Eisensulfat

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Eisensulfat

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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 Eisensulfat

What is Eisensulfat?

Eisensulfat, known in English as ferrous sulfate, is a chemical compound consisting of iron and sulfur. It is a type of iron salt that is widely used as a mineral supplement. In the context of human health, it serves as a source of elemental iron, which is a vital micronutrient required for various biological functions.

Role in the Body

Iron is a primary component of hemoglobin, the protein in red blood cells responsible for transporting oxygen from the lungs to the rest of the body. It is also a key element of myoglobin, a protein that provides oxygen to muscles, and it supports the function of several enzymes and the immune system.

Mechanism of Action

When the body does not have enough iron, it cannot produce sufficient healthy red blood cells, leading to a state where tissues do not receive adequate oxygen. Eisensulfat works by replenishing the iron stores in the body. Once ingested, the iron is absorbed primarily in the duodenum and proximal jejunum of the small intestine. From there, it enters the bloodstream and is transported to the bone marrow for the production of new red blood cells or stored in the liver, spleen, and bone marrow as ferritin or hemosiderin.

Characteristics

Eisensulfat is typically found in various oral forms, such as tablets, capsules, or liquid drops. It is recognized for its effectiveness in increasing iron levels in the blood due to its high solubility and relatively high elemental iron content compared to some other iron salts.

Regulatory References

  1. National Institutes of Health (NIH)
  2. NIH Fact Sheet on Iron

What side effects are possible with Eisensulfat?

Possible Side Effects and Safety Information

The officially documented safety profile for Eisensulfat (Ferrous Sulfate), an oral iron supplement, is defined by regulatory agencies based on frequency classification and specific safety warnings, primarily affecting the digestive system.


Frequency-Classified Adverse Reactions

The most commonly listed adverse events relate to gastrointestinal tolerability. According to regulatory documents, effects are classified based on their observed frequency:

Classification Examples of Adverse Reactions
Common Nausea, constipation, diarrhea, abdominal discomfort/pain
Uncommon Heartburn, vomiting
Not Known Severe allergic reactions (hypersensitivity)

These gastrointestinal effects are often documented as being more common at the start of treatment or during a period of dose escalation.


Safety Constraints and Serious Reactions

The regulatory label includes specific warnings about rare but serious outcomes, as well as necessary restrictions on use:

  • Serious Adverse Reactions: The primary serious risk documented is acute iron poisoning (overdose), which is considered potentially fatal, especially in the pediatric population. Other serious documented risks include gastrointestinal ulceration and rare cases of anaphylactic reaction.
  • Safety Restrictions: Eisensulfat is contraindicated in patients with conditions involving an iron overload syndrome (e.g., hemochromatosis, hemosiderosis) or certain forms of anemia not caused by iron deficiency.
  • Population Notes: Regulatory documents include specific warnings about the high risk of accidental overdose in young children and note caution for patients with a history of gastrointestinal ulcers or inflammatory bowel disease.

This framework ensures that high-risk scenarios and patient-specific constraints are formally communicated as essential components of the drug's safety profile.

Overdose and Emergency Response

Overdose with Ferrous Sulfate is officially classified as a medical emergency due to the potential for rapid progression to life-threatening complications. Regulatory documents state that accidental overdose is a leading cause of fatal poisoning in young children, creating a critical need for urgent care.

Documented Manifestations and Severe Outcomes

Initial manifestations of overdose are strictly documented as severe gastrointestinal toxicity, including vomiting, severe abdominal pain, and bloody diarrhea. This is often followed by systemic effects such as hypotension (low blood pressure), tachycardia, and the onset of metabolic acidosis. Overdosage may rapidly escalate to severe outcomes, including shock, cardiovascular collapse, multi-organ failure, and the potential for late-phase hepatic or renal damage.

Regulator-Mandated Emergency Response

Immediate emergency medical attention or contact with a Poison Control Center must be sought for any suspected overdose or accidental ingestion, as explicitly stated in prescribing information. The official management protocol involves supportive care and the use of the specific iron chelating agent, Desferrioxamine. Monitoring requirements in the hospital setting include the serial measurement of serum iron levels and diagnostic procedures such as an abdominal X-ray.

