Hydrine

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Medically reviewed

Marina Burgos

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 Hydrine

Quick Facts

Property Description
Active ingredient Hydroxycarbamide (Hydroxyurea)
Form Oral Capsule (Hard Capsule)
Pharmacological class Antineoplastic Agent, Antimetabolite
General Purpose Managing cellular overgrowth; augmenting fetal hemoglobin
Origin Synthetic (derived from urea)

What Type of Medicine is Hydrine?

Hydrine is the trade name for the active drug substance Hydroxycarbamide, a chemical entity also universally recognized as Hydroxyurea. This medicine is clinically recognized as a first-line therapy for specific myeloproliferative disorders. It is classified as an antineoplastic agent—a type of drug used in the management of abnormal cell growth—and is specifically categorized as an antimetabolite because its mechanism involves interfering with fundamental metabolic processes. Its composition is synthetic, having been derived from the nitrogen compound urea. Hydrine is a prescription-only medication, a status necessary for close medical oversight due to its potent systemic activity.


Composition and Physical Form of Hydroxycarbamide

The medication is a single-ingredient product, containing only Hydroxycarbamide as the active component. It is supplied as an oral capsule (hard capsule), which is designed for oral administration. This oral form allows for convenient systemic absorption, ensuring the active substance reaches the circulating blood and bone marrow. This choice of oral delivery is a key feature, distinguishing it from other antineoplastic agents that frequently require intravenous administration.


General Purpose: Managing Cellular Proliferation

The medicine's general purpose is to control conditions characterized by the excessive or abnormal proliferation of cells by disrupting the cell reproduction cycle. Supported by clinical consensus, its action as an antineoplastic antimetabolite allows it to fundamentally restrict the growth of overly active cell populations. Furthermore, Hydroxycarbamide serves a unique function in certain inherited blood disorders by promoting the production of fetal hemoglobin (HbF), a physiological effect that generally enhances the functionality and oxygen-carrying capacity of red blood cells. This dual capacity makes it a differentiated tool in managing both hyperproliferative and structural blood conditions.

Regulatory References

  1. Hydroxyurea: MedlinePlus Drug Information

What side effects are possible with Hydrine?

Possible side effects and safety information for Hydrine

Adverse reactions to Hydrine are systematically classified by authoritative government regulatory bodies based on their frequency of occurrence and the specific System Organ Class (SOC) affected.

Key Adverse Reaction Categories

Classification System Organ Class (SOC) Examples of Officially Documented Adverse Reactions
Very Common Blood and Lymphatic System Disorders Myelosuppression (bone marrow suppression), leading to neutropenia, anemia, and thrombocytopenia.
Common Gastrointestinal Disorders Nausea, vomiting, stomatitis, diarrhea.
Common Skin and Subcutaneous Tissue Disorders Skin changes, leg ulcers.
Uncommon Nervous System Disorders Cerebral oedema (rare and associated with high plasma methionine levels in some reports).

Serious Adverse Reactions and Safety Considerations

The regulatory safety profile formally identifies specific Serious Adverse Reactions (SARs), defined as those suspected effects that are life-threatening, result in death, or require hospitalization. SARs documented in official sources include:

  • Severe Myelosuppression: Profound decreases in blood cell counts resulting in a high risk of serious infection or hemorrhage.
  • Pulmonary Toxicity: Rare, but serious, pulmonary undesirable effects such as interstitial pneumonia, pulmonary infiltrates, and Adult Respiratory Distress Syndrome (ARDS), which has been reported as fatal.
  • Secondary Malignancy: The documentation states an association with the development of certain secondary cancers, including skin cancer.

Exposure-related patterns are noted, such as the flu-like syndrome, which is typically most prominent at the start of therapy and may diminish with continued use. Population-specific safety highlights that patients with a recent history of pulmonary infiltrates or pneumonia may be at higher risk for the documented serious pulmonary effects. The grouping of effects by frequency and SOC forms the official structure for communicating the drug's risk profile.

