Xorox

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Xorox

Property Description
Active Ingredient Aciclovir (Acyclovir)
Pharmacological Class Antiviral Agent / Synthetic Nucleoside Analogue
Origin Synthetic
Available Forms Oral, Topical (Cream/Ointment, Ophthalmic), Intravenous
General Purpose Management of infections caused by Herpes-group viruses

What Type of Medicine is Xorox?

Xorox is a prescription-only pharmaceutical preparation whose active substance, Aciclovir (also known as Acyclovir), is classified as a potent antiviral agent. This medicine belongs specifically to the synthetic nucleoside analogue class, a category clinically recognized for its targeted effect against certain viral replication processes. The importance of Aciclovir is evidenced by its inclusion on the Model List of Essential Medicines since 1997.

Composition and Available Forms

The core composition of Xorox relies on the single active substance, Aciclovir (INN); it is not a combination product. This small molecule is compounded into various pharmaceutical preparations to suit different clinical needs, providing therapeutic flexibility that is supported by extensive manufacturing standards. Forms include oral dosage forms, injectable solutions for hospital use, and topical preparations, with its ophthalmic ointment being a key differentiator for the topical ophthalmic route of administration. Aciclovir is used to treat infections caused by the herpes family of viruses.

General Purpose and Mechanism Principle

The general purpose of Xorox is the management of infections caused by susceptible pathogens, primarily Herpes Simplex Virus (HSV) and Varicella-Zoster Virus (VZV). The high-level principle is one of selective toxicity, a mechanism that has been verified through decades of research to ensure targeted action. The drug effectively acts as a DNA chain terminator, blocking the synthesis of viral DNA without significantly disrupting healthy cells. By limiting the virus's ability to multiply, the medication helps to curb the spread of the pathogen, which is crucial for reducing the severity of the infection.

Regulatory References

  1. WHO Essential Medicines Lists
  2. Aciclovir on WHO eEML
  3. About MedlinePlus - NLM
  4. Acyclovir: MedlinePlus Drug Information

What side effects are possible with Xorox?

Possible Side Effects and Safety Information

The safety profile for Xorox (Aciclovir) is formally documented in regulatory texts and is primarily organized by the frequency and physiological system affected.

Frequency-Classified Adverse Reactions

The regulatory safety profile classifies known reactions into several categories:

  • Common Reactions (occurring in 1/100 and < 1/10 patients): These often involve the Gastrointestinal and Nervous Systems, manifesting as headache, dizziness, nausea, vomiting, diarrhoea, abdominal pains, as well as pruritus and rashes (including photosensitivity).
  • Uncommon Reactions: These include urticaria and accelerated diffuse hair loss.
  • Rare and Very Rare Events: These categories encompass less frequent but more serious adverse reactions that affect major organ systems.

Serious and Systemic Safety Considerations

Adverse effects are also tracked according to the official System-Organ Classes (SOC), highlighting risks associated with the drug's elimination and impact on the nervous system.

  • Renal and Urinary System: Rare increases in blood urea and creatinine are noted. Very rare events include acute renal failure and renal pain.
  • Psychiatric and Nervous System: Very rare, serious events documented include encephalopathy, confusion, convulsions, tremor, and coma. These neurological effects are generally reversible upon discontinuation of the medicine.
  • Other Serious Events: Regulatory information lists anaphylaxis (Rare) and hepatitis and jaundice (Very Rare) as possible outcomes.

Population-Specific Safety Notes

Official labeling includes explicit safety considerations for certain patient groups:

  • Older Adults and Patients with Renal Impairment: Due to the drug's dependence on renal clearance, these patients are documented as having an increased risk of developing neurological side effects. Maintaining adequate hydration is a documented requirement for patients receiving high doses to mitigate renal risk.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory documentation for Xorox (Aciclovir) strictly defines the symptoms and required emergency actions following an overdose. Any suspected overdose necessitates immediate medical attention.

Documented Overdose Manifestations

Administration Route Documented Manifestations
Oral Overdose Gastrointestinal effects (nausea, vomiting, diarrhea) and neurological symptoms (headache, confusion).
Intravenous (IV) Overdose Severe renal complications (elevated serum creatinine, blood urea nitrogen, acute renal failure) and profound CNS effects (hallucinations, seizures, coma).

Officially Required Emergency Actions

Immediate medical help must be sought if an overdose is suspected, as certain manifestations may be life-threatening. The official labeling mandates that individuals contact emergency services or a poison control center immediately.

