Hascovir

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Medically reviewed

Rosario Oropesa

Last updated on 22/12/2025

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 Hascovir

What is Hascovir? Identity and Classification

Property Description
Active ingredient Aciclovir (Acyclovir)
Forms Tablets, Oral Suspension, Cream
Pharmacological class Antiviral Agent
General purpose To control the spread of herpes group viruses
Origin Synthetic purine nucleoside analog

Hascovir is a prescription medicine containing the active substance Aciclovir (Acyclovir), which is classified as an Antiviral Agent. Aciclovir is fundamentally a synthetic purine nucleoside analog, meaning it is a chemically engineered compound designed to interfere specifically with viral reproduction.

The medicine is a single-ingredient product whose purpose is to target infections caused by members of the herpes group, such as the Herpes simplex virus (HSV) and the Varicella-zoster virus (VZV). Its classification as an antiviral agent places it within a class of drugs that specifically target these pathogens.


Aciclovir Composition and Available Forms

The drug's effectiveness stems entirely from the Aciclovir component, a unique compound synthesized to mimic natural genetic building blocks. Hascovir is available in multiple dosage form(s) to suit varied needs, including tablets and oral suspension for systemic use, and a cream for topical administration. This range allows the medicine to be delivered either throughout the body or concentrated at a specific external site.

The forms available dictate the necessary route of administration. Aciclovir is clinically recognized for its action in mitigating outbreaks. The choice of form simply ensures the single active substance, Aciclovir, reaches the required site of action.


How Does Hascovir Generally Help?

Hascovir generally helps by selectively inhibiting the targeted viruses' ability to multiply, thereby limiting the proliferation of viruses associated with the herpes group. The mechanism involves Aciclovir functioning as a Viral DNA polymerase inhibitor, a process that blocks the virus from copying its genetic material. The general purpose of this antiviral agent is to control the progression of viral infections by interrupting their fundamental reproductive machinery.

Regulatory References

  1. NIH MedlinePlus Drug Information
  2. WHO Essential Medicines List
  3. EMA Public Assessment Report

What side effects are possible with Hascovir?

Possible Side Effects and Safety Information

The safety profile of Hascovir, which contains Aciclovir, is formally categorized by regulatory authorities based on the affected body system and frequency of occurrence.

Officially Documented Adverse Reactions

The most frequent adverse effects are generally classified as Common (occurring in 1 in 10 to 1 in 100 people) and primarily involve the Nervous System and Gastrointestinal System. These commonly reported effects include headache, dizziness, nausea, vomiting, and diarrhoea. Dermatological reactions, such as rashes and pruritus (itching), are also listed in the Common category, and these effects, along with fatigue and fever, are described in official safety labeling.

Uncommon effects include urticaria (hives) and accelerated diffuse hair loss.

Serious and Rare Safety Events

More critical adverse reactions are classified as Rare or Very Rare. Rare effects include Anaphylaxis (a severe allergic reaction) and Angioedema, as well as increases in blood urea and creatinine, which are indicators of renal function. Very Rare effects involve the Blood and Lymphatic System (e.g., anaemia, leukopenia) and the Hepatobiliary System (e.g., hepatitis, jaundice). Acute renal failure is documented as a Very Rare event, as are severe neurological reactions like seizures and coma; these neurological effects are generally described as reversible upon discontinuation of the medicine.

Population-Specific Safety Notes

Safety documents specify that older adults and individuals with renal impairment have an increased risk for reversible neurological side effects due to changes in drug clearance. Caution is officially advised regarding co-administration with other nephrotoxic agents, which may increase the risk of renal dysfunction. The systemic effects differ from the topical cream, which is primarily associated with local skin reactions.

Overdose and Emergency Response

Overdose and when to seek help

The following information is based strictly on official governmental regulatory documentation concerning Aciclovir (Hascovir) overdose.