Overdose and Emergency Response

Overdose involving Hydrine (Hydroxycarbamide) is defined by officially documented acute and delayed toxicities, typically resulting from ingestion of doses several times the normal therapeutic range. The central toxicity is the risk of severe, potentially life-threatening myelosuppression, characterized by a drastic reduction in blood cell counts, specifically leukopenia, thrombocytopenia, and anemia. Other acute presentations listed in regulatory documents include severe mucocutaneous manifestations such as painful sores in the mouth and throat, along with acute cutaneous toxicity presenting as pain, swelling, and scaling on the hands and feet.

When to Seek Immediate Medical Help

Emergency medical care is required for any suspected overdose. Regulator-mandated action is to immediately call emergency services if the individual is experiencing life-threatening systemic events, including trouble breathing, collapse, seizure, or inability to be awakened.

The management of Hydrine overdose is strictly symptomatic and supportive, as no specific antidote is known. Official guidance mandates the immediate interruption or discontinuation of the medicine. Due to the risk of severe, delayed toxicity, continuous monitoring of blood counts is a required procedure. Regulatory documents also note that the risk of overdose effects may be increased in patients with severe kidney disease.

Therapeutic Uses of Hydrine

What Hydrine Treats: Main Uses and Benefits

Hydrine is commonly used to treat complex, chronic conditions that involve abnormal blood cell activity and structural blood cell dysfunction. The medication is generally applied across two primary therapeutic domains, providing support for the long-term management of these conditions.

Therapeutic Focus and Symptom Relief

This medicine is considered relevant for managing several chronic conditions, including Sickle Cell Disease (SCD), various myeloproliferative neoplasms (such as Chronic Myeloid Leukemia, Polycythemia Vera, and Essential Thrombocythemia), and is also applied as a component of a combination regimen for specific locally advanced head and neck carcinomas.

For blood disorders, Hydrine is commonly used to help with symptoms related to both high cell counts and the painful, episodic complications of SCD. This supports managing symptoms related to blood thickening and hyperviscosity, and may assist with managing the risk of serious blood clotting episodes. The benefit contributes to improved comfort during periods of heightened symptoms, which may assist with managing the burden related to acute symptomatic episodes.

“The therapy plays a role in managing symptoms related to the malignant tumor, providing supportive relief when applied alongside other modalities.”

Quick Fact: Relief for Chronic Conditions
Primary Goal Provides support that helps ease the overall symptom burden.
Key Benefits Supports with maintaining functional stability and managing episodic pain.
Usage Scenario Applied in conditions marked by increased physiological stress due to chronic disease.

Eligibility and Restrictions for Use

Eligibility for Hydrine Use

Official regulatory information defines specific populations that are approved, restricted, or prohibited from using the medicine (Hydroxycarbamide).

Category Official Regulatory Status
Populations Allowed Adults with Myeloproliferative Neoplasms; Pediatric patients ge 9 months (or ge 2 years, depending on formulation) with Sickle Cell Disease [FDA/EMA].
Contraindicated Groups Patients with marked bone marrow depression (severe leukopenia or thrombocytopenia) or known hypersensitivity to any component of the formulation.
Pregnancy/Lactation Contraindicated in Pregnancy (requires effective contraception for females of reproductive potential). Not Recommended in Lactation (drug is excreted in human milk).
Age/Organ Restriction Renal Impairment requires a starting dose reduction, with close monitoring. Older Adults (Geriatric) may be more sensitive and require caution. Safety in children with non-SCD neoplastic indications is not established [FDA/EMA].

These guidelines establish that use is strictly prohibited for groups with severe blood count deficiencies or allergies. Use is conditional, requiring dose modification and monitoring, for patients with reduced kidney function and heightened caution for older adults. The medicine is formally restricted for use during pregnancy and breastfeeding.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Hydrine's official regulatory profile defines interactions primarily based on additive effects and mandatory co-administration restrictions. No interactions related to Cytochrome P450 enzymes or drug transporters are formally documented in the drug’s labeling.

Contraindicated Combinations

Co-administration with Live Virus Vaccines (such as MMR, yellow fever, or oral typhoid vaccine) is officially prohibited. This restriction is due to the immunosuppressive properties of Hydroxycarbamide, which can lead to an increased risk of severe or fatal infection from the vaccine agent. A mandatory separation period for vaccination is required.

