Cloromisan

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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 Cloromisan

Cloromisan is a pharmaceutical preparation containing the active ingredient Chloramphenicol, an antibiotic primarily used for treating serious bacterial infections where other safer options are ineffective or contraindicated. Its potency and broad-spectrum activity categorize it as a valuable, reserved anti-infective agent due to its critical role in health systems.

Property Description
Active ingredient Chloramphenicol
Form Capsule, Tablet, Solution, Eye drops, Ointment
Pharmacological class Amphenicol-class Antibacterial
Common use Systemic bacterial infections
Origin Synthetic (originally from S. venezuelae)

What Type of Drug Is Cloromisan?

Cloromisan is a powerful synthetic anti-infective agent whose core component is Chloramphenicol. It is classified as an Amphenicol-class Antibacterial, a category of high-efficacy antibiotics typically reserved for severe infections. Though originally isolated from the soil bacterium Streptomyces venezuelae, the drug is now manufactured synthetically, ensuring consistent chemical identity and supply. Its broad-spectrum action makes it effective against a wide variety of bacteria, distinguishing it from many narrow-spectrum alternatives.


Understanding the Composition and Forms of Cloromisan

The composition of Cloromisan centers on the active substance Chloramphenicol, which may be modified into inactive prodrugs—such as Chloramphenicol palmitate for oral liquids or Chloramphenicol succinate for intravenous administration—to optimize delivery. The medication is manufactured in various dosage forms, including oral capsules and syrups, as well as specialized topical applications like eye drops. This versatility ensures the drug can be administered via different routes of administration—oral, intravenous (IV), or topical—to target the infection site effectively.

What side effects are possible with Cloromisan?

Official Safety Profile and Adverse Reactions

The safety profile of Cloromisan (Chloramphenicol) is defined by the potential for serious hematological and toxic reactions, which is why regulatory bodies mandate its use only for severe infections when safer alternatives are ineffective.

Serious Adverse Reactions

The most significant safety concern is the risk of blood dyscrasias, categorized into two types. The rare but often fatal complication is irreversible aplastic anemia, which has been documented to appear weeks or months after treatment cessation, even following short-term exposure. The more common, predictable, and dose-related bone marrow depression is typically seen during therapy and resolves upon discontinuation of the medicine.

Another severe reaction is Gray Syndrome, a toxic event primarily occurring in premature and newborn infants due to their reduced ability to metabolize the drug. Symptoms typically begin within three to four days of high-dose treatment.

System-Organ Classes and Less Common Effects

Adverse effects are also documented across other systems:

  • Nervous System: Reactions may include headache, mild depression, mental confusion, and delirium. Neurotoxicity such as optic and peripheral neuritis has been reported, usually associated with long-term systemic use.
  • Gastrointestinal: Nausea, vomiting, diarrhea, glossitis, and stomatitis are known adverse reactions.
  • Immune System: Hypersensitivity reactions, including fever and skin rashes, are documented.

Population-Specific Safety Notes

The medicine is not recommended for use during pregnancy or lactation due to the potential for fetal or infant toxicity. Patients with existing hepatic (liver) impairment may be at an increased risk of side effects due to the drug's metabolism. Official labeling requires that adequate blood studies be performed during treatment to monitor for blood dyscrasias.

Overdose and Emergency Response

The official regulatory profile for Cloromisan overdose describes a range of serious clinical manifestations and mandates immediate emergency action. Documented presentations include severe gastrointestinal symptoms (nausea, vomiting, abdominal distension) and neurological changes, including mental confusion and progression to coma. Physiologically, overdose may result in hypotension, hypothermia, and severe metabolic acidosis, which can escalate to cardiovascular collapse. Hematological effects, such as leukopenia and thrombocytopenia, are also cited in the official prescribing information.

A critical, life-threatening risk—the Gray Syndrome—is specifically documented in neonates and infants, caused by the inability to metabolize the drug effectively. This syndrome is characterized by progressive pallid cyanosis and vasomotor collapse. Urgent medical help is required immediately upon suspected overdosage. The regulator-mandated emergency response includes the immediate discontinuation of the drug and the provision of intensive supportive care and life-saving measures.