Therapeutic Uses of Eisensulfat

What Eisensulfat Treats: Main Uses and Benefits

Ferrous sulfate is commonly used across conditions presenting with acute episodes of iron deficiency where additional symptomatic support is needed. Its use is relevant when supportive symptom management is appropriate for conditions where symptoms may intensify temporarily in situations where patients experience these symptoms. Iron supplementation is indicated for iron-deficient states and aims to provide symptomatic relief.

It is commonly used to help with symptoms associated with these conditions, including symptoms related to systemic imbalance, physical discomfort, and those that interfere with daily comfort.


Easing Symptom Burden and Supporting Stability

Eisensulfat is applied across domains where additional symptomatic support is needed for symptoms related to systemic imbalance, such as tiredness and general weakness. It helps address symptom clusters that may become intense or disruptive. This treatment is often used during phases when symptoms become more noticeable and may help patients cope more steadily with symptom fluctuations.

“It provides support that helps ease the overall symptom burden, supports patients during episodes of heightened discomfort.”


Quick Fact: Support for Tiredness and Weakness

Eisensulfat may assist with managing symptoms that create noticeable physiological strain, supporting general well-being during symptomatic phases.

Regulatory References

  1. Iron Supplementation - StatPearls - NCBI Bookshelf - NIH

Eligibility and Restrictions for Use

Eligibility Map: Official Regulatory Information

The eligibility for using Ferrous Sulfate (Eisensulfat) is strictly defined by regulatory bodies based on a patient's iron status, age, and pre-existing medical conditions.

Populations for Whom Use is Contraindicated: Use is prohibited for patients with conditions involving iron overload, such as hemochromatosis or hemosiderosis, and those receiving frequent blood transfusions [Source: 1.1, 1.2]. It is also contraindicated for patients with anemias not caused by iron deficiency (e.g., hemolytic anemia, sideroblastic anemia) unless a concurrent iron deficiency is proven [Source: 1.1, 1.3]. Absolute contraindications include known hypersensitivity to the ingredient and active peptic ulceration or ulcerative colitis [Source: 1.1, 1.3].

Age-Related Eligibility and Restrictions: Ferrous Sulfate is generally approved for use in adults and adolescents. For the pediatric population, specific solid oral formulations are often not recommended or are contraindicated for young children (e.g., under 6 or 12 years, depending on the product) due to the serious risk of accidental fatal overdose [Source: 1.6, 2.1]. Older adults may be treated, but some formulations require caution due to swallowing difficulties [Source: 2.1, 2.4].

Pregnancy and Lactation Eligibility: Use is permitted during pregnancy and lactation when a medical need for iron supplementation (such as documented iron deficiency or anemia) is established [Source: 3.1, 3.2].

Eligibility-Related Restrictions: Use requires caution in patients with chronic inflammatory gastrointestinal diseases, intestinal strictures, or diverticulae [Source: 1.1, 2.4].

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information for Eisensulfat (Ferrous Sulfate) documents a structure of interactions predominantly focused on pharmacokinetic interference and mandated timing separation, strictly sourced from government authorities.

Documented Interaction Patterns

Interaction Type Interacting Substances/Products Official Outcome/Restriction
Contraindicated Combinations Parenteral Iron Preparations Must not be used concomitantly
Dimercaprol Co-administration is to be avoided
Reduced Absorption (PK) Tetracycline and Quinolone Antibiotics, L-Thyroxine, Bisphosphonates, Penicillamine, Levodopa/Methyldopa, Antacids, Cholestyramine Reduces the absorption and exposure of the co-administered drug
Enhanced Absorption (PD/PK) Ascorbic Acid (Vitamin C) Increases iron absorption

Mandatory Timing and Substance Restrictions

Several combinations require mandated timing separation to mitigate the reduced absorption. Doses of Tetracycline Antibiotics and L-Thyroxine must be separated from Eisensulfat by at least two hours. Similarly, Antacids and Cholestyramine require a separation interval of one to two hours. Regulatory documents advise separating the intake of Eisensulfat from milk, tea, coffee, eggs, and whole grains as these foods may impair oral iron absorption. Furthermore, consumption of alcohol is officially associated with an increased risk of iron toxicity due to enhanced absorption and hepatic storage.

