Deherp

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Medically reviewed

Laura Arias

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 Deherp

Property Description
Active Ingredient Aciclovir (INN)
Primary Forms Tablets, Capsules, Topical Cream, Intravenous Solution
Pharmacological Class Antiviral Agent (Synthetic Purine Nucleoside Analog)
General Purpose Management of Herpes-Family Viral Activity
Origin Synthetic

What Type of Medicine is Deherp (Aciclovir)?

Deherp is a prescription-only medication containing the active substance Aciclovir, which is classified as a highly targeted antiviral agent used to manage infections caused by certain viruses, particularly those in the herpes family. This single-ingredient product is engineered to combat pathogens such as the Herpes Simplex Virus (HSV) and the Varicella-Zoster Virus (VZV). Its classification as an antiviral agent distinguishes it from other antimicrobial classes, confirming its focused therapeutic application against viral invaders. Aciclovir acts by slowing the growth and spread of the herpes virus.


Composition and Forms: Is Aciclovir Synthetic?

The core component, Aciclovir, is a synthetic purine nucleoside analog, and Deherp is supplied in multiple forms for both systemic and local administration. This compound is chemically synthesized to function as an antimetabolite, mimicking a natural building block required for viral genetic replication. The available dosage forms include tablets and capsules for oral use, preparations for intravenous administration, and topical cream or ointment for localized treatment. This variety of forms ensures the medication can be administered via the optimal route of administration depending on the infection's extent and site. Aciclovir is noted for its target-specific activation by viral enzymes.


How Does Deherp Generally Help Manage Viral Activity?

The general purpose of Deherp is to limit the spread and severity of a viral infection by halting the virus's ability to reproduce. The active ingredient, Aciclovir, works selectively within cells already infected by the target virus by interrupting the process of viral replication. By terminating the formation of new viral DNA, the medicine helps contain the infection. Medications in this class are used to reduce the duration and severity of the viral episode. For instance, a typical use involves managing flare-ups of recurrent viral symptoms to hasten recovery.

Regulatory References

  1. U.S. National Library of Medicine
  2. [NIH MedlinePlus]

What side effects are possible with Deherp?

Possible Side Effects and Safety Information

The safety profile of Deherp (Aciclovir), as documented in official regulatory sources, outlines its possible adverse reactions categorized by frequency and the body system affected. All classifications reflect incidence rates observed in clinical trials and post-marketing surveillance.


Official Adverse Reaction Classification

Adverse reactions are formally grouped into system-organ classes (SOC) including Gastrointestinal Disorders, Nervous System Disorders, Skin and Subcutaneous Tissue Disorders, and Renal and Urinary Disorders.

Frequency Examples of Officially Listed Side Effects
Common Headache, dizziness, nausea, vomiting, diarrhoea, abdominal pains, fatigue, rashes, pruritus.
Uncommon Urticaria, accelerated diffuse hair loss (reported as reversible).
Rare Anaphylaxis, angioedema, reversible increases in bilirubin, and renal markers (urea and creatinine).
Very Rare Acute renal failure, encephalopathy, convulsions, hepatitis, jaundice, blood disorders (e.g., anemia, thrombocytopenia).

Safety Considerations and Constraints

Certain clinically important reactions, such as Acute Renal Failure and severe neurological effects like Encephalopathy, are classified as Very Rare but serious. The official prescribing information notes that these neurological effects are generally reversible upon discontinuation of the medicine and/or provision of fluid support.

Specific safety considerations exist for special populations. Older adults and patients with renal impairment are documented as being at an increased risk of neurological side effects due to slower drug clearance. For intravenous (IV) administration, adequate hydration is a necessary constraint to mitigate the risk of renal toxicity.

Overdose and Emergency Response

Overdose and When to Seek Help

This information describes the documented profile of Deherp (Aciclovir) overdose as stated in official government regulatory documents.

