Buy Zovirax Online for Shingles and Recurring Herpes Flares

Buy Zovirax online — acyclovir capsules and tablets in 200, 400 and 800 mg that shorten a shingles attack and hold herpes back from the cornea. One brand name covers three separate products, and only one of them is swallowed. A cream treats the lip. An ointment treats a first genital outbreak. Tablets reach tissue no tube can. Most searches arrive looking for Zovirax cream. An eye clinic reaches first for Zovirax tablets. The virus that scars a cornea sits deep in a nerve.

Published August 2026 · every dose on this page follows the FDA prescribing information for Zovirax capsules tablets cream and ointment

Which Zovirax Form Matches Which Infection

Three products carry the Zovirax name. The label ties each one to a different infection. A 5% cream treats cold sores on the lip and face, and a 5% ointment treats an initial genital outbreak. Swallowed acyclovir comes as capsules, tablets or a suspension and covers shingles, genital herpes, chickenpox and long-term suppression. Same molecule throughout, three unrelated schedules.

Nothing on the Zovirax list is a cure. Treatment shortens an attack, and it can hold the next one off. No antiviral on the market clears the virus out.

Zovirax is also not an antibiotic. Acyclovir does nothing to bacteria. An infected lid margin or a bacterial eye infection needs something from another shelf, such as doxycycline. Confusing the two wastes the week that matters most.

Some people who buy Zovirax online want a tube for cold sores that flare a few times a year. Others need tablets for something a tube cannot reach, and anyone whose herpes has already involved an eye belongs in that second group. For them the form is not a preference. The choice decides whether the medication arrives where the virus actually sits.

Acyclovir Is the Generic Name Behind Zovirax

Acyclovir is the generic name, and it has carried that role since 1982, when Zovirax reached American pharmacies. The molecule earned Gertrude Elion a share of the 1988 Nobel Prize in Medicine. Before it arrived, herpes treatment barely existed.

British and Irish labels spell the same molecule aciclovir. Both spellings mean identical tablets. A tube bought in Europe holds the same 5% preparation sold here.

The oral brand has left the United States. Zovirax capsules at 200 mg now sit in the discontinued part of the Orange Book. The 400 mg and 800 mg tablets are no longer marketed either. Safety had nothing to do with it, and the FDA said so for the capsules in a 2020 notice. Generic approvals carried on unaffected. Every oral acyclovir dispensed at an American counter today is generic Zovirax.

Brand manufacturing carried the original trials, and the label every copy now follows was written from that work. A generic Zovirax has to prove it delivers the same acyclovir into the blood within a narrow margin. Cost per pill is what varies between suppliers, and across a year-long course small differences add up.

Topical is the exception. Bausch still markets branded Zovirax cream. A branded Zovirax tube costs several times a generic tube of the same 5% acyclovir. Cream is the one form where a buyer genuinely chooses between the two.

How Acyclovir Stops the Virus From Copying

Acyclovir arrives inactive, and the virus has to switch it on. Infected cells carry a viral enzyme called thymidine kinase, which converts the molecule into a usable form. Healthy cells lack it and mostly leave the medication alone. Selectivity of that kind explains the short list of side effects.

Once activated, acyclovir works as a counterfeit building block. The virus grabs it while copying its genetic material, and the chain stops dead at that point.

Resistance appears almost only in people with badly weakened immunity. Strains missing that activating enzyme can survive a course. In everyone else, four decades of use have barely dented how well the molecule works.

Zovirax Dosage and the Five-Times-a-Day Clock

Zovirax dosage depends on the infection, and most schedules ask for five doses a day. Shingles takes 800 mg every four hours while awake, for seven to ten days. An initial genital episode takes 200 mg on that same rhythm for ten days. Suppression is the gentle one at 400 mg twice daily.

Cold sores enter that table only as a cream, and the reason is regulatory. Oral acyclovir holds no American approval for herpes labialis. Prescribers still use tablets for a stubborn lip flare, though the label does not cover it.