Overdose Scope

Element Official Regulatory Documentation
Documented overdose presentations Overdose may present with neurological symptoms (e.g., agitation, confusion, hallucinations, headache, seizures, coma) and gastrointestinal effects (nausea, vomiting).
Physiological systems affected The central nervous system and the renal system are the primary physiological systems affected.
Dose-related or exposure-related factors Acute renal failure is associated with high doses. Neurological effects are reported after both oral and intravenous overdosage.
Population-specific overdose notes Elderly patients and patients with underlying renal impairment are at increased risk of experiencing neurological side effects.
Emergency-response statements Contact a Poison Control Center or seek immediate medical attention. Patients should be observed closely for signs of toxicity.
When immediate medical help is required Immediately call emergency services (911/999 equivalent) if the individual has collapsed, has a seizure, has trouble breathing, or cannot be awakened.

Overdose Classifications (High-Level)

Classification Type Official Regulatory Documentation
Severity classification Manifestations can range from reversible effects to severe or life-threatening outcomes such as acute renal failure and coma.
Overdose-context constraints Management is generally symptomatic and supportive. There is no specific antidote listed in the official label.

Resulting overdose structure

Official overdose statements:

  • Overdose may lead to elevations of serum creatinine and blood urea nitrogen and subsequent acute renal failure.
  • Haemodialysis may be considered a management option for symptomatic overdose, as it significantly enhances the removal of Aciclovir from the blood.
  • Documented neurological signs include confusion, agitation, hallucinations, seizures, and coma.
  • Symptomatic and supportive treatment are the primary officially described management measures.

Connection to the overall overdose profile: Regulatory documents define the overdose profile of Aciclovir by detailing the documented severe effects on the renal and central nervous systems, which necessitate immediate external intervention. Official labeling explicitly requires the immediate contact of emergency services for severe, life-threatening symptoms such as seizures or collapse and specifies that the management involves close observation and supportive measures like haemodialysis for significant removal of the active substance. This information dictates the conditions under which urgent medical help must be sought.

Therapeutic Uses of Hascovir

Hascovir is commonly used to help manage a range of conditions and symptoms caused by the herpes family of viruses. It may be part of symptomatic management for outbreaks like shingles, chickenpox, and initial or recurrent genital herpes episodes.


Acute Symptom Relief and Comfort

This medication is applied in addressing symptom clusters that create noticeable physiological strain, such as painful lesions, blisters, and sores on the skin. It is also relevant for easing associated symptoms like burning and itching. The core therapeutic benefit is that it generally supports the patient during difficult episodes by easing distress and may assist in managing the visible manifestations of the infection.

Quick Fact: Applied in addressing symptoms that create noticeable physiological strain.


Support for Recurrent and Episodic Manifestations

For patients experiencing frequent, recurrent episodes, this use is generally relevant in conditions characterized by episodic or fluctuating manifestations. It may assist with managing the severity of recurring symptoms, which provides support that helps ease the overall symptom burden by lessening the frequency and intensity of future episodes. This contributes to easing the overall symptom load during symptomatic periods.

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

Who can and cannot use Hascovir? Official Regulatory Information

Regulatory documentation defines specific populations and conditions that affect eligibility for Hascovir (Aciclovir) use.


Eligibility Scope

Classification Population/Condition Regulatory Status
Contraindicated Known clinically significant hypersensitivity to aciclovir or valaciclovir Must not use
Conditional Use Renal Impairment or Elderly Patients Dose adjustment and close monitoring required
Conditional Use Pregnancy Use considered only when potential benefits outweigh risks (FDA Category B)
Conditional Use Breastfeeding Caution advised due to drug excretion into breast milk
Caution Advised Patients with dehydration, neurological abnormalities, or severe hepatic/electrolyte problems Must be closely monitored
Not Recommended Neonatal/Severe HSV Infections Intravenous form is the standard of care

Eligibility-Related Restrictions

Patients with reduced renal function—including the elderly—are required by regulation to have a dosage adjustment because the drug is eliminated primarily through the kidneys. In severely immune-compromised individuals, there is a documented risk for the selection of viral strains with reduced sensitivity to aciclovir. Absolute contraindication is reserved for patients with a documented allergy to the active substance or valaciclovir, a related antiviral.

What should I know about interactions with other medicines?