Mechanism of Action

Eisensulfat, providing Fe^2+ (ferrous) ions, acts primarily as a source for systemic iron repletion. The ferrous ions are targeted for absorption primarily in the duodenum and proximal jejunum of the gastrointestinal tract.

Molecular and Cellular Pathways

Absorption into intestinal enterocytes is mediated by Divalent Metal Transporter 1 (DMT1), which actively transports the Fe^2+ ions across the apical membrane. Inside the enterocyte, iron is either sequestered into storage as ferritin or exported into the portal circulation via the basolateral efflux protein ferroportin.

Downstream Cascades and Physiological Consequences

Upon export, the Fe^2+ ion is oxidized to Fe^3+ (ferric) by an enzyme like hephaestin (in the gut) or ceruloplasmin (in the plasma), allowing it to bind to the transport protein transferrin. The Fe^3+-transferrin complex is then distributed systemically, with selective accumulation in the bone marrow and liver.

In the bone marrow, transferrin receptors facilitate cellular iron uptake. The Fe^2+ is incorporated into the heme molecule via the action of ferrochelatase, a crucial step in the synthesis of hemoglobin. System-level modulation results in increased iron availability for incorporation into essential respiratory enzymes, myoglobin, and the formation of new erythrocytes.

Dosage and Administration Information

How to Use Ferrous Sulfate (Eisensulfat)

The usage of Ferrous Sulfate is governed by guidelines establishing the appropriate route, dose, frequency, and duration of therapy to ensure correct administration. The medicine is exclusively taken orally, available in dosage forms such as tablets, modified-release tablets, and oral solutions.

Official Administration Guidelines

Feature Guideline
Dosing schedule (Adults) Treatment typically requires 100–200 mg elemental iron per day, often prescribed as one 325 mg Ferrous Sulfate tablet (65 mg elemental Fe) taken two to three times daily. Prophylaxis often involves a lower, once-daily dose of 60 to 65 mg elemental iron.
Timing in relation to meals Optimal absorption occurs when taken on an empty stomach. If gastrointestinal discomfort occurs, the dose may be taken with or after food for better tolerance.
Special procedural conditions Tablets must be swallowed whole with water; they should not be sucked, chewed, or crushed, especially modified-release forms. To ensure maximal uptake, the medicine should not be taken within two hours of antacids, calcium supplements, or absorption-inhibiting substances like coffee or tea.
Age-group administration Pediatric dosing is individualized and calculated based on the child's age, body weight, and specific blood parameters.

Course Duration and Use Protocol

The total duration of use for Ferrous Sulfate is typically several months. Guidelines specify that therapy should continue for three to six months after blood levels (hemoglobin) have normalized to ensure the body's iron stores are fully replenished. The use protocol dictates a sustained regimen, often administered in divided daily doses, to achieve this long-term repletion.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Eisensulfat

Evidence for Use in Iron Deficiency Anemia (IDA) & Correction of Iron Deficiency (ID)

The primary research for Eisensulfat (Ferrous Sulfate) involves Randomized Controlled Trials (RCTs) summarized in Systematic Reviews and Meta-analyses. These studies monitor shifts in core hematological biomarkers, such as Hemoglobin and Serum Ferritin levels, to track measurements of blood status and mineral stores in the general adult population and in children. The research describes how Ferrous Sulfate has historically been used as a comparator in many studies of oral iron administration.

What remains unclear is the long-term sustainability of these findings. Follow-up durations were limited in many studies, focusing mainly on the acute correction phase of three to six months. Long-term effects are not fully established regarding the durability of iron store repletion. The influence of poor patient adherence on the observed changes in iron status in real-world settings is a consistent limitation in the literature.