American pharmacies stock 200 mg capsules alongside 400 mg and 800 mg tablets. A suspension at 200 mg per 5 mL covers children. MedlinePlus keeps a plain overview of the oral forms. Approved schedules in full sit in the DailyMed prescribing information.

The awkward clock traces back to absorption. Only 10% to 20% of a swallowed dose reaches the bloodstream. What arrives clears fast, with a plasma half-life of 2.5 to 3.3 hours. Blood levels drop away by the fourth hour. Five doses. Four hours apart.

Valacyclovir was built to fix that problem. It absorbs several times better and needs three daily doses instead of five. Over a week of shingles the difference is 21 tablets against 35, which is why Valtrex dominates that prescription. Zovirax answers on price and on a record running a decade longer.

Weak absorption turns useful in one place. Long-term eye protection runs at 400 mg morning and evening. Zovirax tablets at that strength carry both of the eye regimens, and a dose that small is one people can stay on for a full year.

The Window Where Treatment Still Helps

Seventy-two hours from the first shingles blister is the outer limit. Inside that window a course shortens healing and cuts pain. Past it the virus has finished its replication burst, leaving tablets little to interrupt.

Cold sores run a tighter clock. Zovirax cream applied at the tingle beats cream applied later. Cold sores that have already crusted sit past the window, and waiting for certainty spends the only hours that count.

An initial genital episode follows the same 72-hour rule. A recurrence needs treatment at the earliest sign. A late start does not make an outbreak worse. The medication simply works on a process that has mostly finished.

The Dendritic Ulcer That Signals Herpes in the Eye

A dendritic ulcer is herpes simplex keratitis growing on the corneal surface. Fluorescein dye under a slit lamp gives it away, showing a branching line with swollen edges. The pattern resembles a bare tree drawn on the front of the eye. Herpes simplex keratitis remains a leading infectious cause of corneal blindness worldwide, and the dendrite is usually the first visible sign of it.

Symptoms rarely shout virus. One eye reddens and waters. Light turns uncomfortable, vision blurs slightly, and grit seems trapped under the lid. Corneal sensation often drops at the same time, so a dendritic ulcer can hurt less than a simple scratch. Contact lens wearers are told they have an abrasion instead.

Depth decides treatment, and keratitis sits at three levels:

• Epithelial keratitis — the surface ulcer, the classic dendrite, and the layer antivirals clear well
• Stromal keratitis — inflammation deeper in the corneal body, where scarring starts and sight is genuinely at risk
• Endothelial keratitis — swelling of the innermost layer, which clouds the whole cornea until it settles

Oral treatment has a defined place in epithelial keratitis. The American Academy of Ophthalmology treatment guideline accepts oral acyclovir as an alternative to topical antivirals. The dose is 400 mg five times daily, roughly 2 grams. Zovirax tablets do that work rather than any tube. Swallowed treatment also leaves the corneal surface alone, while topical antivirals irritate the tissue trying to heal.

Stromal keratitis reverses that logic. Inflammation does the damage there rather than the virus itself. A steroid becomes necessary, and prednisolone acetate drops are the standard choice, but a steroid used alone would hand the virus a free run. An antiviral runs underneath it as cover.

Recurrence is the defining feature of ocular herpes. Between attacks the virus retreats into the trigeminal ganglion and waits. Ultraviolet light, fever, physical stress and eye surgery all wake it up again. Each fresh episode of stromal keratitis leaves a little more scar. Scars in the visual axis are what cost sight. Long-term suppression exists to interrupt that cycle.

Buy Zovirax Online and What a Course Costs

Zovirax cost depends entirely on the form. Tablets are cheap and Zovirax cream is not. Generic acyclovir tablets rank among the least expensive antivirals in American pharmacy. Brand cream runs from roughly $200 to nearly $600 for one 5 gram tube, depending on the counter. A tube covering four days can cost more than a year of tablets.