In the case of serious systemic overdosage, charcoal hemoperfusion is an officially described procedure that may be effective in removing the drug from plasma. No specific antidote is known; therefore, management is strictly symptomatic and supportive, as outlined in regulatory documents.

Therapeutic Uses of Cloromisan

What Cloromisan Treats: Main Uses and Benefits

Cloromisan (Chloramphenicol) is used in situations involving certain distressing symptoms across therapeutic domains and is generally reserved for conditions characterized by periods of heightened symptoms.

Therapeutic Contexts and Symptom Relief

Cloromisan is commonly used across conditions presenting with acute episodes, which include systemic diseases like typhoid fever, certain severe Rickettsial infections, and meningitis caused by susceptible strains. In these acute, high-burden clinical settings, it is applied during phases of increased distress where specialized symptomatic assistance is needed. The medication helps address symptom clusters that may become intense or disruptive and is relevant for easing symptoms related to systemic imbalance, such as high fever and severe systemic distress. This supports the patient during difficult episodes by easing distress.

“It is a medication that provides supportive relief in contexts where symptoms have become temporarily overwhelming.”

In a distinct, localized context, Cloromisan is commonly used to help with acute bacterial conjunctivitis and other superficial eye infections. In these scenarios, the medication is relevant for managing symptoms that interfere with daily comfort in conditions involving inflammatory or irritative processes, like eye redness, soreness, and discharge. This provides supportive relief that assists with maintaining functional stability.


Quick Fact: Relief for Systemic Discomfort

Cloromisan is applied when symptoms related to heightened physiological activity, such as persistent high fever in severe infections, create noticeable physiological strain, offering supportive relief when symptoms become temporarily overwhelming.

Regulatory References

  1. Chloramphenicol - StatPearls - NCBI Bookshelf - NIH

Eligibility and Restrictions for Use

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

The eligibility profile for Cloromisan (Chloramphenicol) is highly restricted and defined by official regulatory bodies, limiting its use to contexts where the benefit outweighs the inherent risks, often when less dangerous alternatives are ineffective.


Eligibility Scope Status as Stated in Regulatory Documents
Populations Contraindicated Individuals with a history of hypersensitivity to Chloramphenicol, blood dyscrasias, aplastic anaemia, or acute porphyria.
Non-Recommended Use Neonates and preterm infants, due to the risk of Gray Syndrome toxicity. Systemic use near term pregnancy and during breastfeeding is also generally advised against.
Conditional Use Groups Patients with impaired hepatic (liver) or renal (kidney) function, and the elderly. Use in these groups requires caution and often mandates plasma concentration monitoring.
Condition-Based Exclusion Contraindicated for the treatment of trivial infections (e.g., colds, sore throats) or for use as a prophylactic agent.

Official Eligibility Statements:

  • Cloromisan is contraindicated in persons who have shown hypersensitivity to any of its components or have pre-existing blood disorders.
  • Systemic use in neonates is generally not recommended due to the potential for fatal toxicity (Gray Syndrome).
  • Use in pregnancy is generally categorized as a Category C risk, permitting use only when the potential benefit justifies the potential risk to the fetus.

Connection to the overall eligibility profile: The regulatory framework establishes that Cloromisan is a reserved medicine. Eligibility is strictly denied to individuals with pre-existing blood conditions or drug hypersensitivity, and use is highly restricted or subject to monitoring in vulnerable populations, including infants and patients with organ impairment, to mitigate severe, officially documented risks.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information identifies specific risks associated with co-administering Cloromisan due to its documented ability to inhibit the metabolism of other medicines. This potential for a pharmacokinetic interaction results in increased exposure and the risk of toxicity for the co-administered drug.

Interaction Scope and Constraints

Medicinal product categories with documented interactions include anticoagulants and certain anticonvulsants. Specific interacting medicines highlighted in official labeling are Warfarin, Phenytoin, and Phenobarbital.

The core mechanistic basis of these clinically significant interactions is the drug’s documented effect as an inhibitor of certain Cytochrome P450 (CYP) enzymes (e.g., CYP2C19 and CYP3A4). This enzyme inhibition reduces the clearance of drugs metabolized by these pathways.