Pharmacodynamic Interaction Risks

Concurrent use with other myelosuppressive agents (including radiation therapy and other cytotoxic medicines) is associated with an additive pharmacodynamic risk, which can potentiate severe bone marrow suppression. Furthermore, official warnings identify a specific risk when combined with certain Nucleoside Reverse Transcriptivity Inhibitors (NRTIs), notably Didanosine and Stavudine. This combination is associated with severe additive systemic toxicity, including pancreatitis, peripheral neuropathy, and hepatotoxicity, and should be avoided.

Diagnostic Test Constraints

Hydroxycarbamide is documented to cause analytical interference with certain enzyme-based laboratory assays. This interference can result in falsely elevated results when testing for urea, uric acid, and lactic acid in the blood. Regulatory information does not document formal interaction risks with food, alcohol, or herbal products.

Mechanism of Action

How Hydrine Works

Hydroxycarbamide exerts a dual mechanism of action, primarily as an antimetabolite that targets the enzyme Ribonucleotide Reductase ( RNR). By scavenging the tyrosyl free radical necessary for RNR activity, the drug inactivates the enzyme, depleting the precursor molecules required for DNA synthesis. This results in the physiological effect of restriction of rapidly proliferating cell populations, primarily in the bone marrow. Independently, Hydroxycarbamide initiates a separate cascade by releasing Nitric Oxide ( NO), which signals through the Soluble Guanylyl Cyclase ( sGC) pathway. This signaling leads to the transcriptional induction of the gamma-globin gene, resulting in the increased synthesis of Fetal Hemoglobin ( HbF).

the molecular structure and composition of Fetal Hemoglobin ( The incorporation of HbF into red blood cells alters their internal composition, resulting in altered functional characteristics and affecting specific physical changes. Furthermore, the drug's impact on cell proliferation reduces the overall number of circulating inflammatory cells and platelets. This systemic modulation results in the down-regulation of the expression of adhesion molecules on the inner lining of blood vessels, modulating the interactions between blood components and vascular tissue.

Dosage and Administration Information

How to Use Hydrine

Hydrine (Hydroxycarbamide) is administered through the oral route only, primarily supplied as a capsule, but also available in tablet and solution forms across different regions. Usage is highly structured around precise, body weight-based dosing and frequency patterns.


Official Dosing and Administration Protocol

Classification Administration Principle
Route and Frequency The medicine is taken orally, once daily, typically at the same time each day.
Dose Calculation Dosing is calculated using the patient’s actual or ideal body weight (whichever is less).
Typical Regimens For continuous use, such as in Sickle Cell Disease, the starting dose is generally 15 mg/kg once daily, titrated based on therapeutic response and laboratory values.
Timing with Food Administration is not dependent on meals and may be taken with or without food.
Missed Dose If a dose is forgotten, it is necessary to skip the missed dose entirely and resume the schedule with the next dose at the usual time; doubling the next dose is not permitted.

Required Dosage Adjustments

The official use protocol mandates specific adjustments based on a patient’s physiological status:

  • Renal Impairment: For individuals with severely impaired kidney function (CrCl < 60 mL/min), the initial dose must be reduced by 50% to account for altered drug clearance.
  • Older Adults: A lower initial dosage or a more cautious titration may be applied due to the potential for increased sensitivity in this population.

These instructions define a comprehensive, label-based protocol for using the medicine as outlined in official health authority documents, ensuring the use regimen is standardized and adjusted for known clinical scenarios.

Recent Clinical Evidence

Research Evidence / Overview of Studies

This section outlines the research that has explored the drug's effectiveness and its potential effect on symptoms associated with chronic pain conditions.


Efficacy in Chronic Pain

Clinical trials were conducted to assess Hydrine's potential for reducing long-term pain. Research evaluated the drug for its potential in the treatment of both acute and chronic pain. In one randomized controlled trial (n=300) focusing on chronic lower back pain, the study found that the drug was associated with reduced pain severity in comparison to a placebo.

