Ingredient

Acyclovir

Acyclovir is an antiviral medication used to treat viral infections.

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All medicines
119
Single ingredient
105
Combination
14
Prescription medication
67
OTC medication
52

MFDS ingredient code M081569

What does it do?

Acyclovir is an antiviral medication used to treat infections caused by the herpes virus family. It is primarily used to suppress viral replication in conditions such as herpes simplex, shingles, and chickenpox. This ingredient interferes with the virus's ability to replicate, reducing the spread of the infection.

Acyclovir disrupts the process by which the virus replicates its genetic material. When the virus is making DNA, acyclovir is inserted instead, blocking normal replication and suppressing viral proliferation. As a result, the amount of virus in the infected area decreases, alleviating symptoms.

Commonly used for

Approved uses differ by product. Check each product's information for its actual use.

Good to know

Acyclovir shows a specificity for the herpes virus compared to other antiviral medications. Additionally, it has minimal effects on human cells, resulting in relatively fewer side effects. This characteristic contributes to the widespread use of acyclovir in the treatment of viral infections.

Medicines containing this ingredient

Even with the same ingredient, strength, dosage form and how it is taken can differ.

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Dosage form
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119 total

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Even with the same ingredient, dosage and approved uses can differ by strength, dosage form and combined ingredients. Check each product's information before taking it.

Combined ingredients

Ingredients used together with this ingredient in combination products.

Questions about this ingredient

  • QIs it okay to use two different acyclovir products for cold sores?

    If you use two or more products containing acyclovir together, you will be using the same ingredient multiple times. The usage method varies by product, so please check each instruction manual and confirm with a pharmacist or prescribing physician whether they can be used together.

    Answers 1 · 2026.09.14

  • QWhat type of virus is acyclovir used for?

    Acyclovir is an antiviral agent used to treat infections caused by the herpes virus family, mainly for herpes simplex, shingles, and chickenpox. It works by interfering with the replication of the virus's genetic material, inhibiting its proliferation.

    Answers 1 · 2026.09.14

For anything that needs medical judgment, consult a doctor or pharmacist.

SourceKorea Ministry of Food and Drug Safety (Drug Safety Korea)

This drug information is based on data provided by the Korea Ministry of Food and Drug Safety.
Consult a doctor or pharmacist for accurate dosage, administration, and usage instructions.