Evidence for Prophylaxis and Treatment in Pregnancy

Research examining the use of Eisensulfat during pregnancy relies on a substantial body of RCTs and large Observational Studies. These studies focus on specific outcomes related to maternal iron status and neonatal outcomes, such as low birth weight. The research tracks how blood measures evolved in the observed pregnant populations and documents that Ferrous Sulfate was studied for the purpose of addressing iron status during this time. Evidence for prevention (prophylaxis) is subject to variability and heterogeneity when comparing the findings of different studies.

Evidence in Specific Patient Populations

Eisensulfat was evaluated in patient groups beyond the general adult population. For example, specific RCTs and pooled analyses were observed in children (infants to adolescents). Research also examined use in certain subgroups like patients with Chronic Kidney Disease. However, the evidence quality varies across studies when examining these specific populations, and subgroup findings are uncertain compared to the robust data in the general population.

What is Still Uncertain About the Research

Research contributes to the broader evidence landscape, but certainty remains low in several areas. The persistent issue of poor patient non-adherence documented in studies makes it challenging to draw clear conclusions about data in real-world settings. Furthermore, comparative evidence is lacking for certain long-term outcomes reflecting daily functioning or activity level, and research does not determine whether an individual will respond similarly to the group patterns observed in the clinical studies.

Key Studies & References

  1. Iron Supplementation - StatPearls (General Clinical Review)

Frequently Asked Questions (FAQ)

Common questions about Eisensulfat (FAQ)

Q: Can Eisensulfat cause nausea, and if so, what typically helps reduce this side effect?

Gastrointestinal effects like nausea are commonly reported side effects, particularly when initiating treatment. Official guidance indicates that if this discomfort occurs, the medicine's tolerability is often improved when taken with or immediately after food. This change in timing is often noted to improve the medicine's tolerability.


Q: Are there any long-term safety concerns associated with taking Eisensulfat for several months?

Official guidelines indicate that the full course of treatment typically lasts for three to six months after blood levels have returned to normal to replenish iron stores. Continued use beyond this prescribed duration is not typically supported by regulatory indications, and the official label notes a serious risk of iron accumulation or toxicity.


Q: Are there special precautions for taking liquid forms of Eisensulfat?

When taking the oral solution, regulatory information details measures that may be used to minimize temporary tooth discolouration, such as placing the liquid on the back of the tongue using a dropper or straw. Good dental hygiene is also referenced in association with its use.


Q: What is the difference between iron deficiency and iron-deficiency anemia in the context of treatment?

Ferrous sulfate is officially indicated for both the treatment of Iron Deficiency Anemia (IDA) and the correction or prevention of Iron Deficiency (ID). Anemia refers to a low count of red blood cells, while deficiency refers to low iron stores in the body. The dose and duration of therapy are determined by a medical professional based on the specific status of iron stores and blood parameters, implying a clinical difference in the treatment goal for each condition.


Q: Is Eisensulfat available in slow-release or extended-release formulations, and what is the claimed benefit?

Ferrous sulfate is available in modified-release tablets, which are designed to release the active ingredient slowly over time. Official administration guidelines state that these dosage forms are intended to be swallowed whole with water, and should not be sucked, chewed, or crushed. This restriction is important because the tablet is designed to release the ingredient slowly over time.


Q: Can Eisensulfat be used to help increase energy levels if the person is not diagnosed with iron deficiency?

The medicine is primarily indicated by regulatory documents for correcting documented iron deficiency, as this mineral is crucial for synthesizing hemoglobin and supporting the body's essential oxygen transport system. Using it for general energy without a medical need is not supported by its primary indication. Efficacy for general energy enhancement is uncertain.


Q: Can taking Eisensulfat impact a person's diet or need for dietary iron intake?

Regulatory information documents that certain foods, such as milk, coffee, tea, and whole grains, can significantly inhibit the absorption of Eisensulfat. Official documents note the importance of separating the medicine from these food substances to ensure optimal uptake. The information does not recommend adjusting a healthy diet based on supplement use.