Management is strictly symptomatic and supportive. Regulatory documents state that no specific antidote is known for Aciclovir overdose. However, Aciclovir is described as dialyzable, meaning hemodialysis is an officially described procedural measure to remove the drug from the bloodstream, particularly in severe cases.

Population-Specific Risk

Patients with pre-existing renal impairment are officially noted to be at a higher risk for developing severe neurological side effects following an overdose due to reduced drug clearance. Hospital monitoring is required for assessment and management of acute renal failure and neurotoxicity.

Therapeutic Uses of Xorox

What Xorox treats: main uses and benefits

Xorox is commonly used across conditions presenting with acute episodes and recurrent manifestations of Herpes-group viruses, including Shingles (Herpes Zoster), Chickenpox (Varicella), Genital Herpes, and Cold Sores. The medication is applied in scenarios where additional management of discomfort is required to cope with acute symptoms, and it helps address symptom clusters such as the localized burning, tingling, and pronounced pain associated with the rash. It may be part of symptomatic management to help ease discomfort.

In addition to treating acute discomfort, it is relevant when supportive symptom management is appropriate for long-term stabilization, may be part of symptomatic management in situations involving recurrent or episodic manifestations. The therapy plays a role in managing the overall symptom load and may assist with maintaining a sense of stability when symptoms are more noticeable.

“The therapy plays a role in managing the overall symptom load and may assist with maintaining a sense of stability when symptoms are more noticeable.”

Quick Fact: Supportive Relief for Viral Lesions and Acute Pain

Regulatory References

  1. NIH MedlinePlus Drug Information overview

Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Xorox — Official Regulatory Information

The eligibility profile for Xorox (Aciclovir) is defined by official regulatory bodies, primarily through mandated contraindications and conditional use requirements.


Populations for Whom Use is Prohibited or Restricted

Classification Regulatory Status
Absolute Contraindication Patients with a known hypersensitivity to Aciclovir, Valaciclovir, or any component of the formulation must not use this medicine.
Age-Related Restriction For certain oral and topical forms, safety and effectiveness have not been fully established in children younger than 2 years of age.
Organ Function Restriction Use is conditional: a dosage adjustment is required for patients with impaired renal function due to the drug's elimination pathway. Geriatric patients must also be assessed for likely age-related renal decline.
Reproductive Status Pregnancy use is conditional and is generally permitted only if the potential benefit justifies the potential unknown risk. Caution is advised when administering to a nursing mother, as the drug is excreted into breast milk.
Comorbidity Restriction Specific oral forms are contraindicated in patients with rare hereditary metabolic conditions (e.g., Lapp lactase deficiency) and caution is advised in patients with underlying neurological abnormalities.

The regulatory criteria define eligibility based on the absence of hypersensitivity and the status of organ function, while imposing conditional use rules for specific age and reproductive populations.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile of Xorox (Aciclovir) is defined by pharmacokinetic and pharmacodynamic relationships documented in official drug labeling.

Interaction Classifications

The medicine is formally contraindicated for patients with a known history of hypersensitivity to either Aciclovir or its related prodrug, Valaciclovir. Other documented interactions are classified as use-with-caution combinations, largely based on two main regulatory concerns:

1. Transporter-Mediated Exposure Increase

The co-administration of Xorox with certain medicinal products that reduce its clearance may increase Aciclovir plasma exposure (AUC and half-life). This is due to competitive inhibition of renal tubular secretion, the primary method of Aciclovir elimination. Specific interacting medicines documented to cause this effect include Probenecid and Cimetidine. The combination of such products can lead to a formal reduction in Aciclovir’s renal clearance as stated in regulatory documents.

2. Additive Organ Toxicity

Caution is formally required when co-administering Xorox with other potentially nephrotoxic agents, as this combination is documented to increase the risk of renal dysfunction. For oral forms, the regulatory profile notes that the medicine may be taken with or without food, indicating that food does not create a clinically significant restriction or timing requirement.

Mechanism of Action

Selective Activation by Pathogen-Specific Enzymes

The core mechanism of Xorox (Aciclovir) is its reliance on Viral Thymidine Kinase (vTK), an enzyme present only in cells actively infected by the target pathogen. This enzyme selectively recognizes and converts the inactive drug into its first active form. This initial step establishes the mechanism's selective nature, limiting its activity primarily to cells expressing Viral Thymidine Kinase.


