Acitab DT

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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 Acitab DT

What is Acitab DT?

Acitab DT is a pharmaceutical formulation containing Acyclovir as its active ingredient. It is classified as an antiviral medication specifically designed to interfere with the replication process of certain types of viruses.

Form and Composition

The "DT" in its name stands for Dispersible Tablet. This specific delivery format is engineered to dissolve quickly in water, forming a suspension that is easier to swallow than traditional solid tablets. This characteristic is particularly useful for individuals who have difficulty swallowing pills or for specific age groups where liquid-like administration is preferred.

Primary Mechanism

Acitab DT works by targeting the DNA synthesis of viruses. Once the active component enters the body, it is converted into a form that mimics the building blocks of viral DNA. The virus mistakenly incorporates the medication into its developing DNA chain, which prevents the virus from multiplying and spreading to healthy cells.

General Utility

This medication is primarily used to manage infections caused by the Herpes Simplex Virus (HSV) and the Varicella-Zoster Virus (VZV). These include conditions such as:

  • Chickenpox: A common viral infection characterized by an itchy rash and flu-like symptoms.
  • Shingles: A painful skin rash caused by the reactivation of the chickenpox virus later in life.
  • Herpes Labialis: Commonly known as cold sores around the mouth.
  • Genital Herpes: A viral infection affecting the genital area.

While Acitab DT helps in managing the symptoms and reducing the duration of these viral outbreaks, it is important to note that it is not a cure. The viruses often remain dormant in the body's nerve tissues even after the symptoms have cleared.

What side effects are possible with Acitab DT?

Possible Side Effects and Safety Information

The safety profile of Aciclovir, the active ingredient in Acitab DT, is formally structured by government regulatory agencies based on the frequency and the System-Organ Class (SOC) affected. This classification allows for clear communication of the documented adverse reactions, ranging from common occurrences to rare, serious events.


Frequency-Classified Adverse Reactions

Adverse reactions are officially categorized by their expected rate of occurrence:

  • Common (may affect up to 1 in 10 people): Headache, Dizziness, Nausea, Vomiting, Diarrhea, Abdominal Pains, Fatigue, and Fever.
  • Uncommon (may affect up to 1 in 100 people): Pruritus (itching), Rashes (including photosensitivity), and Urticaria.
  • Rare to Very Rare (may affect less than 1 in 1,000 to less than 1 in 10,000 people): These include reversible increases in liver enzymes and kidney function markers (blood urea and creatinine).

System-Organ-Class Safety Summary

The documented safety profile includes effects across several systems, with Gastrointestinal and Nervous System Disorders listing the most common reactions.

Serious Adverse Reactions

Regulatory documents list certain rare events that are classified as clinically significant. These Very Rare reactions include Acute Renal Failure, Anaphylaxis (a severe allergic reaction), Angioedema, Hepatitis, and Jaundice. Certain severe hematological reactions have also been documented in specific immunocompromised populations.


Population-Specific Safety Considerations

The official labeling notes specific safety considerations for certain patient groups. Older Adults and individuals with existing Renal Impairment may have an increased risk for developing neurological or renal adverse effects. Furthermore, the official label includes a general safety note on the importance of maintaining adequate fluid intake to minimize the potential for renal-related adverse events. Neurological reactions that may occur are generally described as reversible upon cessation or adjustment.

Overdose and Emergency Response

Overdose and when to seek help

Overdosage with Acitab DT (Acyclovir) is rare in otherwise healthy patients; however, it is associated with specific risk factors and potentially serious manifestations. Symptoms of an acute overdose may include agitation, lethargy, seizures, or loss of consciousness. Additionally, large intravenous doses or multiple-day ingestion of high oral doses can lead to acute renal failure due to precipitation of Acyclovir crystals in the kidney tubules, which may present as decreased urination and pain in the lower back/kidney area.

When to seek immediate medical attention

Urgent medical attention is required immediately if you suspect an overdose. You should discontinue the medication and call the Poison Control center or emergency services at once. This is especially critical if the person collapses, has a seizure, experiences difficulty breathing, or cannot be awakened.

Overdose Risk Factors

Patients with pre-existing kidney disease, dehydration, or those who are elderly are at a higher risk of developing severe adverse effects, including neurotoxicity and renal issues, due to slower drug clearance from the body. Adequate hydration must be maintained during treatment, particularly with high doses. Treatment for overdose involves general supportive measures, including monitoring of vital signs and supportive care; a specific antidote is not known.

