Valaros 500mg Tablet 3s, also known as valaciclovir, is an antiviral medicine. It is taken by mouth as a tablet and comes in 500 mg and 1 g strengths. It treats infections caused by herpes viruses. These include cold sores on the lips, genital herpes, shingles (herpes zoster) in adults, and chickenpox in children aged 2 years and older. Inside the body, Valaros 500mg Tablet 3s changes into aciclovir (also spelled acyclovir), which is the part that fights the virus. It stops the virus from spreading. It can shorten an outbreak and ease symptoms. Taken daily, it can help prevent repeat outbreaks of genital herpes. Valaros 500mg Tablet 3s does not remove the virus from your body, so outbreaks can come back later. It works best when started soon after symptoms begin.
Written by: Shubham Kumar Singh, B pharmacy
Reviewed by: Dr. Jay Faldu, MBBS
Last updated on: 29-10-2026
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Valaros 500mg Tablet 3s, also known as valaciclovir, is an antiviral medicine. It is taken by mouth as a tablet and comes in 500 mg and 1 g strengths. It treats infections caused by herpes viruses. These include cold sores on the lips, genital herpes, shingles (herpes zoster) in adults, and chickenpox in children aged 2 years and older. Inside the body, Valaros 500mg Tablet 3s changes into aciclovir (also spelled acyclovir), which is the part that fights the virus. It stops the virus from spreading. It can shorten an outbreak and ease symptoms. Taken daily, it can help prevent repeat outbreaks of genital herpes. Valaros 500mg Tablet 3s does not remove the virus from your body, so outbreaks can come back later. It works best when started soon after symptoms begin.
Valaros 500mg Tablet 3s belongs to a group of medicines called antivirals. It is a "prodrug", which means it is an inactive form that the body turns into the active medicine. After you swallow the tablet, Valaros 500mg Tablet 3s is absorbed from the gut quickly. It is then converted almost completely into aciclovir and L-valine, a natural amino acid. This happens mainly in the gut wall and the liver. Taking aciclovir in this form gets more medicine into the blood than aciclovir tablets do, so Valaros 500mg Tablet 3s usually needs fewer doses a day.
Inside cells infected with herpes, aciclovir blocks the enzyme the virus uses to copy its genetic material. The virus then cannot multiply and spread to nearby cells. Your immune system can then control the outbreak, and sores may heal sooner.
Doctors prescribe Valaros 500mg Tablet 3s for:
Valaros 500mg Tablet 3s acts on the herpes virus only while you take it. Once you have the herpes virus, it stays in your body, resting in nearby nerves. That is why outbreaks can come back after you stop the medicine. For cold sores, treatment works best when started at the first sign, such as tingling, itching or burning.
Valaros 500mg Tablet 3s leaves the body mainly through the kidneys, so kidney health matters with this medicine. Some people have a higher chance of kidney problems: older adults, people with kidney disease, people who do not drink enough fluids, and people taking other medicines that can harm the kidneys. Some of these people can also develop confusion or other nervous system effects. Your doctor may change the dose based on how well your kidneys work. Use Valaros 500mg Tablet 3s only under medical supervision. Before you start, tell your doctor about any kidney disease, immune system problems or HIV infection, or if you have had a bone marrow or kidney transplant.
Common Side Effects (Usually Mild)
Serious Side Effects (Seek Urgent Medical Attention)
If you get a painful rash with sores in the mouth, eyes or genitals, or a rash that keeps spreading, stop Valaros 500mg Tablet 3s and get medical help right away.
Valaros 500mg Tablet 3s is a "prodrug" of aciclovir. It is aciclovir joined to L-valine, an amino acid. This link helps the medicine pass from the gut into the blood. Once absorbed, the body quickly removes the valine and releases aciclovir, the active antiviral.
Herpes viruses have to copy their DNA (their genetic instructions) to multiply. Aciclovir looks very similar to one of the natural building blocks of DNA. Here is how it works, step by step:
With its DNA copying blocked, the virus cannot make new copies of itself. This limits the outbreak and lets the immune system take over. Valaros 500mg Tablet 3s acts on herpes simplex virus types 1 and 2, which cause cold sores and genital herpes. It also acts on varicella-zoster virus, which causes chickenpox and shingles.
The prescribing information does not list any clinically significant interactions between Valaros 500mg Tablet 3s and other medicines. A few points still matter:
Your doctor decides the dose and how long you take it, based on your condition, age and kidney function. The usual adult doses on the approved label are:
Valaros 500mg Tablet 3s is taken no more than three times in 24 hours, depending on the condition. People with kidney problems often need a lower dose. Do not change your dose or the length of treatment on your own.
Taking too much Valaros 500mg Tablet 3s can cause aciclovir to form crystals in the kidneys. This can lead to sudden kidney failure, sometimes with little or no urine. Too much of the medicine can also cause nervous system effects, such as agitation, confusion, hallucinations, seizures or coma. Older adults and people with kidney disease are at higher risk.
If you think someone has taken too much, contact a doctor or go to the nearest emergency department right away. Call emergency services if the person has collapsed, had a seizure, has trouble breathing or cannot be woken up. In hospital, doctors may use haemodialysis (a machine that filters the blood) to remove the medicine until the kidneys recover.
Get medical help right away if you notice:
Therapeutic Class
Antiviral (anti-herpes)
Action Class
Viral DNA polymerase inhibitor (prodrug of aciclovir)
Chemical Class
Acyclic guanosine (purine nucleoside) analogue - L-valyl ester prodrug of aciclovir
Habit Forming
No
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