Irreversible Arrest of Viral DNA Synthesis

Once activated, the drug is further processed into its triphosphate form, which acts as a false building block for the viral genome. It is incorporated into the nascent Viral DNA strand by Viral DNA Polymerase, but because the molecule lacks the chemical group necessary for further chain growth, it immediately causes the replication process to terminate. This definitive arrest of the viral genome synthesis pathway results in the termination of new viral genome production, contributing to a reduced viral load.


Mechanistic Constraint of Viral Latency

The efficacy of this mechanism is fundamentally constrained by the virus's biological state. Because the activating enzyme (vTK) is only expressed when the virus is actively replicating (lytic phase), the drug is functionally inert against viral DNA that is in the quiescent latent phase within nerve cells. This specificity defines the constraints of the mechanism, which is functionally inactive against the non-replicating viral DNA found in latent reservoirs.

Dosage and Administration Information

Xorox (Aciclovir) is administered via Oral, Intravenous (IV) Infusion, or Topical routes, depending on the required systemic or local effect. The usage instructions are highly structured according to the regimen type and the patient's renal function.

Official Administration and Dosing Principles

Administration Route Standard Adult Dosing Pattern Treatment Duration Pattern
Oral (Tablets/Capsules) Acute treatment: Generally 200 mg to 800 mg per dose, typically taken five times daily (approximately every four hours while awake). Acute courses typically last 5 to 10 days. Suppressive therapy may continue for up to 12 months.
Intravenous (IV) 5 mg/kg to 10 mg/kg body weight, administered every 8 hours. Typically prescribed for 5 to 10 days or longer for severe infections.
Topical (Cream/Ointment) Applied externally five times a day. Used for a short course, often 4 to 10 days.

Special Instructions and Conditions of Use

Dose Adjustment: Clinical protocols involve a reduction in dosage or dosing interval for patients with renal impairment (reduced kidney function). This adjustment is calculated based on the patient's creatinine clearance (Cl cr). Older adults may also require dosage modification due to common age-related decline in renal function.

IV Administration: Intravenous infusion must be performed slowly, over a period of at least one hour, and adequate hydration must be maintained throughout the infusion period. The IV solution requires dilution prior to administration and must not be given as a rapid bolus injection.

Oral Intake: Oral forms, such as tablets and suspension, may be taken with or without food. If a dose is missed, patients should take it as soon as they remember, unless it is almost time for the next scheduled dose, in which case the missed dose should be skipped.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Xorox

This section provides a patient-friendly summary of the clinical research that has explored the role of Xorox (Aciclovir), detailing the types of studies conducted and the specific outcomes that researchers investigated, strictly based on official regulatory and peer-reviewed scientific sources.


Evidence for Treating Acute Shingles (Herpes Zoster) Episodes

The research for Xorox in treating shingles is primarily sourced from Randomized Controlled Trials (RCTs) and subsequent large-scale analyses. Studies monitored the time required for the lesions to progress toward healing and assessed changes in the duration and intensity of acute pain episodes. Most studies focused on immunocompetent adults, particularly those 50 years of age or older. Data show patterns related to the prevalence of long-term nerve pain, known as Postherpetic Neuralgia (PHN); however, findings were mixed across different scientific reviews regarding this long-term outcome. The results apply only to the populations studied, and research explored outcomes associated with varied treatment commencement times.

Evidence for Managing Genital Herpes

The core clinical research covers trials focused on the acute treatment phase or trials focused on a defined duration of suppressive therapy. For acute episodes, RCTs monitored the time to complete lesion healing and the duration of viral shedding. For recurrence prevention, long-term observational studies and RCTs tracked the frequency and severity of recurrent episodes in immunocompetent and immunocompromised patients. The evidence focuses on short-term changes; the medication was studied for managing the acute outbreak, not for eliminating the latent virus. Limited information is available for long-term outcomes regarding recurrence rates following defined periods of continuous therapy.


What is Still Uncertain About Xorox

The research evidence highlights areas where certainty remains low or where additional studies are needed. Comparative evidence is lacking when trying to precisely evaluate Xorox against some of the newer antiviral agents for outcomes like chronic pain reduction. Data for certain groups remain insufficient, particularly for use in life-threatening systemic infections, which often rely on smaller-scale studies. Follow-up durations were limited in many acute studies, meaning the evidence contributes to understanding symptom patterns but provides limited insight into long-term functional status.

Key Studies & References

  1. Aciclovir: NIH MedlinePlus Drug Information
  2. Antivirals for preventing the recurrence of genital herpes

Frequently Asked Questions (FAQ)

Common questions about Xorox (FAQ)


Q: What is the active ingredient in Xorox?