Documented Manifestations and Severe Outcomes

Overdose, particularly with high-dose intravenous administration, can severely affect the renal and central nervous systems. Documented clinical manifestations include neurological disturbances such as agitation, confusion, hallucinations, and progressing to severe outcomes like seizures and coma. On the renal side, overdose can lead to acute renal failure, decreased urination, and the physical precipitation of the drug in the renal tubules (crystalluria). Other reported signs of overdose, often associated with repeated oral exposures, include extreme tiredness and swelling of the extremities.

Emergency Action and Supportive Measures

Regulatory guidance states that immediate medical attention is required for severe symptoms. You must contact emergency services if the individual has collapsed, had a seizure, has trouble breathing, or cannot be awakened. Management consists of symptomatic and supportive care. Haemodialysis is noted as a management option because it significantly enhances the removal of Aciclovir from the bloodstream, a procedure often necessary in cases of symptomatic toxicity.

Special Considerations

Official labeling specifies that elderly patients and individuals with pre-existing reduced kidney function are at an increased risk of developing neurological side effects in an overdose scenario. This risk is also elevated when high doses are given without proper monitoring of fluid and electrolyte balance.

Therapeutic Uses of Deherp

Deherp (Aciclovir) is commonly used across conditions presenting with acute, symptomatic episodes caused by the herpes family of viruses. This includes conditions such as Herpes Zoster (Shingles), Genital Herpes, Herpes Labialis (Cold Sores), and Chickenpox. It is applied across therapeutic domains where additional symptomatic support is needed.

Management and Benefits

The medication is commonly used to help with symptoms related to physical discomfort, such as painful blisters, ulcers, and the burning or tingling sensations that are associated with the beginning of an episode. In these acute scenarios, Deherp provides support that helps ease the overall symptom burden by contributing to the easing of symptomatic intensity and supports the healing process. For patients with recurrent issues, it may be used in suppressive therapy to assist with maintaining functional stability by helping to reduce the frequency of future episodes.

“Applied in scenarios where additional management of discomfort is required.”

Quick Fact: Relief for Vesicular Lesions

Eligibility and Restrictions for Use

Eligibility Map: Who can and cannot use Deherp — Official Regulatory Information

The eligibility for using Deherp (Aciclovir) is strictly defined by government regulatory documents, focusing on patient characteristics and pre-existing conditions.

Category Official Regulatory Statement
Populations for whom use is contraindicated Patients with known, clinically significant hypersensitivity to Aciclovir, Valaciclovir, or any component of the specific formulation.
Condition-specific eligibility rules Patients with impaired renal function require a dosage reduction because the medicine is primarily cleared by the kidneys. Caution is advised for those with pre-existing dehydration or underlying neurological abnormalities.
Age-related eligibility rules Adults and children over 2 years old are generally considered eligible. Older adults are often managed under conditional use due to the likelihood of reduced renal function. The safety and effectiveness of some topical formulations have not been established in children under 12 years of age.
Pregnancy and lactation eligibility status Use during pregnancy is permitted only when the potential benefits justify the potential risk. Caution is advised for breastfeeding mothers as the substance is found in breast milk.

Eligibility Classifications (High-Level)

The regulatory profile classifies use as Contraindicated for hypersensitivity, and Conditional Use for patients with renal impairment, older adults, and during pregnancy or lactation. The patient’s renal clearance status and hydration level are defined as critical eligibility constraints by regulatory authorities.

What should I know about interactions with other medicines?

Interactions with other medicines and products — official regulatory information for Deherp (Aciclovir)

The official regulatory profile for Aciclovir interactions primarily identifies medicinal products that alter its systemic exposure by interfering with the body's elimination process. No strictly contraindicated combinations are listed based on drug-drug interaction risk in official documents.

Specific Interacting Substances and Formal Outcomes

Certain medicinal products are officially listed as interacting with Aciclovir. Probenecid and Cimetidine both initiate a formal pharmacokinetic interaction through the mechanism of competitive inhibition of active renal tubular secretion. This process results in a documented outcome of increased plasma concentration and increased Area Under the Curve (AUC) of Aciclovir. Co-administration with the immunosuppressant Mycophenolate Mofetil has also been shown to increase Aciclovir plasma exposure, and the combination is noted for the risk of additive hematologic toxicity. Furthermore, co-administration with Theophylline is documented to increase the AUC of the administered Theophylline. The official label states that food has no clinically significant effect on the oral absorption of Aciclovir.