Hascovir (aciclovir) is primarily eliminated from the body through the kidneys. When taken with other medicines that also affect kidney function or the way the kidneys excrete drugs, the level of aciclovir in the bloodstream can be increased. This may lead to an elevated risk of side effects, particularly neurotoxicity or nephrotoxicity.

Always inform your doctor or pharmacist about all medicines, over-the-counter products, and herbal supplements you are currently taking before starting Hascovir treatment.

Potential Drug Interactions with Hascovir

Interacting Medicine Potential Effect
Probenecid (for gout) Increases aciclovir levels by reducing its renal clearance. This can lead to increased risk of toxicity.
Cimetidine (for stomach ulcers/reflux) May increase aciclovir levels by a similar mechanism, requiring monitoring.
Mycophenolate Mofetil (immunosuppressant) Concurrent use may increase plasma concentrations of both drugs, and there is a risk of additive bone marrow suppression (e.g., neutropenia) and/or increased aciclovir-related side effects.
Other Nephrotoxic Drugs Medicines that can harm the kidneys (e.g., some non-steroidal anti-inflammatory drugs) may increase the risk of kidney problems when taken with Hascovir.

Close medical monitoring and potential dose adjustments are necessary if Hascovir is taken concurrently with these or other interacting medications, especially in patients with pre-existing kidney impairment.

Mechanism of Action

Selective Bioactivation and Mechanism of Action

The action of Hascovir (Aciclovir) begins with selective bioactivation, an essential step that establishes cellular specificity. Aciclovir is a synthetic prodrug that is primarily converted into its active, potent form—Aciclovir Triphosphate—by the Viral Thymidine Kinase (TK) enzyme. Since this enzyme is produced almost exclusively by the targeted herpes viruses (HSV and VZV), the drug accumulates mainly in virus-infected cells. This specificity limits the drug’s activation to regions where the infection is active.

Once activated, the drug targets the Viral DNA Polymerase. It acts as a competitive inhibitor and, critically, causes obligate chain termination when incorporated into the growing viral DNA strand, immediately halting the pathogen’s ability to copy its genetic material. This profound interruption of the viral DNA replication pathway controls the active viral burden and restricts the output of new virus particles to adjacent tissues. However, the mechanism is constrained against latent (dormant) viruses because the required activating enzyme (TK) is not sufficiently produced during the dormant phase.

Dosage and Administration Information

How Hascovir is Used: Administration Guidelines

Hascovir (Aciclovir) is administered according to specific, standardized instructions. The medicine is available for systemic delivery via the Oral (tablets, capsules, or suspension) and Intravenous (IV) Infusion routes, as well as for Local delivery through Topical and ophthalmic forms.

Dosing and Frequency Patterns

The required dose and frequency vary significantly based on the intended use. Acute treatment for infections like Herpes Zoster (shingles) typically requires a high frequency, such as 800 mg taken five times daily. Conversely, long-term suppressive therapy for recurrent conditions is usually administered at a lower frequency, such as 400 mg taken two times daily. Regardless of the dose, treatment should be initiated as early as possible, preferably at the first sign of an episode.

Administration Requirements

Oral formulations can generally be taken with or without food. For patients receiving systemic treatment, particularly the IV form, adequate hydration is required to support drug clearance. The intravenous solution must be administered via a slow infusion over one hour to follow established procedural constraints. Dosage adjustments are mandatory for older adults and patients with reduced kidney function, as the medicine is significantly dependent on proper renal clearance for elimination.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Hascovir

Evidence for Managing Acute Herpes Zoster (Shingles)

The research base for Hascovir (Aciclovir) in shingles primarily consists of Randomized Controlled Trials (RCTs) and systematic reviews used in research exploring how symptoms change over time. These trials typically focused on immunocompetent adults who began treatment in the early stages of the rash. Researchers monitored outcomes describing episodic or acute changes, specifically tracking the speed of blister healing and rash progression. Research explored patient-reported outcomes describing perceived discomfort, focusing on the severity and duration of the acute pain associated with the rash.

