Zovirax vs. Valtrex

Are Zovirax and Valtrex the Same Thing?

Zovirax (acyclovir) and Valtrex (valacyclovir) are antiviral medications that interfere with the replication of herpes viruses and are used to treat shingles, chickenpox, cold sores, and genital herpes.

What Are Possible Side Effects of Zovirax?

Common side effects of Zovirax include:

Serious side effects of Zovirax include renal function problem.

What Are Possible Side Effects of Valtrex?

Common side effects of Valtrex include:

What is Zovirax?

Zovirax (acyclovir) is a synthetic nucleoside analogue that interferes with the replication of herpes viruses used to treat
  • shingles,
  • chickenpox,
  • and genital herpes.

What is Valtrex?

Valtrex (valacyclovir) is an antiviral medication used to treat infections with:

  • herpes zoster (shingles),
  • herpes simplex genitalis (genital herpes),
  • and herpes labialis (cold sores).

QUESTION

Ringworm is caused by a fungus. See Answer

What Drugs Interact With Zovirax?

Zovirax may interact with probenecid. Tell your doctor all medications and supplements you use.

What Drugs Interact With Valtrex?

Valtrex may interact with digoxin, diuretics (water pills), blood thinners, antifungal medications such as ketoconazole, antibiotics such as ampicillin, iron, or methotrexate, and HIV or AIDS medications such as atazanavir and nelfinavir.

Valtrex may interact with, lithium, methotrexate, pain or arthritis medicines, medicines used to treat ulcerative colitis, medicines used to prevent organ transplant rejection, IV antibiotics, antiviral medicines, or cancer medicines. Tell your doctor all medications and supplements you use.

How Should Zovirax Be Taken?

Zovirax tablets are available in 200, 400 and 800 mg strengths and as a liquid suspension with 200 mg strength per 5 ml. Usual doses are 800 mg every 4 hours, 5 times a day for 10 days for shingles; doses for genital herpes infection are the same interval but start with 200 mg. Doses for chickenpox is the same as shingles except it goes for only 5 days for adults; for children ages 2 and up are weight based (20 mg per Kg) up to 40 Kg, 5 times a day for 5 days. Over 40 Kg, the person gets the adult dose for 5 days.

How Should Valtrex Be Taken?

The dose of Valtrex depends on the condition being treated. Valtrex is taken as caplets that may be taken with or without food.

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References

GSK. Zovirax Medication Guide.
https://www.gsk.com/en-gb/products/our-consumer-healthcare-products/skin-health/zovirax/
FDA. Valtrex Prescribing Information.
https://www.accessdata.fda.gov/drugsatfda_docs/label/2008/020487s014lbl.pdf

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