A: The active pharmaceutical ingredient in Xorox is Aciclovir, which is also known as Acyclovir. Official regulatory information classifies this substance as an antiviral agent. It belongs to the synthetic nucleoside analogue class of medicines.


Q: What is the main ingredient that makes Xorox different from its competitors?

A: The unique characteristic of the active ingredient is its selective mechanism of action. It requires an enzyme found primarily in infected cells, called Viral Thymidine Kinase, to become active. This targeted activation limits the drug's effect mainly to cells actively replicating the virus.


Q: Are there different forms (tablet, liquid, injection) of Xorox available?

A: Yes, Xorox is available in multiple pharmaceutical forms to suit various clinical needs. These include oral dosage forms (such as tablets or suspension), topical creams or ointments for external application, and injectable solutions for intravenous use in a hospital setting.


Q: Is Xorox considered a long-term or short-term treatment?

A: Xorox is used for both short-term acute courses and long-term suppressive therapy, depending on the condition being managed. Acute treatment typically lasts between 5 to 10 days. Suppressive therapy, used to help prevent recurrent outbreaks, may continue for a longer period, up to 12 months, as described in official documents.


Q: What is a summary of the clinical trials that led to Xorox's approval?

A: Clinical research has demonstrated outcomes related to the reduction of viral shedding and the acceleration of lesion healing in acute episodes. Additionally, studies focusing on suppressive therapy showed a reduction in the frequency of recurrent episodes. This evidence supported the medicine's role in managing specific viral infections.


Q: How quickly do people typically start to notice the intended effects of Xorox?

A: Clinical research on acute herpes outbreaks reports a slight acceleration in healing time, with the duration of episodes being approximately one-half day shorter when compared to a placebo in some studies. The medicine is primarily used to limit the virus's ability to multiply, thereby curbing the spread of the infection.


Q: Is Xorox effective for all types of [Treated Condition]?

A: Xorox is described as effective for the management of infections caused by susceptible pathogens, primarily Herpes Simplex Virus (HSV) and Varicella-Zoster Virus (VZV). The drug's mechanism relies on the virus being in an actively replicating state. Its efficacy is fundamentally constrained by the virus's biological state and it is inactive against the latent (non-replicating) virus.


Q: What have the long-term studies on Xorox shown?

A: Regulatory sources and long-term studies have examined the continued use of the medicine and reported findings regarding its tolerability and effectiveness for patients receiving suppressive therapy over defined long-term periods (e.g., up to 12 months).


Q: How long does Xorox stay in the body after the last use?

A: The time it takes for the medicine's concentration to decrease by half is known as the elimination half-life. For Xorox, this half-life is reported in the prescribing information as approximately 2.5 hours in adults with normal kidney function.


Q: Does Xorox need to be taken at the same time every day?

A: The standard acute oral regimen is administered multiple times per day (for example, five times daily) to maintain adequate levels, and official documents advise taking a missed dose as soon as it is remembered.


Q: What are the most commonly reported side effects of Xorox?

A: Official documents list common side effects that occur in a defined percentage of patients in clinical trials. These often involve the gastrointestinal and nervous systems, manifesting as nausea, vomiting, diarrhea, abdominal pains, and headache.


Q: What is the chance of experiencing a rare side effect mentioned in the documentation?

A: Side effects are officially categorized by their frequency in studied populations. A Rare side effect occurs in fewer than 1 in 1,000 patients but more than 1 in 10,000 patients. A Very Rare side effect, which includes the most serious events, occurs in fewer than 1 in 10,000 patients.


Q: Can taking Xorox affect my sleep schedule?

A: The safety profile includes reports of sleepiness, or drowsiness, as a mild side effect. Conversely, some people have reported difficulty sleeping. More serious, but very rare, neurological effects such as confusion and lethargy are also documented.


Q: Is there a link between Xorox and changes in mood or anxiety?

A: The safety profile includes reports of mood changes, such as agitation and confusion. Very rare psychiatric events, including psychotic symptoms or depression, have also been documented. These neurological effects are generally noted as reversible upon discontinuation of the medicine.


Q: What should I do if a non-serious, but bothersome, side effect occurs while using Xorox?

A: Official guidance notes that continuing treatment may be appropriate unless a severe, serious, or allergic reaction occurs. For bothersome but non-serious effects, regulatory summaries advise discussing symptoms with a healthcare professional before making any changes to the treatment.