Population Considerations and Constraints

The documented exposure-modifying interactions are formally noted as being more clinically significant in elderly patients and individuals with pre-existing renal impairment. The combination with other potentially nephrotoxic drugs is subject to a formal restriction due to the enhanced risk of renal dysfunction.

Mechanism of Action

The action of Aciclovir (Deherp) is defined by its ability to interfere precisely with the viral replication process, primarily through highly targeted enzymatic activation and subsequent DNA synthesis blockade.

Selective Activation by Viral Enzymes

This domain covers the critical molecular steps where the drug is recognized and activated by the virus's own machinery. Aciclovir relies on the virus-encoded Viral Thymidine Kinase to convert it from its inactive state into its initial active form, defining the drug's selectivity for cells actively infected by the virus. This process ensures the therapeutic mechanism is selectively engaged at the site of viral activity.

Blockade of Viral DNA Synthesis

This core mechanism involves the final, active form of the drug, Aciclovir Triphosphate (ACV-TP), targeting the Viral DNA Polymerase. By mimicking a natural nucleoside, ACV-TP incorporates into the growing viral DNA strand but prevents any further genetic material from being added, resulting in immediate chain termination. This molecular blockade terminates viral replication, resulting in the functional suppression of viral proliferation.

Constraints Based on Viral Genetics

This domain addresses the biological boundary conditions of the drug's efficacy. Since the mechanism is dependent on the functionality of the Viral Thymidine Kinase, the development of mutations that impair this enzyme can prevent the drug’s activation, resulting in the functional cessation of the drug's mechanism of action against the resistant strain.

Dosage and Administration Information

Deherp (Aciclovir) is administered through several routes, depending on the severity and location of the infection. The primary administration modes include oral (tablets, capsules, and suspension), intravenous (IV) infusion for systemic use, and topical preparations for localized application.

The dosing schedule is structurally defined by the treatment purpose. For acute episodic treatment, oral regimens generally require 200 mg or 800 mg doses administered up to five times daily (approximately every four hours while awake) for a fixed duration of 7 to 10 days. Conversely, long-term suppressive therapy typically involves a reduced frequency, such as 400 mg twice daily, continuing for extended cycles often lasting 12 months or longer.

Specific contextual conditions apply for proper use. Oral forms can be taken with or without food, and consuming a full glass of water or maintaining adequate hydration is required for all systemic routes. For the IV solution, administration must follow specific procedural steps: the concentrate requires mandatory dilution and must be delivered via slow infusion over at least one hour; it is not approved for rapid injection. Furthermore, dose adjustment is necessary for older adults and is required for any patient exhibiting reduced renal function, where modification is calculated based on measured creatinine clearance. Treatment, regardless of the route, must be initiated at the earliest possible sign or symptom.

Recent Clinical Evidence

Research evidence / Overview of Studies for Deherp (Aciclovir)


Evidence from Trials for Genital Herpes Episodes

Research on Deherp (Aciclovir) for use in genital herpes involves Randomized Controlled Trials (RCTs) and comprehensive Systematic Reviews. These studies were conducted during periods of increased symptom activity and used in research exploring how symptoms change over time. Researchers focused on outcomes related to episodic or acute changes, such as measurements of the time until vesicular lesions achieved complete healing and the duration of acute symptoms. The evidence contributes to understanding symptom patterns in conditions characterized by fluctuating or episodic manifestations.

Research Findings for Suppressing Recurrent Genital Herpes

Beyond evaluating acute episodes, Deherp was evaluated in long-term studies to explore its use in chronic suppressive regimens. These studies monitored outcomes reflecting daily functioning or activity level by tracking the frequency of new episodes over periods often lasting 6 to 12 months. However, long-term effects are not fully established regarding continuous use over many years, as follow-up durations were limited in many of the core trials.