Official Interaction Statements

  • Co-administration with Warfarin may enhance the anticoagulant effect, leading to an increased risk of bleeding. The interaction constraint requires monitoring of INR or prothrombin time.
  • Co-administration with Phenytoin or Phenobarbital impairs their metabolism, which necessitates monitoring of their serum concentrations to prevent toxicity.

Population-Specific Notes and Constraints

An interaction constraint noted in regulatory documents is the necessity for caution and potential accumulation in patients with impaired hepatic function and in the neonatal population. The resulting interaction structure is defined by the requirement for Therapeutic Drug Monitoring when used with narrow therapeutic index agents to manage the risk of elevated plasma concentrations.

Mechanism of Action

Targeted Inhibition of Protein Synthesis

Cloromisan's mechanism is defined by its selective interference with the essential protein synthesis pathway of the bacterial pathogen, resulting in the functional constraint of proliferation. The active component, Chloramphenicol, acts within the domain of protein synthesis interference by binding reversibly to the 50S ribosomal subunit of the bacterial cell. By targeting the peptidyl transferase center, the drug initiates a signaling sequence that suppresses peptide bond formation, which is the fundamental step required for the pathogen to build necessary enzymes and structural components. This early molecular step modifies the systemic outcome by resulting in the inhibition of bacterial cell replication.


Functional Constraint on Pathogen Growth

The molecular inhibition leads to a rapid arrest of bacterial proliferation (bacteriostasis), which establishes a bacteriostatic state by constraining the exponential growth phase of the pathogen population. The mechanism engages key biological processes that regulate growth, but is constrained by factors like the bacterial production of the Chloramphenicol Acetyltransferase (CAT) enzyme or efflux pumps, which actively counter the drug's action by reducing its concentration at the ribosomal target. This functional limitation must be overcome by the host's immune system to achieve clearance.

Dosage and Administration Information

How to Use Cloromisan: Official Administration Guidelines

Cloromisan administration is governed by established protocols that determine the route, dosage, and duration of use. The medication is available for oral, Intravenous (IV), and Topical (Ophthalmic) administration, where the IV route is reserved for serious systemic infections requiring rapid therapeutic concentration, as the intramuscular route is noted to be ineffective.


Administration Scope

The standard systemic dosing regimen for adults is 50 milligrams per kilogram of body weight per day (50 mg/kg/day), which is given in divided doses at 6-hour intervals. The maximum dose of 100 mg/kg/day may be used temporarily in very severe cases, but must be reduced back to 50 mg/kg/day as quickly as possible. Oral capsules should be taken with water on an empty stomach (one hour before or two hours after meals).

The IV form, which is supplied as a powder, requires reconstitution with an approved diluent, such as sterile Water for Injection, to prepare the solution for use. This solution must be administered slowly, typically over a period of at least one minute.


Age-Group Administration Rules

Official guidelines mandate a lower dose for specific patient groups. Neonates and infants under two weeks of age must receive a significantly reduced initial dose of 25 mg/kg/day in four divided doses due to the immaturity of their metabolic functions. Dosing adjustments are also required for individuals with impaired hepatic or renal function to manage drug concentration.


Course Duration and Use-Context Constraints

Treatment must be continued for the full prescribed duration. For severe systemic conditions like typhoid fever, treatment often continues for 10 to 14 days, maintaining administration for a specific period after the patient’s fever has resolved. For topical ophthalmic use, a shorter course, such as five days for bacterial conjunctivitis, is commonly specified.


Connection to the Overall Use Protocol

The official instructions establish a precise protocol that dictates the form, quantity, timing, and rate of delivery for Cloromisan. This structure moves from selecting the appropriate route based on the need for systemic or local action to confirming the weight-based or fixed dosing schedule. Every procedural step, from IV reconstitution to the minimum duration of therapy, is formally defined to ensure the standardized use of the medication.

Recent Clinical Evidence

Research evidence / Overview of studies for Cloromisan

Cloromisan (Chloramphenicol) was evaluated in research settings for serious bacterial infections to understand the available evidence record. This overview describes the structure of the evidence and areas where research is ongoing or still limited, based only on findings reported by regulatory and scientific sources.