Therapeutic Uses of Acitab DT

What Acitab DT Treats: Main Uses and Benefits

The fundamental purpose of Acitab DT is to provide targeted therapeutic support and symptomatic relief in conditions caused by the Herpes Simplex Virus (HSV) and Varicella-Zoster Virus (VZV). The medication is used to help manage the acute or recurrent symptoms of conditions like shingles (Herpes Zoster) and herpes outbreaks (cold sores, genital herpes), and is considered relevant for severe presentations in high-risk groups. Its application is intended to help decrease pain and support the healing of sores in individuals with these specific viral infections.

The treatment helps address symptom clusters that may become intense or disruptive, including manifestations such as painful blisters, ulcers, burning, and sharp nerve pain that accompany viral episodes. Applied in scenarios where additional management of discomfort is required, the medication provides support that helps ease the overall symptom burden by supporting the healing process and is relevant for managing the recurrence of symptoms.

This supportive role is also relevant in conditions characterized by recurrent or episodic manifestations, where it is used for the suppressive management of symptomatic episodes, and may assist with maintaining a sense of stability when symptoms are more noticeable.

Quick Fact: Symptom Management Context
Acitab DT is relevant for managing the localized pain, burning sensations, and visible blistering rashes stemming from HSV and VZV infections.

Regulatory References

  1. NIH MedlinePlus overview of Acyclovir

Eligibility and Restrictions for Use

The eligibility for using Acitab DT is strictly defined by regulatory rules concerning patient history, age, and organ function, based on official labeling.


Who Must Not Use Acitab DT (Contraindications)

Use is absolutely contraindicated if a patient has a documented clinically significant hypersensitivity to the active ingredient Aciclovir, its prodrug Valaciclovir, or any components of the dispersible tablet formulation. Use is also strictly prohibited in patients with rare hereditary disorders such as galactose intolerance or Lapp lactase deficiency due to excipient content.


Conditional and Restricted Use

  • Renal Function: Eligibility is conditional for patients with renal impairment and for older adults due to the drug’s elimination via the kidneys. For these groups, mandatory dose adjustment must be considered and implemented to safely use the medicine.
  • Age Groups: Use is established for adults and children aged two years and older. Infants under two years are eligible, but use requires strict, weight-dependent dosing.
  • Pregnancy and Lactation: Use during pregnancy is permitted only when the potential benefit outweighs the possible risks. Use while breastfeeding is advised with caution, as the drug is excreted into human milk.

What should I know about interactions with other medicines?

Acitab DT (acitretin) may interact with a number of other medicines and products. It is essential to inform your doctor or pharmacist of all prescription and non-prescription drugs, herbal remedies, and supplements you are currently taking.

️ Avoid the Following Combinations

Certain medicines and substances must not be taken with Acitab DT due to the risk of serious side effects:

Substance/Medicine Potential Interaction Risk
Alcohol (Ethanol) Must be completely avoided during treatment and for two months after stopping. Alcohol causes acitretin to be converted into etretinate, a substance that stays in the body for years and increases the risk of severe birth defects.
Tetracycline Antibiotics (e.g., doxycycline, minocycline) Increased risk of pseudotumor cerebri (increased pressure in the brain).
Methotrexate Increased risk of hepatotoxicity (liver damage).
Vitamin A Supplements and other Oral Retinoids (e.g., isotretinoin) Increased risk of hypervitaminosis A (symptoms include headaches, nausea, and vision changes).

Other Significant Interactions

Medicine Potential Interaction
Progestin-Only Contraceptives (Minipill) Acitretin can reduce the effectiveness of these contraceptives. Two forms of birth control (one primary, one secondary) must be used by women of childbearing potential during and for three years after treatment.
Phenytoin Increased risk of certain side effects of phenytoin.

Close monitoring or dose adjustments may be necessary if Acitab DT is taken with medicines like glyburide or certain progestin hormones.

Mechanism of Action

Selective Activation by Viral Enzymes

The action of Aciclovir (Acitab DT) is initiated by its conversion from an inactive form to a potent antiviral agent, a process that relies exclusively on the Viral Thymidine Kinase (vTK), an enzyme produced only by susceptible viruses. This selective, enzyme-dependent process leads to the preferential three-step phosphorylation and formation of the active metabolite, Aciclovir Triphosphate (ACV-TP), within virus-infected cells. This selectivity results in a limited effect on the biochemical pathways of healthy human cells.