Count the course before you buy Zovirax online. A ten-day shingles regimen needs 50 tablets of the 800 mg strength. A small box runs dry mid-treatment. Suppression at two 400 mg tablets a day works out at 730 across a year. A bulk pack moves that total by hundreds of dollars.

Cold sores need almost nothing by comparison. Five applications daily for four days use only a fraction of a tube, so most people finish a whole flare on one 5 gram pack. Anyone with two or three cold sores a year needs a tube rather than a box of tablets.

Coupon sites crowd the Zovirax price searches and mislead more than they help. A retail savings card discounts a prescription filled at one chain and has no bearing on a pack ordered elsewhere. Medicare formularies cover generic acyclovir tablets widely, which again describes a counter rather than a mail order.

Two things keep Zovirax cream expensive. A stable 5% topical preparation is harder to make than a pressed tablet, and the brand tube never met the flood of competitors that drove oral prices to pennies. Buy Zovirax online in tablet form and the saving is plain. Buy the cream and the comparison runs against a retail tube priced in the hundreds.

Is Zovirax Sold Over the Counter in the US

No, and Zovirax cream is no exception. Every acyclovir preparation here is prescription-only, including the 5% tube people expect to find beside the lip balms. A US pharmacy will ask for a valid prescription before dispatching any form, and cold sore buyers meet that rule as often as anyone. Several countries do sell acyclovir cream over the counter, which is where much of the confusion starts.

One antiviral does sit on the open American shelf. Docosanol, sold as Abreva, is the only cold sore treatment approved over the counter here, and it blocks the virus from entering skin cells rather than stopping it copying. Penciclovir cream, sold as Denavir, stays prescription-only like acyclovir. Patches and medicated lip balms fill the rest of that shelf. Neither touches the virus.

Three practical reasons sit behind the rule:

• Kidney function changes the correct dose, sometimes sharply
• A cold sore on a lip and keratitis on a cornea come from the same virus and need entirely different handling
• Resistance builds faster with casual, repeated, half-finished courses

Getting the prescription is now the easy part. Licensed prescribers work through telehealth services in most states, and an assessment for recurrent cold sores takes minutes. A Zovirax script then works at any pharmacy or with a mail-order seller. The online route does not remove the prescription, only the place where the conversation happens. Sellers advertising acyclovir over the counter work outside that system.

A decision to buy Zovirax online is legitimate, and a few signs separate a serious seller from the rest. A prescription is requested before dispatch rather than after payment. Tablet strength and pack quantity appear before checkout. The active ingredient is printed next to the brand name on every listing. A physical address and a named licensed pharmacist are published. Someone answers a direct question about the form being shipped.

A seller happy to skip the prescription skips the kidney question too. With acyclovir that question sets both the dose and the interval. Searches for Zovirax over the counter run steadily every month because a cold sore feels like an ordinary problem. The rules themselves have not moved.

What Acyclovir Cream Does to a Cold Sore

About half a day. Zovirax cold sore cream is what most people mean when they type the brand name, and that is the honest measure of what it buys. The figure comes from the manufacturer’s own trials, not from reviews. Two randomized studies put 682 people on acyclovir cream against 703 on the vehicle alone. Cold sore episodes lasted roughly 4.5 days against 5. Neither trial found any difference in whether a lesion progressed at all.

Half a day sounds thin until the alternatives are counted. Nothing applied to skin performs much better, and the effort costs almost nothing. Expectations go wrong here more often than the medication does.

Application follows the label closely. A thin layer covers the sore and the skin around it, five times a day, for four days. The first dose should land as early in the flare as possible. Approval covers ages 12 and up. Full details sit in the DailyMed label for Zovirax cream.