Evidence for Use in Severe Systemic Infections

Research has utilized Randomized Controlled Trials (RCTs) and Systematic Reviews to explore the use of Cloromisan in treating severe systemic infections such as typhoid fever and Bacterial Meningitis. These studies examined patient outcomes including Overall Mortality, definitions of Clinical Cure, and the measured rate of Treatment Failure. Research was observed in study populations composed of both adults and children, including those with multi-drug resistant pathogens. Findings describe patterns observed in measured outcomes, including differences in treatment failure rates when comparing Cloromisan to other established antibiotic treatments. This mixture of data means that findings were heterogeneous, and the methodology of older records sometimes lacks modern standards.


Evidence for Use in Localized Ophthalmic Infections

Research for the topical form of Cloromisan, used for conditions like Acute Bacterial Conjunctivitis, was evaluated in numerous RCTs and subsequent Meta-Analyses. These studies explored short-term symptom changes and outcomes linked to inflammatory or irritative states. Research examined endpoints like Clinical Remission and Microbiological Cure at short follow-up periods. Research indicates that the outcomes measured are influenced by the high rate of spontaneous resolution of the condition itself. Findings describe the frequency of achieving clearance, and differences measured against placebo were minimal in some trials.


Evidence Gaps and Uncertainty

The available research primarily focuses on acute, short-term resolution. Long-term outcomes beyond the immediate post-treatment follow-up are not fully characterized. While the drug was studied across a wide range of ages (pediatric and adult patients), data for certain groups remain insufficient, such as those with specific comorbidities. The evidence quality varies across studies, and comparative evidence is lacking against some of the newest treatment options, highlighting where the level of certainty remains low. The research provides context but does not determine whether an individual will respond similarly.

Frequently Asked Questions (FAQ)

Common questions about Cloromisan (FAQ)


Q: Are there any specific foods or drinks that should be avoided while taking Cloromisan?

A: Official drug labels contain a note that the use of alcohol while taking this medicine should be discussed with a healthcare professional. For the oral capsule form, official guidelines state that it should be taken on an empty stomach, which means one hour before or two hours after a meal.

Q: Is it possible to take Cloromisan if I have kidney issues?

A: Individuals with impaired renal, or kidney, function are classified as a Conditional Use Group in regulatory documents. This indicates that caution is required, as outlined in official documents, and dosing may need adjustment to manage the concentration of the medicine in the body.

Q: Can people with liver problems use Cloromisan?

A: Individuals with impaired hepatic, or liver, function are included in the Conditional Use Group due to how the drug is metabolized in the body. If used, caution is required, as outlined in official documents, and may necessitate monitoring of drug concentration, based on official constraints.

Q: Is Cloromisan generally appropriate for older adults?

A: In official regulatory documents, the elderly are classified as a Conditional Use Group. This means that while use may be permitted, caution is required. Use in this population may necessitate monitoring due to the potential for the medicine to accumulate in the body.

Q: Can children or adolescents use Cloromisan?

A: Official labels provide detailed administration rules for neonates and infants, and research records confirm its use in pediatric patients. This indicates its use is restricted and subject to monitoring, particularly in very young infants, due to the documented risk of toxicity.

Q: Are there any research studies discussing the long-term use of Cloromisan?

A: Research reviewed in official records primarily focuses on acute, short-term resolution of infections. Regulatory and scientific sources officially state that long-term outcomes beyond the immediate post-treatment follow-up are not fully characterized by the available evidence.

Q: Is Cloromisan considered a standard treatment, or is it a newer drug?

A: Cloromisan is an established medication and is listed on the World Health Organization's List of Essential Medicines. It is classified as a reserved anti-infective agent, which means its use is typically constrained to specific, serious infections.

Q: How does Cloromisan differ from a generic version of a similar drug?

A: The active ingredient in Cloromisan is Chloramphenicol. Any drug containing this same active ingredient, whether brand or generic, is based on the same fundamental chemical substance.

Q: Is it true that Cloromisan can affect sleep patterns?

A: Official documentation for the medicine lists adverse reactions related to the nervous system, including mild depression, mental confusion, and delirium. Additionally, drowsiness has been reported as a rare side effect.

