What is acyclovir used for?

Acyclovir is an antiviral medication used to treat genital herpes, shingles (herpes zoster), and chickenpox. It helps outbreaks heal faster and can be taken daily to reduce how often genital herpes recurrences happen.

Does acyclovir cure herpes?

No. Acyclovir does not cure herpes infections — the virus remains in the body. It helps control outbreaks, reduce symptoms, and, when taken daily, lower the frequency of recurrences.

Do I need a prescription for acyclovir?

Yes. Acyclovir 400mg tablets require a valid prescription in the U.S. A licensed provider must review your health information and prescription before the pharmacy can dispense your medication.

How does ordering and shipping work?

After you submit your order and prescription, a licensed provider or pharmacist reviews it for safety and accuracy. Once approved, your medication ships from a licensed U.S. pharmacy directly to your address.

How should I take acyclovir 400mg?

Take it exactly as prescribed, with or without food, and drink plenty of water while on treatment. Start the medication as soon as possible after symptoms appear for the best results, and finish the full course even if you feel better.

What are the most common side effects of acyclovir?

The most common side effects are nausea, vomiting, diarrhea, headache, and general discomfort. Contact your provider if you notice decreased urination, confusion, or other unusual symptoms.

Is acyclovir the same as Zovirax?

Yes. Zovirax is the brand name for acyclovir. The generic tablet contains the same active ingredient and works the same way as the brand-name product.

Acyclovir 400mg

Name: Acyclovir 400mg
Brand: All Family Pharmacy
SKU: acyclovir-400mg
Availability: InStock

Generic For: Zovirax

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Acyclovir 400mg (brand name Zovirax) is a prescription antiviral tablet used to treat infections caused by herpes viruses, including genital herpes, shingles, and chickenpox. It works by slowing the growth and spread of the virus so outbreaks heal faster. After a licensed provider reviews your prescription, your order ships from a licensed U.S. pharmacy.

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Antiviral tablets (Zovirax) for genital herpes, shingles, and chickenpox

Medically reviewed by David Paul Mackarey, RPh, Pharmacist-in-Charge

Acyclovir 400mg Quick Facts

Drug class	Antiviral (nucleoside analog)
Treats	Genital herpes, shingles, chickenpox
Form	Tablet
Typical dosing	Take 1 tablet by mouth twice daily for 5-10 days.
Prescription required	Yes — prescription only

What Is Acyclovir 400mg?

Acyclovir is an antiviral medication in the nucleoside analog class, sold under the brand name Zovirax. It interferes with the ability of herpes viruses to copy themselves, which helps shorten outbreaks and reduce symptoms. Acyclovir 400mg tablets are commonly prescribed for genital herpes — both for treating outbreaks and for daily suppression — as well as for shingles and chickenpox. It does not cure herpes infections, but it can help manage them when taken as directed.

What Does Acyclovir 400mg Treat?

Genital herpes (initial and recurrent episodes)
Chronic suppression of recurrent genital herpes
Herpes zoster (shingles)
Chickenpox (varicella)

Acyclovir 400mg Dosage

Initial genital herpes: 200 mg orally every 4 hours, 5 times daily for 10 days
Chronic suppression: 400 mg orally twice daily for up to 12 months
Herpes zoster: 800 mg orally every 4 hours, 5 times daily for 7 to 10 days

Your prescriber will determine the dose and duration that are right for you. Always follow the directions on your prescription label.

Acyclovir 400mg Side Effects

Common side effects

Nausea
Vomiting
Diarrhea
Headache
Dizziness
Fatigue
General feeling of discomfort (malaise)

Serious side effects

Stop taking this medication and seek medical attention right away if you experience:

Signs of kidney problems (decreased urination, swelling, flank pain)
Confusion, hallucinations, or tremors
Unusual bruising or bleeding (possible blood disorder)
Severe allergic reaction (rash, swelling, trouble breathing)
Seizures

Warnings & Interactions

Do not use if allergic to acyclovir or valacyclovir
Use with caution in kidney disease; dose adjustment may be needed
Stay well hydrated to reduce the risk of kidney injury
Elderly patients may be more prone to neurologic side effects
Thrombotic thrombocytopenic purpura/hemolytic uremic syndrome (TTP/HUS) has been reported in immunocompromised patients
Caution with other kidney-affecting drugs (e.g., nephrotoxic agents, probenecid)
Does not prevent transmission of herpes to partners; avoid sexual contact during outbreaks

Tell your prescriber about all medications, supplements, and health conditions before starting acyclovir 400mg.