Q: Why do some doctors suggest taking Eisensulfat on an alternate-day schedule?

Official guidance on administration includes flexible dosing options for daily use. If a user experiences frequent side effects, healthcare providers may suggest taking the tablets on alternate days. This alternate-day schedule is sometimes used to improve patient tolerability of the medicine.


Q: Is it normal for stools to appear very dark or black when taking Eisensulfat?

Yes, according to the official patient information, the appearance of very dark or black stools is a common, expected occurrence when taking oral iron supplements. This change is caused by unabsorbed iron passing through the digestive system. It is generally considered a harmless cosmetic effect.


Q: What are the general expectations for when a patient might start to notice the beneficial effects of Eisensulfat?

Official studies and product information indicate that initial beneficial changes in blood parameters (known as the hematologic response) can typically begin within 3 to 10 days of starting therapy. Increases in the key blood protein, hemoglobin, generally begin to be observed within 2 to 4 weeks.


Q: Can liquid Eisensulfat cause staining on the teeth, and how is this commonly avoided?

Yes, liquid ferrous salts may cause temporary tooth discolouration. Official guidelines suggest methods to minimize this effect, such as using a dropper or straw to place the dose on the back of the tongue. Following the dose with water is also referenced in patient guidance.


Q: Is it possible for low stomach acid to interfere with the absorption of Eisensulfat?

Regulatory documents list that the absorption of Ferrous Sulfate is reduced when taken alongside antacids or other medicines that lower stomach acid, requiring a minimum two-hour separation. This documented interaction indicates that a certain level of stomach acidity is important for the body to optimally dissolve and absorb the iron salt.


Q: What should a user do if they experience persistent, severe digestive upset while taking Eisensulfat?

Official safety warnings state that severe symptoms, such as persistent vomiting, severe stomach pain, or bloody/tarry stools, require immediate medical assessment. These serious symptoms may indicate a severe adverse reaction.


Q: Are there any known side effects of Eisensulfat that affect the skin or hair?

While the most common side effects involve the digestive system, regulatory documents list severe allergic reactions (hypersensitivity) as a possible, rare outcome. These severe reactions can involve symptoms affecting the skin, such as hives or rash. These reactions are considered serious and should be evaluated immediately by a healthcare professional.


Q: What are the official signs of a possible iron overdose from Eisensulfat that require urgent attention?

Official safety warnings describe that symptoms of an iron overdose can include nausea, severe stomach pain, vomiting, bloody diarrhea, lethargy (extreme tiredness), rapid pulse, and shock. The serious nature of iron poisoning means that the appearance of these signs requires immediate emergency medical assessment.


Q: Is Eisensulfat typically available over-the-counter or does it require a prescription in most regions?

Ferrous sulfate is available in certain countries, such as the United States, in different formulations classified as both a human prescription drug and an Over-The-Counter (OTC) supplement. The required status typically depends on the specific dosage strength or formulation being used.


Q: If a dose of Eisensulfat is accidentally missed, what is the general guidance on how to proceed?

Official patient guidance advises that if a dose is missed, it should be taken as soon as it is remembered, unless it is almost time for the next scheduled dose. In that case, the missed dose should be skipped entirely. Official guidance states that a double dose should not be taken to make up for a forgotten dose.

How should Eisensulfat be stored and disposed of?

Storage and Stability Requirements

Eisensulfat (Ferrous Sulfate) must be stored in its original container, which should be kept tightly closed to protect the contents. The product must be stored at a controlled room temperature, generally below 25 C or 30 C, and must not be frozen. Storage is required in a dry place, protected from light and excessive heat, as the iron salt is sensitive to moisture and oxidation.

Child-Safety and Disposal

The most critical regulatory constraint is to keep the medicine out of the sight and reach of children due to the high risk of accidental iron poisoning. Regarding disposal, unused or expired Eisensulfat must not be thrown into household trash or poured down a sink or toilet. The official instructions require disposal through an approved medicine take-back program or as directed by an authorized waste disposal plant, following all local regulations.

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

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