Cold sore packs differ by country, so tube sizes cause more confusion than the schedule. Searches turn up sizes never sold here:

• 5 gram tube — the American cream pack, and the only size currently supplied
• 0.9 gram tube — a smaller cream pack discontinued back in 2015
• 2 gram tube — a European cold sore pack, which is why it appears in searches but not on US listings
• 30 gram tube — the ointment, a different product for a different infection entirely

Combination tubes exist as well. Xerese pairs the same 5% acyclovir with 1% hydrocortisone to calm inflammation alongside the virus, and it is approved from age 6. European pharmacies sell that combination as Zovirax Duo. The name turns up in American searches and leads nowhere useful.

Zovirax cream does not prevent the next cold sore, because the virus lives in a nerve the cream never reaches. It does not lower the chance of passing the virus to someone else either. And it has no role in a genital outbreak, where Zovirax ointment holds that indication instead. Anyone flaring monthly is asking a suppression question, and the answer to that one comes in tablets.

Tolerance is unremarkable. Application site reactions appeared in 5% of cream users against 4% on the vehicle. Repeat insult patch testing found possible sensitization in the same 2% of subjects on both the cream and the vehicle. Individual complaints each stayed under 1%.

No Acyclovir Eye Ointment Reaches US Shelves

A 3% ophthalmic ointment has been approved across much of the world for decades. American approval never followed, and no US pharmacy has ever carried one. Anyone searching for Zovirax eye ointment wants a product that cannot be filled here.

Britain lost it too. The manufacturer told prescribers in December 2018 that Zovirax eye ointment would go. Supply had become impossible to guarantee. Stock was expected to last until the middle of 2019. Imported 3% ointment still circulates in some countries as an unlicensed medicine.

American ophthalmology moved to ganciclovir 0.15% ophthalmic gel, sold as Zirgan and approved in September 2009 for acute herpetic keratitis. It goes in five times daily until the ulcer heals. Three doses a day then follow for a week. Zirgan was the first new ophthalmic antiviral here in nearly thirty years. Trials put it level with 3% acyclovir ointment, with less blurring and less surface irritation. Trifluridine drops remain on the market and demand nine doses a day, which is part of why they fell out of favor.

A foreign tube in hand raises a separate question. Pharmacists here cannot dispense against a label carrying no US approval. An imported tube also sits outside any supply chain a pharmacy can verify. Travelers do arrive holding one. The practical answer is usually an oral course plus the approved gel. A prescriber can write both today.

Tablets fill the gap. Oral acyclovir travels through the bloodstream into the cornea and the nerve behind it. No gel reaches that far. Herpetic keratitis is therefore managed with tablets here, while other markets reach for a tube.

One Tablet Twice a Day Keeps Herpes Off the Cornea

Twelve months of acyclovir at 400 mg twice daily cuts the odds of ocular herpes returning. The Herpetic Eye Disease Study randomized 703 people who had ocular herpes within the previous year. Results appeared in the New England Journal of Medicine in 1998 and have shaped practice since.

Halving stromal keratitis is the finding that matters most. Among people who had already had it, 14% relapsed on acyclovir against 28% on placebo. Surface ulcers heal cleanly, while stromal scars accumulate.

Recurrence did not rebound in the six months after treatment stopped, so a year of tablets was not simply postponing trouble. Two tablets a day is also a light enough commitment that people finish twelve months. The five-dose treatment schedule would never survive that long.

Shingles raises its own version of this question. Varicella zoster reaches the eye by a different route and was studied separately with valacyclovir. That trial and its regimen sit on the Valtrex page.

Corneal Grafts Need Acyclovir Cover for Months

Herpes scarring is a common reason for a corneal transplant. The virus does not leave once the graft is in place. Standard practice keeps Zovirax running for months afterward, at the same dose used for suppression.

A placebo-controlled multicenter trial followed 68 grafted eyes. Treatment ran at 400 mg twice daily for six months. Across two years it counted three culture-proven recurrences on treatment against nine on placebo. That trial remains the reference for post-transplant cover.

