Acyclovir 800mg
Generic For: Zovirax
Acyclovir 800mg (brand name Zovirax) is a prescription antiviral tablet used to treat infections caused by herpes viruses, including shingles, chickenpox, and genital herpes. It works by slowing the growth and spread of the virus so the body can manage the infection. After a licensed provider reviews your prescription, your order ships from a licensed U.S. pharmacy.
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10-day supply · $0.50/tablet
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Acyclovir is an antiviral medication used to treat shingles (herpes zoster), genital herpes, and chickenpox.
Acyclovir 800mg Quick Facts
| Drug class | Antiviral (nucleoside analogue) |
|---|---|
| Treats | Shingles, genital herpes, chickenpox |
| Form | Tablet |
| Typical dosing | Take 1 tablet by mouth 5 times daily for 10 days. |
| Prescription required | Yes — prescription only |
What Is Acyclovir 800mg?
Acyclovir is an antiviral medication in a class known as synthetic nucleoside analogues, sold under the brand name Zovirax. It is used to treat infections caused by certain herpes viruses, including herpes zoster (shingles), varicella (chickenpox), and genital herpes. Acyclovir does not cure herpes infections, but it can reduce the severity and duration of outbreaks. The 800mg tablet strength is most commonly prescribed for shingles and chickenpox.
What Does Acyclovir 800mg Treat?
Herpes zoster (shingles) in adults
Chickenpox (varicella)
Initial episodes of genital herpes
Recurrent episodes of genital herpes
Chronic suppressive therapy for recurrent genital herpes
Acyclovir 800mg Dosage
Shingles: 800 mg by mouth every 4 hours, 5 times daily, for 7–10 days
Chickenpox: 800 mg by mouth 4 times daily for 5 days
Genital herpes (initial episode): 200 mg by mouth every 4 hours, 5 times daily, for 10 days
Your prescriber will determine the dose and duration that are right for you. Always follow the directions on your prescription label.
Acyclovir 800mg Side Effects
Common side effects
- Nausea
- Vomiting
- Diarrhea
- Headache
- General feeling of discomfort (malaise)
- Dizziness
- Fatigue
Serious side effects
Stop taking this medication and seek medical attention right away if you experience:
- Kidney problems (decreased urination, swelling, flank pain)
- Severe allergic reaction (rash, hives, swelling, trouble breathing)
- Confusion, hallucinations, or agitation
- Tremors or seizures
- Signs of thrombotic thrombocytopenic purpura/hemolytic uremic syndrome (unusual bruising, fatigue, fever)
Warnings & Interactions
Do not use if allergic to acyclovir or valacyclovir
Kidney injury can occur; stay well hydrated during treatment
Dose adjustment needed for patients with reduced kidney function
Use caution in elderly patients; higher risk of kidney and nervous system effects
Neurologic effects (confusion, hallucinations) may occur, especially with kidney impairment
Tell your provider about all medications, including probenecid and other drugs affecting the kidneys
Thrombotic thrombocytopenic purpura/hemolytic uremic syndrome has been reported in immunocompromised patients
Tell your prescriber about all medications, supplements, and health conditions before starting acyclovir 800mg.
Sources & References
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