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AVIRAX

(Also Known As: ACYCLOVIR, ZOVIRAX)

Patient information about the treatment of herpes, chickenpox, or shingles is available with this medicine. Read it carefully before using this medicine.

Acyclovir is best used as soon as possible after the symptoms of herpes infection or shingles (for example, pain, burning, blisters) begin to appear.

If you are taking acyclovir for the treatment of chickenpox , it is best to start taking acyclovir as soon as possible after the first sign of the chickenpox rash, usually within one day.

Acyclovir capsules, tablets, and oral suspension may be taken with meals or on an empty stomach.

Acyclovir is best taken with a full glass (8 ounces) of water.

If you are using acyclovir oral suspension, use a specially marked measuring spoon or other device to measure each dose accurately. The average household teaspoon may not hold the right amount of liquid.

To help clear up your herpes infection, chickenpox, or shingles, keep taking acyclovir for the full time of treatment, even if your symptoms begin to clear up after a few days. Do not miss any doses. However, do not use this medicine more often or for a longer time than your doctor ordered.

Dosing

The dose of acyclovir will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of acyclovir. Your dose may be different if you have kidney disease. If your dose is different, do not change it unless your doctor tells you to do so.

The number of capsules or tablets or teaspoonfuls of suspension that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are taking acyclovir.

• For oral dosage forms (capsules, oral suspension, or tablets):
  • For treatment of genital herpes:
    • Adults and children 12 years of age and older 200 milligrams (mg) five times a day for ten days.
    • Children up to 12 years of age Use and dose must be determined by the doctor.
  • For prevention of recurrent outbreaks of genital herpes infections:
    • Adults and children 12 years of age and older 200 to 400 mg two to five times a day for five days or up to twelve months, depending on how often your outbreaks of infection occur.
    • Children up to 12 years of age Use and dose must be determined by the doctor.
  • For treatment of chickenpox:
    • Adults and children who weigh over 88 pounds (40 kilograms) 800 mg four times a day for five days.
    • Children 2 years of age and older and weighing 88 pounds (40 kilograms) or less Dose is based on body weight and must be determined by the doctor. The usual dose is 20 mg per kilogram (kg) of body weight, up to 800 mg, four times a day for five days.
    • Children up to 2 years of age Use and dose must be determined by the doctor.
  • For treatment of shingles:
    • Adults and children 12 years of age and older 800 mg five times a day for seven to ten days.
    • Children up to 12 years of age Use and dose must be determined by the doctor.
• For injection dosage form:
  • For treatment of herpes of the brain, genitals, or mucous membranes, or for the treatment of shingles:
    • Adults and children 12 years of age and older Dose is based on body weight and must be determined by the doctor. The usual dose is 5 to 10 mg of acyclovir per kg (2.3 to 4.5 mg per pound) of body weight, injected slowly into a vein over at least a one-hour period, and repeated every eight hours for five to ten days.
    • Children up to 12 years of age Dose is based on body weight and must be determined by the doctor. The usual dose is 10 mg to 20 mg of acyclovir per kg (4.5 mg to 9.1 mg per pound) of body weight, injected slowly into a vein over at least a one-hour period and repeated every eight hours for seven to ten days.
  • For treatment of widespread herpes virus infection in newborns:
    • Infants from birth to 3 months of age Dose is based on body weight and must be determined by the doctor. The usual dose is 10 mg of acyclovir per kg (4.5 mg per pound) of body weight, injected slowly into a vein over at least a one-hour period and repeated every eight hours for ten days.

Missed dose

If you do miss a dose of this medicine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.

Storage

To store this medicine:

• Keep out of the reach of children.
• Store away from heat and direct light.
• Do not store the capsule or tablet form of this medicine in the bathroom, near the kitchen sink, or in other damp places. Heat or moisture may cause the medicine to break down.
• Do not keep outdated medicine or medicine no longer needed. Be sure that any discarded medicine is out of the reach of children.

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, acyclovir has not been shown to cause birth defects or other problems in mice given many times the usual human dose, or in rats or rabbits given several times the usual human dose.

Breast-feeding Acyclovir passes into breast milk. However, it has not been reported to cause problems in nursing babies.

Children A limited number of studies have been done using oral acyclovir in children, and it has not caused different effects or problems in children than it does in adults.

Older adults Agitation, confusion, dizziness, and drowsiness may be especially likely to occur in elderly patients who are usually more sensitive than younger adults to the central nervous system effects of acyclovir.

Other medicines Although certain medicines should not be used together at all, in many cases two different medicines may be used together even if an interaction might occur. In these cases, changes in dose or other precautions may be necessary. If you are taking acyclovir it is especially important that your health care professional know if you are taking any of the following:

• Carmustine (e.g., BiCNU) or
• Cisplatin (e.g., Platinol) or
• Combination pain medicine containing acetaminophen and aspirin (e.g., Excedrin) or other salicylates or
• Cyclosporine (e.g., Sandimmune) or
• Deferoxamine (e.g., Desferal) (with long-term use) or
• Gold salts (medicine for arthritis) or
• Inflammation or pain medicine, except narcotics, or
• Lithium (e.g., Lithane) or
• Methotrexate (Mexate) or
• Other medicine for infection or
• Penicillamine (e.g., Cuprimine) or
• Plicamycin (e.g., Mithracin) or
• Streptozocin (e.g., Zanosar) or
• Tiopronin (Thiola) Concurrent use of these medicines with acyclovir may increase the chance for side effects, especially when kidney disease is present

• Dehydration or
• Kidney disease Dehydration or kidney disease may increase blood levels of acyclovir, increasing the chance of side effects

• Nervous system problems Acyclovir may make these problems worse