Evidence for Initial and Recurrent Genital Herpes

Evidence for the use of Hascovir in genital herpes was evaluated in numerous RCTs and comprehensive Meta-analyses. Studies were designed to address two distinct scenarios: short-term treatment for an active episode and long-term research for suppression therapy. For suppressive use, studies monitored the frequency of clinical recurrences and the presence of asymptomatic viral shedding. Studies monitored patterns related to the frequency of clinical recurrences during the defined observation periods.

Long-Term Research and Follow-Up Duration

Studies exploring long-term outcomes are primarily relevant to shingles and recurrent genital herpes. For shingles, research examined the development of Postherpetic Neuralgia (PHN). Some studies tracked the correlation between early treatment and measurements of pain at specific follow-up intervals, but findings across the research were mixed. Evidence quality varies across studies, and research indicates that the incidence of PHN was not consistently prevented in all studies.

Research Gaps and Areas of Uncertainty

A key area of uncertainty for shingles relates to the long-term effects on PHN prevention, as certainty remains low across all available evidence. For chickenpox, studies observed that the measured outcomes varied based on the time treatment was initiated, and there is limited information for outcomes related to the prevention of future shingles episodes. Additionally, follow-up durations were limited in many trials, meaning long-term effects are not fully established for several conditions, and evidence for certain groups remains insufficient.

Key Studies & References

  1. Genital herpes: oral antiviral treatments (Cochrane Review/Evidence Tables for WHO Guidelines)
  2. Public Assessment Report Scientific discussion Aciclovir Accord 200 mg, 400 mg and 800 mg tablets (EMA/National Agency Regulatory Document)
  3. Public Assessment Report Scientific discussion Herpirax 50 mg/g, cutaneous stick (EMA/National Agency Regulatory Document for topical Aciclovir)

Frequently Asked Questions (FAQ)

Common questions about Hascovir (FAQ)

Q: What is the main difference between Hascovir and other medicines used for the same purpose?

A: Hascovir, which contains aciclovir, is a drug with relatively low oral bioavailability, meaning only a small percentage is absorbed into the bloodstream. This property often leads to a shorter half-life, which may require it to be taken more frequently than some related antiviral agents. Other antivirals, such as valaciclovir, are known as prodrugs that are designed to convert to aciclovir in the body, potentially resulting in higher bioavailability and less frequent dosing.

Q: Why is Hascovir prescribed for conditions other than the primary one it is known for?

A: Official regulatory documents indicate that Hascovir is approved for a range of related conditions caused by both the Herpes simplex virus (HSV) and the Varicella-zoster virus (VZV). Its uses include the treatment of initial and recurrent genital herpes, as well as infections like shingles (herpes zoster) and chickenpox (varicella). This breadth of use reflects the drug's activity against these specific members of the herpes group of viruses.

Q: How quickly should I expect to see an effect after starting Hascovir?

A: According to official product information, the medicine reaches its peak concentration in the bloodstream approximately 1.5 to 2 hours after an oral dose. Clinical studies have shown that beginning treatment early can help shorten the time to lesion scabbing and healing. Regulatory documents indicate that the onset of clinical benefit is related to prompt initiation of therapy, and the overall time to healing varies by the specific condition being addressed.

Q: Is it common to feel slightly nauseous when taking Hascovir?

A: Yes, nausea and vomiting are listed among the Common adverse effects of Hascovir in official regulatory safety documents. A Common effect means it has been reported to occur in between 1 in 10 and 1 in 100 people taking the medicine.

Q: Are there any specific foods or drinks that should be avoided while using Hascovir?

A: Official patient information generally states that oral Hascovir can be taken with or without food. Regulatory drug interaction documents primarily focus on other medicines and do not specifically advise avoiding particular foods or non-alcoholic beverages.

Q: Do studies support the use of Hascovir for reducing the frequency of outbreaks?

A: Yes. Clinical evidence and public health guidelines support the use of Hascovir as a long-term suppressive therapy for recurrent conditions like genital herpes. Research data indicates that continuous suppressive therapy can significantly reduce the frequency of recurrences among patients who experience frequent outbreaks.

Q: Can Hascovir be taken indefinitely, or is it only for short periods?

