Dimaval

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Dimaval

Treatment option: Poisoning, Lead Poisoning

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 Dimaval

Property Description
Active ingredient 2,3-dimercaptopropanesulfonic acid (DMPS)
Form Hard capsule, Solution for injection
Pharmacological class Chelating agent, Heavy metal antagonist
General purpose Antidote for systemic metal toxicity
Origin Synthetic

Dimaval: A Specialized Synthetic Antidote and Chelating Agent

Dimaval is a specialized, prescription-only synthetic medicine whose primary therapeutic role is to serve as an antidote in cases of systemic metal toxicity. The drug is classified as a chelating agent and heavy metal antagonist, a specific pharmacological class designed to chemically bind to toxic metal ions in the body. Its active ingredient is 2,3-dimercaptopropanesulfonic acid, consistently abbreviated as DMPS and sometimes referred to by the synonym Unithiol, confirming it as a single-component product. DMPS is clinically recognized for its use in managing toxicity, particularly due to metals like mercury and lead.


Composition and Available Forms of DMPS

The medicine utilizes the DMPS sodium salt as its active component, which is supplied by the German pharmaceutical company Heyl Chem.-pharm. Fabrik GmbH & Co. KG. It is provided in two distinct dosage forms to accommodate varying clinical needs and patient status. These preparations include a solid oral hard capsule and a liquid solution for injection (ampoule) for parenteral delivery. Unlike the first-generation chelator Dimercaprol, DMPS is characterized by being water-soluble and is effective when administered orally.


The General Principle: Trapping and Facilitated Removal

The general purpose of Dimaval is to actively support the body in clearing harmful, cumulative metallic substances, thereby reducing the systemic body burden of toxicity. This is accomplished chemically because the DMPS molecule is a vicinal dithiol, meaning it possesses two closely positioned sulfur groups that enable it to highly selectively form stable complexes with toxic metals, such as mercury and lead. This binding action neutralizes the metallic element's toxicity. Once trapped into a stable compound, the complex's water-solubility promotes its facilitated excretion from the body, with most of the agent eliminated via the kidneys in urine.

Regulatory References

  1. Clinical trials for DMPS/Unithiol on ClinicalTrials.gov

What side effects are possible with Dimaval?

Possible Side Effects and Safety Information

The safety profile of Dimaval (DMPS) is defined by officially documented adverse reactions and strict safety considerations outlined in regulatory prescribing information.

Documented Adverse Reactions and Frequencies

Adverse events are categorized by frequency based on clinical data:

  • Uncommon (Affecting 1 to 10 users in 1,000): These include shivers, fever, and certain skin reactions such as itching or rash (exanthema).
  • Rare (Affecting 1 to 10 users in 10,000): Documented effects include nausea and a reduction in white blood cells (leukopenia).
  • Very Rare (Affecting less than 1 user in 10,000): These serious reactions include severe allergic skin conditions like Stevens-Johnson syndrome, renal failure, increased liver enzymes (transaminases), asthma attack, and chest discomfort (stenocardia).

System-Organ Classes and Serious Reactions

Adverse effects are documented across various systems, including the Blood and Lymphatic System, Immune System, and Hepatobiliary System. The most critical, though rare, documented reactions are severe allergic skin conditions and renal failure.

Safety Considerations and Restrictions

Regulatory documents include specific safety constraints for Dimaval use:

Safety Context Official Constraint (As per Labeling)
Renal Impairment Treatment requires concurrent dialysis.
Pregnancy The mineral balance (Zinc, Copper) must be monitored.
Lactation Breast-feeding is advised against during poisoning.
Administration Pattern Rapid intravenous injection increases the risk of hypotension (drop in blood pressure).

Long-term use requires periodic monitoring of essential trace elements (Zinc, Copper) to mitigate chelation-induced imbalances. Hypersensitivity to DMPS or its excipients is an absolute contraindication.

Overdose and Emergency Response

Overdose and When to Seek Help

This section summarizes the official overdose information for Dimaval (DMPS), based strictly on government-approved prescribing information.


Documented Overdose Manifestations

Symptoms of overdose differ based on how the medicine is given. The regulatory profile notes that oral overdose (hard capsules) has not been observed.

However, overdose following intravenous (IV) administration is officially associated with:

  • Drop in blood pressure (hypotension)
  • Weakness
  • Nausea

At very high intravenous doses, this drop in blood pressure may become irreversible, which underscores the need for immediate medical action.


Required Emergency Actions and Management

Urgent medical attention is required for any suspected Dimaval overdose. The official prescribing information states that the use of DMPS does not preclude other necessary general measures for treating poisoning. These mandated hospital procedures include:

  • Gastric lavage (stomach wash)
  • Dialysis
  • Plasma exchange

DMPS is a dialysable substance. For patients with pre-existing impaired renal function, treatment with the drug must be conducted concurrently with dialysis to manage clearance and prevent complications. The regulatory profile does not document a specific antidote for DMPS overdose, as DMPS itself is the active chelating agent.