Studies for Acute Herpes Zoster (Shingles) Management

For acute Herpes Zoster (Shingles), the research base includes RCTs that focused on evaluating the acute, painful episode. These studies examined outcomes related to physical discomfort, such as the time needed for lesions to heal and the change in measured acute pain scores.

Studies Tracking Outcomes Following Shingles

A critical aspect of the research is the tracking of long-term outcomes, particularly the development of Post-Herpetic Neuralgia (PHN). Research findings show variability regarding an association between acute treatment and the subsequent incidence of this long-term pain. Certainty remains low in some study areas regarding PHN outcomes, and evidence quality varies across studies.

Summary of Evidence Gaps and Uncertainties

While extensive research has been studied for Deherp across its main uses, there is limited information for long-term outcomes that track patients over several years, especially for continuous suppressive therapy. Studies indicate that subgroup findings are uncertain in some specialized patient cohorts, and follow-up durations were limited in certain key trials.

Key Studies & References

  1. Acyclovir Tablets, USP Rx only - DailyMed (Official FDA Labeling)
  2. Oral acyclovir in acute herpes zoster - British medical journal (RCT Summary)

Frequently Asked Questions (FAQ)

Common questions about Deherp (FAQ)


Q: How long does it typically take to start feeling the effects of Deherp?

Regulatory information on Aciclovir (Deherp) generally measures the medicine's effect by tracking outcomes in clinical studies, such as the time it takes for viral lesions to achieve complete healing. These studies focus on the overall progression of the episode rather than the time until a patient might feel an initial effect. Regulatory information states that treatment is intended to be initiated as soon as possible after the first sign of an outbreak.


Q: Does Deherp cause drowsiness?

Official regulatory information lists dizziness and headache as common side effects associated with Aciclovir (Deherp). While the specific term "drowsiness" may not be consistently listed across all official documents, official safety information indicates that if a patient experiences neurological effects, caution is required before engaging in activities like driving or operating heavy machinery.


Q: Can Deherp be taken with common pain relievers like ibuprofen?

According to the official regulatory profile, there is a caution regarding the co-administration of Aciclovir (Deherp) with other medicines that are classified as potentially nephrotoxic. These are substances that carry a risk of affecting the kidneys. Although common pain relievers like ibuprofen are not named specifically, they are part of a broader group of medicines that may fall under this caution due to the enhanced risk of renal impairment.


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

Regulatory product information indicates that food has no clinically significant effect on the oral absorption of Aciclovir (Deherp), meaning it can be taken with or without food. Although there is typically no formal prohibition against alcohol in the drug's official label, official health warnings note that alcohol consumption may potentially exacerbate common side effects, such as dizziness.


Q: Why do some people experience stomach upset when they start Deherp?

Gastrointestinal symptoms, including nausea, vomiting, and abdominal pains, are classified in official documents as common adverse reactions to Aciclovir (Deherp). These effects are related to how the medicine is absorbed and processed by the body. The official guidance notes that taking the medicine with food is consistent with the established use conditions and may be a way to manage stomach upset.


Q: How long after stopping Deherp might side effects continue?

The regulatory safety profile specifically addresses the reversibility of the more serious neurological side effects, noting that they are generally reversible upon discontinuation of the medicine. The official documents do not provide a specific timeline for how long common and milder side effects, such as headache or fatigue, might persist after the course of Deherp has been completed.


Q: Are there any long-term side effects associated with Deherp use?

The official prescribing information lists certain serious adverse reactions, such as acute renal failure and blood disorders, that are classified as Very Rare. While research has extensively studied Deherp, the research overview indicates that the follow-up durations in some core trials were limited. Therefore, long-term effects over continuous use for many years are described as not fully established.


Q: What is the classification of Deherp (e.g., controlled substance, non-narcotic)?