A: Hascovir is authorized for both short-term use for acute treatment and for long-term suppressive therapy for recurrent conditions. Regulatory safety data supports its use over extended periods. Guidelines associated with regulatory bodies suggest that long-term therapy may be reviewed periodically to determine continued necessity.

Q: What if I accidentally take more Hascovir than the recommended amount?

A: Regulatory safety documents state that a single, accidental intake of slightly more Hascovir than recommended is unlikely to cause acute harm. However, symptoms of taking too much can include neurological effects like confusion and hallucinations, and signs of kidney problems. These effects are typically described in official documents as reversible upon discontinuation and supportive measures.

Q: What kind of monitoring might be required when taking Hascovir?

A: Official documents advise close medical monitoring for patients taking high doses or those with pre-existing reduced kidney function, including elderly patients. This monitoring often involves assessing renal function through standard laboratory measurements, as outlined in the prescribing information. Official prescribing information also emphasizes the importance of maintaining adequate hydration.

Q: What does the research say about Hascovir's effectiveness in preventing transmission?

A: Research indicates that suppressive therapy with Hascovir can reduce the amount of asymptomatic viral shedding that occurs. However, regulatory documents often caution that there is no specific data available confirming that the drug prevents the transmission of infection to other people. The lack of data means that general safe practices remain relevant for transmission prevention.

Q: Can Hascovir cause sleep disturbances or changes in mood?

A: Official safety documents list neurological reactions and psychiatric effects, such as dizziness, confusion, and hallucinations, as uncommon or rare side effects. Although not explicitly named as 'sleep disturbances' or 'mood changes,' these documented neurological effects may be related to such symptoms. These are documented as potential, though uncommon, effects.

Q: Why is Hascovir sometimes given as a preventative measure?

A: Hascovir is formally indicated for the prevention (prophylaxis) of certain infections. This preventative role is specifically recognized for immunocompromised patients or for the long-term suppression of frequently recurring genital herpes. The drug functions by inhibiting viral replication, thereby limiting the occurrence of new outbreaks.

Q: Is a prescription always required to get Hascovir?

A: The systemic forms of Hascovir, such as tablets, capsules, and the IV solution, are classified as prescription-only medicines in the US and many other jurisdictions. However, lower-strength topical forms containing the active ingredient (aciclovir) are sometimes available over-the-counter (OTC) for conditions like cold sores.

Q: What happens in the body if Hascovir is stopped suddenly?

A: Regulatory guidance on long-term suppressive therapy suggests treatment should be interrupted periodically to assess the condition. Official documents do not typically describe specific withdrawal symptoms upon sudden cessation. However, stopping long-term suppressive use may result in the recurrence rate of the condition returning to previous levels.

Q: Does official information warn about sun exposure while using Hascovir?

A: Yes. Official patient information materials and safety data may include a caution that Hascovir can cause a condition called photosensitivity, which makes the skin more sensitive to the sun. Due to this potential for photosensitivity, official patient information often includes recommendations for protective measures, such as wearing protective clothing and using sunscreens.

Q: What should I do if I miss a dose of Hascovir, based on general guidance?

A: General patient guidance advises that if an oral dose is missed, it should be taken as soon as it is remembered. However, if it is nearly time for the next scheduled dose, official guidance recommends skipping the missed dose and continuing with the regular schedule. Regulatory guidance notes that adherence to the dosing schedule is important for maintaining consistent antiviral drug levels.

How should Hascovir be stored and disposed of?

How to Store and Dispose of Hascovir?

Hascovir (aciclovir) must be stored according to specific regulatory requirements to maintain product integrity.

Storage Conditions

Hascovir tablets require storage at Controlled Room Temperature, defined as 15 to 25 C (59 to 77 F). The medicine must be protected from light and moisture and kept in its tightly closed, light-resistant container. The oral suspension should not be refrigerated or frozen and must be discarded 30 days after first opening. All forms must be stored out of the reach and sight of children.


Disposal Instructions

Expired or unused Hascovir must not be disposed of in household trash or poured down a sink or toilet. Disposal must be completed in accordance with local requirements, typically through an official medicine take-back program.

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

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