Q: What is the typical duration of treatment with Cloromisan?

A: Treatment must be continued for the full duration prescribed by a healthcare professional. Examples cited in official documents include 10 to 14 days for severe systemic conditions and five days for topical ophthalmic use.

Q: Is Cloromisan taken once a day or multiple times?

A: According to the official product information, the standard systemic dosing regimen is a total daily dose that is divided and given in multiple doses at regular intervals, typically every six hours.

Q: Do warnings about Cloromisan mention driving or operating machinery?

A: Adverse reactions that may impair mental state, such as mental confusion and delirium, are documented. Official documents note that patients may need to consider how these effects could impact tasks that require full mental alertness, like driving.

Q: Is it necessary to have routine blood tests while taking Cloromisan?

A: Official labeling requires that adequate blood studies be performed during treatment. This monitoring is mandated to check for the risk of blood disorders (dyscrasias), which are a serious documented side effect of the medicine.

Q: Can Cloromisan be used by pregnant individuals?

A: Systemic use during pregnancy is generally categorized as a Category C risk. This classification permits use only in situations where the potential benefit of the medicine is considered to justify the potential risk to the fetus.

Q: Does Cloromisan have a high risk of drug-drug interactions?

A: The drug has documented pharmacokinetic interactions because it can inhibit certain Cytochrome P450 enzymes responsible for metabolizing other drugs. Clinically significant interactions are noted with specific medicines, including anticoagulants like Warfarin and certain anticonvulsants.

Q: Are there different forms of Cloromisan available (e.g., tablet, liquid)?

A: Yes. The medicine is manufactured in various dosage forms, which may include oral capsules and syrups, as well as specialized topical applications such as eye drops and ointments.

Q: Do clinical guidelines mention Cloromisan as a first-line treatment?

A: Cloromisan is classified as an antibiotic primarily used for treating serious bacterial infections. It is reserved for cases where other safer options are ineffective or contraindicated, meaning it is not typically designated as a first-line treatment.

Q: Does taking Cloromisan at a certain time of day matter?

A: Yes, to maintain a consistent level of the medicine, systemic doses are given at regular intervals, such as every six hours. Additionally, the oral capsule form is instructed to be taken on an empty stomach to optimize its absorption.

Q: How does Cloromisan fit into the overall treatment plan for the target condition?

A: It is officially classified as a valuable, reserved anti-infective agent. Its use is constrained to serious bacterial infections where less dangerous alternatives are either ineffective or otherwise contraindicated.

Q: How is the risk of serious side effects described for Cloromisan?

A: The safety profile is defined by the potential for serious reactions. This includes the risk of dose-related bone marrow depression, which is more common and predictable, and irreversible aplastic anemia, which is documented as a rare but often fatal complication.

Q: What should a patient do if they experience an unexpected side effect from Cloromisan?

A: Official information indicates that dose-related bone marrow depression often resolves upon discontinuation of the medicine. The documentation implies that management of side effects involves professional attention, and official labeling mandates that adequate blood studies be performed during treatment.

Q: Can Cloromisan affect laboratory test results?

A: Yes. Official product information notes that Cloromisan may cause false test results with certain urine sugar tests.

Q: Is Cloromisan considered safe to use while breastfeeding?

A: Regulatory constraints advise against the systemic use of Cloromisan during breastfeeding. The medicine is not recommended for use during lactation due to the potential for toxicity in the infant.

How should Cloromisan be stored and disposed of?

How to Store and Dispose of Cloromisan

Storage requirements for Cloromisan (Chloramphenicol) are defined by the product's formulation. Systemic forms, such as capsules, typically require storage at controlled room temperature. However, certain topical solutions, like eye drops, may mandate refrigeration (2 C to 8 C) and mandatory protection from light . It is prohibited to allow the product to freeze.

Child Safety and Disposal

All forms must be kept out of the sight and reach of children.

Once certain topical solutions are opened, they must be discarded within 28 days, regardless of the amount remaining. Unused or expired Cloromisan must be managed according to local pharmaceutical waste requirements and must not be flushed into the sanitary sewer system or wastewater.

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

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