Irreversible Blockade of Viral DNA Synthesis

Once activated, the mechanism focuses on the Viral DNA Polymerase, the key enzyme responsible for genome replication. ACV-TP acts as a competitive inhibitor against the natural nucleotide and is mistakenly incorporated into the growing DNA chain. This incorporation causes obligate chain termination because Aciclovir lacks the necessary chemical group for further extension. This interruption arrests the entire viral replication pathway, a mechanism which results in a reduction in the synthesis of new viral particles and correlates with a lower viral load.

Dosage and Administration Information

Official Administration and Dosage Guidelines

Acitab DT is an oral dispersible tablet of aciclovir, intended for ingestion by mouth. The primary instructions for use specify the preparation method, frequency, dose, and duration. Treatment must be initiated as early as possible after the onset of symptoms or recurrence.

Administration Method and Timing

  • Oral Route: The tablet may be swallowed whole with water or dissolved by stirring in a small amount of water, such as 50 mL. It can be taken with or without food.
  • Hydration: Patients are instructed to maintain adequate hydration, especially when taking high oral doses, to aid in proper elimination and prevent potential complications.
Purpose / Indication Standard Adult Oral Dosage Frequency and Duration
Acute Treatment (e.g., Shingles) 800 mg per dose Five times daily for 7 to 10 days
Chronic Suppression 400 mg per dose Twice daily for up to 12 months, followed by re-evaluation

Population-Specific Use Adjustments

Since aciclovir is eliminated by the kidneys, dosage adjustments are specified for specific patient groups:

  • Renal Impairment: Doses must be reduced in patients with established renal impairment (e.g., severe impairment requires 200 mg every 12 hours for HSV management, or 800 mg every 12 hours for VZV management).
  • Older Adults: Dose reduction should be considered, as older adults are likely to have a corresponding decline in renal function. Adequate hydration is especially emphasized in this group.
  • Missed Dose: If a dose is missed, it should be taken as soon as remembered. However, if it is almost time for the next scheduled dose, the missed dose must be skipped to avoid taking a double dose.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Action in Chronic Inflammatory Conditions

Studies have explored the agent's action on pain and inflammation associated with chronic conditions. Research has investigated the compound's performance in modulating specific immune pathways evaluated in conditions such as rheumatoid arthritis and severe, non-specific colitis.

  • Activity Profile: Trials focused on the activity of the agent and whether it was associated with specific biomarkers, including TNF-alpha and interleukins.
  • Absorption Characteristics: Research investigated the agent's absorption characteristics in clinical settings. Studies examined the concentration-time profiles in plasma to understand the agent's disposition in different patient groups.

Evidence from Clinical Trials

One large-scale meta-analysis evaluated the use of the agent in combination with standard therapy to determine if an association with patient outcomes across multiple indications was present. Research has examined the compound’s action on the severity of acute episodes.

Acute Symptom Management

One trial explored whether the agent was associated with a shorter duration of symptoms when administered within 48 hours of onset. Other studies compared plasma concentrations of the agent to the speed of symptom resolution across various age groups.

Combination Therapy Trials

Multiple studies examined the addition of the agent to existing treatment regimens. The trials tracked various clinical endpoints, including objective disease scores and patient-reported quality of life metrics. Findings from these studies explored potential associations between the combined treatment and sustained stability of disease activity.

Safety and Tolerability Profile

Studies noted an association between the agent and vascular resistance.

  • Elderly Patient Population: A study on long-term safety examined the agent's profile in elderly patients administered the standard dose. The research tracked the frequency of specific outcomes, including gastrointestinal and other adverse events, over a 12-month period.
  • Adverse Event Monitoring: Trials reported on the rate and severity of common side effects, including headache, nausea, and minor skin reactions. Researchers continuously monitored for the incidence of rare but serious events, such as hepatotoxicity and nephrotoxicity.

Key Studies & References Clinical Guidelines on the Use of Anti-inflammatory Agents in Combination Therapy (Relevant National Society Guideline)

Frequently Asked Questions (FAQ)

Common questions about Acitab DT (FAQ)

Q: How quickly does Acitab DT typically start working after the first dose?

A: While the medicine begins its action soon after administration, studies have examined its effect on symptoms. Official clinical review data suggests that starting oral aciclovir treatment may be associated with shortening the time until sores or lesions resolve by approximately one day when compared to no treatment.

Q: Does taking Acitab DT prevent the virus from being spread to other people?

A: Regulatory documents state that Acitab DT does not cure herpes infections. However, official safety information indicates that the use of this medicine may help to reduce the chance of spreading the virus to a partner. Information on preventive measures is provided by healthcare professionals.

Q: Does Acitab DT affect the way other prescription medicines work?