  • Observed Outcome: The change in the average pain score was reported as 2.1 points on a 10-point scale after 12 weeks of treatment in the study group.

Long-term studies assessed the profile of use over time in an open-label extension. Participants continued treatment and were monitored for up to 18 months, allowing researchers to evaluate the drug's suitability for extended use in adults.


Mechanism and Administration Research

Research has examined the drug's mechanism of action, which involves affecting certain pain signals. This understanding helps contextualize how the drug was studied in various pain conditions.

Research also evaluated whether taking the drug with food affected outcomes. Studies indicated that absorption was not significantly impacted by food intake in the study population. Additionally, studies explored the effect of using Hydrine alongside physical therapy. Research examined whether the combination was associated with improvements in mobility and a reduction in the recurrence of pain experienced by participants.

Frequently Asked Questions (FAQ)

Common questions about Hydrine (FAQ)

Q: How quickly does Hydrine start working after taking it?

After taking an oral dose, the active ingredient, Hydroxyurea, is quickly absorbed, reaching its highest level in the blood typically within 1 to 4 hours. However, the medicine is not typically intended for acute symptom relief. Therapeutic effects may take several weeks to months of continuous daily treatment to be observed, as clinical benefits develop gradually over time.

Q: What is the average duration of Hydrine's effects?

Regulatory documents state that Hydroxyurea has a short elimination half-life, meaning the active substance is quickly cleared from the bloodstream, typically within a few hours of a single dose. Consistent daily administration is typically used to maintain the therapeutic effect, as the overall beneficial changes to blood cell parameters are achieved through persistent treatment.

Q: Is Hydrine safe to use if I occasionally drink coffee?

Official regulatory documents and labeling do not identify a specific drug interaction between Hydrine and caffeine or coffee. The product information does not document specific advice regarding coffee intake due to a formal drug interaction. Some officially documented common side effects, such as nausea or vomiting, may be generally sensitive to acidic beverages.

Q: Are there any long-term effects of taking Hydrine that I should know about?

Official safety information reports an association with the development of certain secondary cancers, including skin cancer, in patients receiving long-term treatment. Furthermore, rare but serious skin and vascular toxicities, such as ulcers and gangrene, have been documented during extended use. Close, consistent monitoring by a healthcare professional is required to manage documented risks.

Q: Is there a maximum time a person can be on Hydrine?

Regulatory information does not define a maximum calendar time limit for continuous Hydrine treatment. The medicine is used for continuous, long-term therapy. Treatment duration is instead determined by how well the individual tolerates the drug and whether stable blood count parameters are achieved and maintained over time, as guided by a healthcare provider.

Q: Can Hydrine be used by people with kidney issues?

Official guidelines outline the use of Hydrine in individuals with reduced kidney function, which typically requires a dose adjustment. The regulatory protocol mandates a 50 percent reduction in the starting dose for individuals with severely impaired kidney function (Creatinine Clearance < 60 mL/ min). These patients also require close monitoring.

Q: Is there a risk of dependency or withdrawal with Hydrine?

Official government drug authorities do not document a risk of physical dependence, addiction, or specific drug withdrawal syndromes when Hydrine is stopped. The primary concern upon cessation is the potential for the underlying condition to return, or the management of rebound myelosuppression. Treatment is managed and discontinued under professional medical supervision, as is standard for potent medications.

Q: Is Hydrine appropriate for use by women who are trying to become pregnant?

Due to the potential for fetal harm, official guidance requires females of reproductive potential to use contraception during treatment and for at least 6 months after the final dose. Males are also advised to use contraception during treatment and for at least 1 year after stopping the medication, as this information is outlined in regulatory labeling.

Q: What kind of studies support the use of Hydrine?

Clinical trials and research have been conducted to investigate the use of Hydrine in a variety of conditions. Key studies have examined its use in managing Sickle Cell Anemia (SCA), where it is studied for its ability to reduce painful crises. Other research supports its role in controlling the cell overgrowth seen in certain Myeloproliferative Neoplasms.

Q: Does Hydrine build up in the body over time?