Q: Can Xorox affect my ability to drive or operate machinery?

A: Official regulatory information states that reactions affecting the nervous system may occur. These can include confusion, hallucinations, tremor, or drowsiness. Regulatory documents indicate that these reactions could potentially affect the ability to drive or operate machinery safely.


Q: Are there any known visual side effects associated with Xorox?

A: The regulatory safety profile notes very rare and serious events involving the eyes, including vision changes or eye inflammation. These serious events are tracked according to official reporting standards.


Q: Can Xorox affect the results of common laboratory blood tests?

A: Regulatory safety profiles note rare events of changes in laboratory test results. These changes include reports of abnormal liver function blood tests and, very rarely, a decrease in the white cell count.


Q: Is Xorox known to be habit-forming or lead to dependence?

A: Regulatory summaries state that Xorox is not known to be habit-forming or addictive, and there are generally no withdrawal symptoms reported when the medicine is stopped.


Q: What are the typical discontinuation symptoms reported after stopping Xorox?

A: Official documents and regulatory summaries indicate that there are no known withdrawal symptoms or typical discontinuation syndrome reported when the medicine is stopped.


Q: What happens if I miss a scheduled dose of Xorox?

A: Regulatory information for the oral form contains guidance for a missed dose. The prescribing information instructs that a missed dose should be taken as soon as it is remembered, but if it is nearly time for the subsequent scheduled dose, the prior dose should be skipped.


Q: Are there any known food or drink restrictions while taking Xorox?

A: Official information states that oral forms of Xorox may be taken with or without food. Regulatory documents do not contain widely documented clinical restrictions regarding food or drink consumption with this medicine.


Q: Does Xorox interact with herbal supplements like St. John's Wort?

A: Official advice generally indicates that there is generally not enough information to definitively state the compatibility of herbal remedies or supplements with Xorox. This is because they are not studied or tested in the same way as prescription medicines.


Q: Does Xorox interact with common contraceptives?

A: Regulatory documents typically do not contain a warning regarding an interaction between Xorox and common combined oral contraceptives, such as those containing ethinyl estradiol and norethindrone. Questions regarding specific contraceptive use should be directed to a healthcare professional.


Q: Is there a known 'wear-off' effect or reduced response over time with Xorox?

A: Regulatory warnings note that prolonged use in severely immune-compromised individuals may lead to the selection of virus strains with reduced sensitivity. This means that the drug may not respond as expected to continued treatment in that specific population.


Q: Is Xorox safe for use in children or older adults?

A: Safety and effectiveness for certain forms are not fully established in children younger than 2 years of age. For older adults, the official guidance notes a need to consider dose reduction due to the common age-related decline in kidney function, as the drug is eliminated primarily through the kidneys.


Q: Are there any special considerations for people with kidney or liver problems who use Xorox?

A: A dosage reduction is formally required for patients with impaired kidney function due to the drug’s elimination route. While not a restriction, rare and very rare events involving the liver, such as hepatitis or jaundice, are also documented in the safety profile.


Q: Does Xorox require any special monitoring or regular doctor visits?

A: Official documentation notes that patients, particularly the elderly or those with kidney impairment, require close monitoring for evidence of neurological side effects. Monitoring of kidney function may also be required.


Q: What should I know about taking Xorox if I am pregnant or breastfeeding?

A: Official documents state that use during pregnancy is conditional, and regulatory guidance specifies that use is determined by whether the potential benefit justifies the potential unknown risk. The medicine is also known to pass into breast milk, but the dose received by the infant is generally reported to be small.


Q: Can Xorox affect fertility?

A: The nonclinical toxicology sections of the prescribing information include data that address the potential for impairment of fertility in animal studies. This information is documented as part of the regulatory review process for the drug.

How should Xorox be stored and disposed of?

The storage and disposal instructions for Xorox (Aciclovir) are defined by regulatory labeling to maintain product quality and ensure safety.

Official Storage Requirements

Condition Requirement (Oral and Topical Forms)
Temperature Store below 25 C (room temperature range).
Protection Keep protected from light and moisture.
Prohibited The medicine must not be frozen. Topical creams should not be refrigerated.
Container Keep in the original container, which must be tightly closed.

Child Safety and Disposal

All forms must be strictly kept out of the sight and reach of children. Unused or expired Xorox must not be thrown away with household waste or disposed of via wastewater. Disposal should be managed by asking a pharmacist or following local environmental regulations to protect the environment.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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