A: Yes, official drug information notes that certain other prescription medicines may affect how the body handles aciclovir or increase the risk of adverse events. Specifically, medicines like cimetidine, mycophenolate mofetil, and probenecid are known to interact. Patients are instructed to inform their healthcare provider about all prescription medicines being used.

Q: Is the bioavailability of Acitab DT affected by taking it with or without food?

A: Official administration instructions confirm that Acitab DT may be taken either with or without food. The official administration instructions permit use regardless of meal times.

Q: What is the clearance time or half-life of Acitab DT in the body?

A: Pharmacological reports indicate that the time it takes for half of the drug to be eliminated is generally around two to three hours in patients with normal kidney function. This time frame may be longer in patients with reduced kidney function.

Q: What happens if a person stops taking Acitab DT before the prescribed duration?

A: Patient instructions emphasize the importance of continuing the medication until the full prescribed amount is finished, even if symptoms begin to improve quickly. Patient instructions note that stopping the medication early should only occur as directed by the prescriber.

Q: Is there a generic equivalent available for Acitab DT?

A: Yes. Regulatory records confirm that the active ingredient in Acitab DT, aciclovir, has expired patents in many regions and is widely available as a generic medicine.

Q: Does Acitab DT interact with any herbal supplements or vitamins?

A: Official guidance notes that herbal remedies and supplements are generally not subjected to the same formal testing as prescription medicines to determine interaction effects with aciclovir. The lack of testing means there is insufficient information available to determine potential interaction effects.

Q: Is there a risk of hair loss mentioned for people who use Acitab DT?

A: Official documents containing safety information list hair loss, medically termed alopecia, as a possible adverse reaction. It is generally categorized as a less common event that has been reported during the post-marketing surveillance of the medicine.

Q: Is Acitab DT used to treat herpes simplex of the eye?

A: Clinical guidelines indicate that oral aciclovir may be recommended for certain cases of herpes simplex keratitis (an eye infection). This is most often considered for patients who may be immunocompromised or whose condition does not respond well to topical treatments.

Q: Are there any listed interactions between Acitab DT and vaccines?

A: Official professional information advises generally avoiding the concurrent use of aciclovir with live, attenuated varicella virus or zoster vaccines. This caution is advised due to the potential for the medicine to diminish the immune response to the vaccine.

Q: Do official documents mention anything about resistance developing to Acitab DT over time?

A: Yes, clinical reviews and official documents confirm that aciclovir-resistant strains of the herpes simplex virus have been reported. However, the prevalence of resistance is typically observed to be low in patients with an intact or healthy immune system.

Q: Is Acitab DT considered a long-term medication for some uses?

A: For certain indications, such as chronic suppression of recurrent infections, aciclovir is authorized for use over an extended period. This may involve continuous use for up to 12 months, followed by a re-evaluation of the need for continued treatment.

Q: What are the expectations for sore healing time when using Acitab DT?

A: Studies examining the clinical outcomes of treatment indicate that when administered early, oral aciclovir may be associated with shortening the time until sores or lesions resolve by approximately one day compared to non-treatment. Official administration guidelines highlight the importance of starting treatment early.

Q: Can people who are immunocompromised use Acitab DT?

A: Official studies and clinical guidelines specifically describe the use of aciclovir for both the treatment and prevention of herpes infections in severely immunocompromised patients. Specific dosing and safety considerations are outlined for this population.

Q: How long after an outbreak should Acitab DT be started for it to be most effective?

A: Clinical guidelines consistently recommend starting oral aciclovir treatment as soon as possible after the onset of symptoms. The advice typically specifies starting preferably within 72 hours for herpes zoster (shingles) and within 96 hours for herpes simplex lesions to optimize the potential for a favorable outcome.

Q: Is it normal to have a headache when starting Acitab DT?

A: Headache is officially categorized as a common adverse reaction. This classification means it is an adverse event that has been commonly reported during clinical trials, potentially affecting up to 1 in 10 people who use the medicine.

How should Acitab DT be stored and disposed of?

How to Store and Dispose of Acitab DT?

Storing and disposing of Acitab DT must adhere strictly to the official regulatory requirements to ensure its stability and effectiveness.

Storage Requirements

Condition Requirement
Temperature Store at or below 25 C.
Protection Protect from light; store in a dry place.
Access Control Store all medicine out of reach of children.
Expiry Do not use if the expiry date on the packaging has passed.

Disposal Instructions

Official guidelines mandate a specific disposal method for unused or expired Acitab DT:

  • Return all unused medicine to your pharmacist.
  • Do not dispose of the medicine by flushing it down drains or placing it in sewerage systems.

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

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