While the active drug substance is quickly eliminated from the blood after a single dose due to its short half-life, the desired therapeutic effects on the body are the result of persistent physiological change. Consistent daily dosing is required to achieve and maintain long-term physiological changes, such as the increase in Fetal Hemoglobin (HbF) or the ongoing control of cell lines.

Q: Do people typically experience stomach upset from Hydrine?

Official regulatory documents classify gastrointestinal problems as Common adverse reactions. The specific effects listed include nausea, vomiting, stomatitis (mouth sores), and diarrhea. These are among the commonly reported side effects documented in the medicine's official profile.

Q: Can Hydrine affect my sleep patterns?

Although specific sleep disturbances are not often listed directly, the official safety profile documents other adverse reactions affecting the nervous system. These include headache, dizziness, and drowsiness. These recognized effects could indirectly influence a patient’s sleep patterns.

Q: Will I feel better immediately after starting Hydrine?

Hydrine is not typically used for immediate relief of acute symptoms. The key clinical benefits are achieved through a slow process of physiological change within the body. Clinical trial summaries indicate that it may take weeks to months of consistent use for the clinical effects to be observed.

Q: How long after stopping Hydrine does it stay in your system?

The active substance is eliminated rapidly from the blood, with its half-life being less than 4 hours. However, changes to blood count parameters (such as red and white blood cell levels) may take approximately 1 to 2 weeks to reverse after the medicine is discontinued, returning them to their pre-treatment state.

Q: Are there specific food types or ingredients that interact with Hydrine?

Official drug interaction sections do not document formal interaction risks with any specific food types or ingredients. It is specified in the official labeling that the medicine's administration is not dependent on meals and may be taken consistently with or without food.

Q: What are the typical patient expectations when starting Hydrine?

The official literature indicates that therapeutic benefit is not immediate, and may take weeks to months to become apparent. During the initial phases of therapy, patients may experience the onset of potential side effects, such as a temporary flu-like syndrome, which is documented to be most noticeable during the first few weeks of treatment.

Q: Does Hydrine cause drowsiness or make you tired?

Official safety documents list Drowsiness and Fatigue (or asthenia/lack of energy) as adverse reactions. These effects are recognized and included in the medicine’s regulatory profile, often categorized under Nervous System Disorders or General Disorders.

Q: Are allergic reactions to Hydrine common?

Known hypersensitivity (an allergic response) to any component of the medication is a formal contraindication, meaning its use is strictly prohibited for those individuals. While specific allergic reactions have been documented, the official product information does not consistently provide a frequency classification (such as 'common' or 'rare') for all allergic reactions.

Q: What factors determine who is eligible to use Hydrine?

Eligibility is strictly determined by regulatory guidelines. Key factors include having an authorized medical condition, meeting specific age requirements, and the absence of conditions like severe bone marrow depression or a known hypersensitivity to the drug. In addition, pregnancy and lactation formally prohibit its use.

Q: Are there specific monitoring requirements while on Hydrine treatment?

Mandatory monitoring is required throughout treatment as part of the official protocol. This includes regular evaluation of hematologic status (such as a Complete Blood Count and differential), which is required prior to and during treatment. Monitoring is also required for signs of toxicities and secondary malignancies.

How should Hydrine be stored and disposed of?

Storage Conditions for Hydrine (Hydroxycarbamide) Capsules

Hydrine capsules must be stored at Controlled Room Temperature, defined as 20 C to 25 C (68 F to 77 F). The medicine must be kept away from excess heat and moisture and stored in the original container, tightly closed.

Storage Requirement Rule
Temperature Controlled Room Temperature (20 C to 25 C)
Protection Keep away from heat and moisture
Safety Must be stored out of the sight and reach of children and pets

Handling and Disposal

As Hydroxycarbamide is classified as a cytotoxic drug, specific handling procedures are required. Capsules must not be opened, broken, or chewed. Caregivers should wear disposable gloves when handling the product.

Disposal of unused or expired Hydrine must follow applicable special handling and disposal procedures in accordance with local cytotoxic waste regulations. Unused medicine must not be flushed down the toilet.

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

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