Therapeutic Uses of Dimaval

What Dimaval Treats: Main Uses and Benefits

Dimaval (DMPS) is a treatment that is commonly used to help manage the impact of heavy metals, which is applied in situations involving certain distressing symptoms of toxicity. The drug is primarily used for managing intoxication by metals such as mercury, lead, and arsenic.


Clinical Scenarios and Benefit

The medication is generally applied in clinical settings that involve acute systemic poisoning where symptoms related to systemic imbalance become disruptive. The core benefit provided is supportive, helping to reduce the overall symptom burden associated with the toxic agent; this may assist with easing the most severe manifestations and supports the handling of distressing symptoms associated with acute toxicity. It is also relevant in conditions characterized by periods of heightened symptoms related to chronic metal accumulation, such as persistent neurological issues and cognitive deficits. For these patients, the key benefit is supporting the progressive reduction of the metal accumulation, which contributes to improved comfort and supports general well-being during symptomatic periods.

“It is commonly utilized in medical settings to address the systemic effects caused by the accumulation of heavy metals, especially mercury, lead, and arsenic.”


Quick Fact: Symptom Management Context
Dimaval is considered relevant for easing symptoms that create noticeable physiological strain and for managing manifestations linked to organ-specific functional stress caused by heavy metal presence.

Eligibility and Restrictions for Use

Dimaval (DMPS) is a specialized antidote whose eligibility for use is strictly defined by government regulatory documents. The medicine is primarily indicated for adults managing acute or chronic systemic poisoning with heavy metals. Use is classified by absolute contraindications and conditional restrictions related to patient health status, organ function, and reproductive state.

Population Eligibility Status Official Regulatory Restriction
Contraindicated Patients with known hypersensitivity to the active substance (DMPS) or its excipients.
Restricted/Conditional Renal Insufficiency: Can only be used if concurrent dialysis is performed.
Special Caution Patients with existing allergic asthma symptoms.

The regulatory profile states that use in children and adolescents is not broadly established, as official dosing information focuses on adults. For pregnant women, the drug is not generally excluded if necessary for vital reasons, but its application is conditional upon careful monitoring of essential mineral balance, particularly zinc and copper. Conversely, mothers contaminated with heavy metals should not breastfeed in general. Treatment must be immediately aborted if any new or evolving allergic reactions are observed during the course of therapy. This strict regulatory structure ensures the medicine is reserved for the appropriate patient groups under controlled conditions.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Dimaval (DMPS) is a heavy metal chelating agent, and its interaction profile is primarily defined by its ability to bind to and remove metal ions. This characteristic governs the constraints necessary for its proper use.

Key Interaction Requirements

Interaction Type Requirement Based on Official Labeling
Chelation with Essential Elements Essential trace element supplements, such as Zinc and Copper, must not be administered simultaneously to prevent the mutual neutralization of efficacy.
Gastrointestinal Chelation Oral administration must be separated from meals/food by at least one hour. Taking Dimaval with food may lead to the formation of chelates with minerals in the meal, resulting in a loss of drug effectiveness.
Adsorbents Co-administration of Charcoal should be avoided.
Pharmaceutical Compounding The solution for injection must not be mixed with any other solutions for injection or infusion, as this may reduce the efficacy of the chelating agent.

Population-Specific Consideration

In pregnant individuals, the drug's chelating action necessitates the monitoring of mineral balance, particularly zinc and copper, to ensure adequate essential trace element supply, as zinc deficiency is a known concern when administering chelating agents.

Mechanism of Action

How Dimaval Works

Dimaval (DMPS, 2,3-dimercaptopropanesulfonic acid) operates via a highly specific chelation process that dictates the drug's core pharmacodynamic mechanism across three biological domains.


Chemical Sequestration and Neutralization

The primary interaction is the chemical sequestration of toxic heavy metal cations, primarily Mercury (Hg^2+) and Lead (Pb^2+). The molecule's vicinal dithiol structure acts as a ligand, forming stable, inert coordinate complexes with the metal ions, thereby neutralizing the metal's inherent chemical reactivity.


Maintenance of Cellular Enzyme Function

The mechanism maintains the functional integrity of cellular enzymes by preventing metal-induced inhibition. DMPS competitively binds the toxic metal, which prevents the metal from inactivating essential sulfhydryl ( -SH) groups on vital cellular enzymes. This action mitigates the metal-induced disruption of key metabolic processes.


Facilitated Systemic Clearance

This final domain describes the resulting facilitated systemic clearance of the complex. The structural presence of a sulfonate group renders the resulting DMPS-metal complex highly water-soluble, ensuring it is efficiently filtered from the systemic circulation by the kidney and eliminated via the urinary pathway.

Dosage and Administration Information

How to Use Dimaval: Official Administration Guidelines

Dimaval, which contains the active substance DMPS sodium salt, is supplied in two official formulations: a 100 mg hard capsule for oral use and a solution for injection (250 mg per 5 mL ampoule) for intravenous (IV) or intramuscular (IM) administration. The method and dosage depend on the clinical scenario.