Aciclovir, the active ingredient in Deherp, is formally classified as an antiviral agent and is a prescription-only medicine. Regulatory agencies, such as the U.S. Drug Enforcement Administration (DEA), do not classify Aciclovir as a controlled substance that possesses potential for abuse or dependence.


Q: Can Deherp be taken if I have a history of liver problems?

Official guidance requires a mandatory dose adjustment for patients with impaired renal (kidney) function, as the drug is primarily cleared by the kidneys. While side effects like hepatitis and jaundice are listed as Rare or Very Rare events, a specific dose adjustment for pre-existing liver problems is generally not specified in the drug’s official Summary of Product Characteristics (SmPC).


Q: What kind of studies have been performed to assess Deherp's safety?

The safety profile for Aciclovir (Deherp) is established using data gathered from multiple methods. These include findings from formal Randomized Controlled Trials (RCTs) conducted for efficacy, as well as an ongoing process of post-marketing surveillance, which continually monitors and assesses reported adverse reactions once the medicine is on the market.


Q: What is the official definition of a 'serious side effect' of Deherp?

Official regulatory documentation classifies all adverse reactions primarily by their observed frequency in studies and surveillance, such as Common, Rare, and Very Rare. Events listed under the Rare and Very Rare categories—including conditions like acute renal failure or anaphylaxis—are typically designated as the clinically important or serious side effects.


Q: If I miss a dose of Deherp, what information is usually provided in official instructions?

Official product information includes general instructions that describe how a missed dose is handled. These instructions generally state that if the time for the next dose is close, the missed dose is typically omitted. The instructions further specify that a double dose is not indicated to compensate for the missed one, and the patient is directed to continue with the regular schedule.


Q: Why is Deherp sometimes stopped before the full course is completed?

Treatment with Aciclovir (Deherp) is typically completed over a specific, fixed duration. However, the official safety documentation notes that serious neurological effects, although very rare, are generally reversible upon discontinuation of the medicine. This official statement indicates that the medicine's discontinuation may be required if serious adverse reactions occur during the course of treatment.


Q: Why does Deherp have a specific warning about alcohol consumption?

Official product labels often state that Aciclovir (Deherp) has no known direct pharmacokinetic interaction (how the body processes the drug) with alcohol. However, regulatory guidance notes that caution is often associated with consumption because alcohol can potentially exacerbate common side effects of the medication, such as dizziness and headache.


Q: Can I crush or split Deherp tablets, according to the official instructions?

Official instructions for standard oral forms of Aciclovir (Deherp) do not typically provide permission to crush or split the tablets. For certain specialized forms, such as buccal tablets, regulatory information specifically prohibits crushing, chewing, or splitting. This interpretation suggests that the standard tablet is intended to be swallowed whole unless the specific prescribing information explicitly states that crushing or splitting is allowed.


Q: What is the purpose of the 'inactive ingredients' listed in Deherp?

Inactive ingredients are components of the medicine that have no therapeutic effect or healing properties themselves. According to the official description, these substances, which include coloring agents, preservatives, and binding agents, are necessary to ensure the medicine can be manufactured into a stable form, such as a tablet or liquid formulation.


How should Deherp be stored and disposed of?

Deherp (Aciclovir) must be stored and disposed of according to official regulatory specifications to maintain its stability and effectiveness.

Official Storage Requirements

Condition Regulatory Mandate
Temperature Store at controlled room temperature, typically 59 F to 77 F (15 C to 25 C), for oral and topical forms.
Protection The medicine must be protected from light and moisture and kept out of the sight and reach of children.
Container Keep the medication in its original container, ensuring the container is tightly closed.
Handling Do not refrigerate the oral liquid suspension and avoid storage in high-humidity areas like the bathroom.

Official Disposal Instructions

To dispose of unused or expired product, do not flush it down the toilet or pour it into wastewater. The medication should be mixed with an undesirable substance, such as coffee grounds, and then sealed in a bag or container before being discarded in the household trash, as specified by regulatory guidelines. All identifying information on prescription labels must be scratched out prior to disposal.

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

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