Corneal surgery is exactly the stress that reactivates a latent virus. Every graft patient also runs weeks or months of steroid drops to prevent rejection. Steroids suppress the local immune response that keeps herpes dormant. Antiviral cover is what lets the steroid do its job without waking anything up.

Cataract surgery and laser vision correction follow the same principle on a shorter timescale. A herpetic history is what triggers the cover. Skipping the antiviral invites keratitis in the week an eye can least afford it.

Side Effects and How Often They Actually Happen

Most people finish a Zovirax course having noticed nothing. Label figures come from the original trials and stay modest. Among 323 people on 800 mg five times daily for shingles, malaise led at 11.5%, barely above the 11.1% on placebo. A ten-day genital course at 200 mg produced nausea or vomiting in 2.7% of 298 participants. Across a year of suppression, 586 people reported nausea at 4.8% and diarrhea at 2.4%.

The rare problems are the serious ones. Renal failure has been reported with this treatment and has occasionally been fatal. Thrombotic thrombocytopenic purpura and hemolytic uremic syndrome have occurred in people with severely weakened immunity, sometimes fatally. Neurological reactions form the third group and are covered below.

Lifetime animal studies found no rise in tumors, and the recurring worry about cancer risk has nothing behind it.

Interactions are few, and two matter. Probenecid slows acyclovir out of the body, lifting blood levels and stretching the half-life. Anything else hard on the kidneys stacks with the same risk. The label asks for caution alongside nephrotoxic medications. Mycophenolate, used after transplants, belongs in that group. Ordinary painkillers, antihistamines and blood pressure tablets do not.

Alcohol has no listed interaction with acyclovir. Liver pathways barely overlap, and a glass of wine will not stop a course working. Fluid balance on a full shingles regimen is the real conflict, since four grams a day pass through the kidneys. That load, not any direct clash with alcohol, is the reason to go easy during a treatment week.

Why Dehydration Turns Acyclovir Into Crystals

The molecule dissolves poorly and leaves the body almost entirely through the kidneys. Concentrated urine lets it crystallize inside the kidney tubules and block them physically. A routine antiviral course can end in acute kidney injury for exactly that reason. Fluid intake here is a dosing instruction rather than general advice, and it matters most on the 800 mg schedule.

Reduced filtration changes the interval rather than the tablet. The label sets out the adjustments:

• Creatinine clearance 10 to 25 on the shingles dose — 800 mg every 8 hours instead of every 4
• Clearance under 10 on the shingles dose — 800 mg every 12 hours
• Clearance under 10 on any 200 mg or 400 mg schedule — 200 mg every 12 hours

Nervous system effects follow the same accumulation. Somnolence, hallucinations, confusion and, in severe cases, coma have all been reported. They appear more often in older patients, whose filtration has usually declined with age. Symptoms reverse once levels come down. Recognizing the cause is the hard part. Confusion in an eighty-year-old rarely gets blamed on an antiviral.

Acyclovir in Pregnancy and While Breastfeeding

Acyclovir has one of the longer pregnancy records among antivirals. A registry running from 1984 to 1999 followed 749 pregnancies with first-trimester exposure and recorded 756 outcomes. Birth defect rates tracked the general population. The label adds its own caveat, because the registry was too small to settle the question outright.

Breastfeeding raises less concern. Acyclovir does enter milk, at concentrations above those in the mother’s blood. The amount reaching an infant still works out far below any treatment dose. Topical use narrows the question further. A thin layer of 5% cream on a lip delivers very little into the blood.

Disclaimer

This page provides general information about a prescription medication and does not replace individual medical advice. Talk to your doctor or pharmacist before starting or changing any antiviral course. That matters most with an eye. A red painful eye needs examination rather than a tube from a cupboard. Other entries in our medication library cover the steroids and antibiotics prescribed alongside an antiviral.