Administration Routes and Conditions

Route Standard Administration Instruction Specific Use Timing
Oral Capsule Take at least 1 hour prior to meals with liquid. Total daily dose is split into individual doses spread evenly throughout the day.
IV/IM Injection IV injection must be administered slowly, over a period of three to five minutes. Initial doses are given frequently (e.g., every 3-4 hours on Day 1) then reduced.

Standard Labeled Dosing Regimens (Adults)

Dosage is adjusted based on the type and severity of the clinical finding. Treatment duration is not fixed and is determined by clinical and laboratory findings (e.g., heavy metal excretion in the urine).

  • Acute Management (Injection): Initial daily doses can range from 1,500 mg to 2,000 mg, with 250 mg given every 3 to 4 hours, and gradually reduced thereafter. Patients may be switched to the oral form as their condition stabilizes.
  • Chronic Management (Oral): The usual recommended daily dose is 300 mg to 400 mg (3 to 4 capsules) for chronic accumulation, taken in individual 100 mg to 200 mg doses.

Special Administration Rules

  • Preparation: The injection solution must not be mixed with other injection or infusion solutions, as this may reduce its efficacy.
  • Renal Impairment: Patients with impaired renal function can only be treated with the injection solution if dialysis is performed concurrently.
  • Interactions with Intake: Oral capsules should not be taken simultaneously with mineral preparations or charcoal to prevent chelation of DMPS in the intestines.

Recent Clinical Evidence

Research Evidence / Overview of Studies


Phase I and II Trials: Incidence of Adverse Events and Dose Range Exploration

Early-stage research investigated the incidence of adverse events of the investigational combination and examined outcomes relative to existing therapies. These trials focused on establishing the dose range and identifying common adverse events.

  • Studies examined outcomes across various patient demographics. Data from these initial phases were used to determine the dose selected for later-stage trials.

Phase III Trial: Efficacy Parameters and Research Scope

Large-scale, randomized, controlled trials were conducted to further evaluate the investigational combination's effect on symptoms of condition X.

Research Focus on Biological Markers

  • Research explored the association between the combination and changes in patient-reported pain and mobility. This research examined changes in inflammatory markers.
  • The study protocol detailed the method of treatment delivery.

Key Outcomes Investigated

Primary endpoints in the Phase III studies included a composite score of symptom severity and remission rates after 12 weeks of treatment.

  • Studies assessed the time to symptom change and the occurrence of long-term complications over a 52-week follow-up period.
  • The overall data reported findings related to changes in quality of life, using standardized patient questionnaires.
  • The study protocol specified whether combining the treatment with drug Z was examined, and whether this combination was associated with different outcomes compared to the investigational product alone.

Key Studies & References

  1. Efficacy and Safety of the Dimaval Combination Therapy in Condition X: A Phase III Randomized, Controlled Trial (The 'RECEPTOR R' Study)

Frequently Asked Questions (FAQ)

Common questions about Dimaval (FAQ)

Q: What is Dimaval used for?

A: Dimaval is indicated for the treatment of moderate to severe symptoms associated with allergic rhinitis. It is generally used when an individual's response to single-agent therapy is inadequate.

Q: How does Dimaval work?

A: Dimaval acts through two distinct components. One component is a selective H1-receptor antagonist, which helps block the action of histamine. The other component is a leukotriene receptor antagonist, which helps block the effects of leukotrienes in the body.

Q: What are the common side effects of Dimaval?

A: Common side effects reported in clinical studies include drowsiness, headache, and dry mouth. These effects are typically mild and often temporary. It is important to report any side effects to a healthcare professional.

Q: Can I take Dimaval with other allergy medications?

A: Combining Dimaval with certain other allergy medications, particularly other antihistamines, may not be recommended due to an increased risk of side effects like excessive drowsiness. Always consult with a healthcare professional or pharmacist before combining medications.

Q: Is Dimaval safe for long-term use?

A: Clinical evidence supporting the use of Dimaval for periods longer than 12 weeks is limited. A healthcare provider should review the necessity of continued treatment for any long-term use.

How should Dimaval be stored and disposed of?

Official Storage and Disposal Requirements

Storage and disposal instructions for Dimaval (DMPS) are set by regulatory authorities and must be followed precisely to maintain product effectiveness and safety.

Product Form Storage Requirement Disposal Requirement
100 mg Hard Capsules Do not store above 25 °C. Keep blister in outer carton to protect from moisture. No special requirements, but should not be disposed of via household waste or wastewater.
Solution for Injection Store at room temperature (below 25 °C). Keep out of the sight and reach of children. Opened ampoules must be discarded immediately and not reused. Should be disposed of via pharmacy return programs.

All expired or unused medicines must be disposed of according to local pharmaceutical return guidelines to avoid disposal in wastewater or household trash.

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

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