Rafassal

Quick links to important sections

Rafassal

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 Rafassal

Quick Facts

Property Description
Active Ingredient Mesalazine (5-Aminosalicylic Acid)
Forms Gastro-resistant tablets, prolonged-release granules, suppositories, rectal suspension
Pharmacological Class Aminosalicylate, Local-acting anti-inflammatory
General Purpose To help control chronic inflammation in the intestinal lining
Origin Synthetic salicylate derivative

Rafassal: Identity, Active Ingredient, and Drug Class

Rafassal is a prescription-only pharmaceutical whose core identity lies in its sole active component, Mesalazine, which is chemically known as 5-Aminosalicylic Acid (5-ASA). It is firmly classified within the aminosalicylate drug class, a group of synthetic compounds that are clinically recognized for their anti-inflammatory properties focused on the gastrointestinal tract. This compound represents the key therapeutic moiety used in the management of chronic bowel conditions.

Unlike older formulations, Rafassal is a single-component drug that delivers 5-ASA directly, bypassing the need for a carrier molecule that can lead to systemic intolerance in some patients. Pharmacological studies confirm Mesalazine's local anti-inflammatory effect, establishing its essential role in maintaining bowel health. This composition is strategically designed to achieve maximum therapeutic effect within the gut wall.

Targeted Delivery and General Purpose of Mesalazine

The primary purpose of this medicine is to help manage the chronic irritation and swelling that affects the inner lining of the digestive system. To ensure the active component acts directly on the diseased tissue, Rafassal is available in multiple sophisticated dosage forms, including oral gastro-resistant tablets and prolonged-release granules, alongside topical rectal forms such as suppositories and enemas.

These formulations employ advanced delivery technologies, such as specialized coatings or matrix systems, to protect the Mesalazine until it reaches the targeted segments of the bowel, such as the colon or terminal ileum. This targeted delivery is a key feature, ensuring the 5-ASA concentration is highest precisely where the inflammation occurs. The overall benefit is the focused control over the underlying inflammatory process, supporting the long-term stability and integrity of the intestinal tissue.

Regulatory References

  1. Mesalamine - StatPearls - NCBI Bookshelf

What side effects are possible with Rafassal?

Adverse Reaction Scope

Key adverse reaction categories: Adverse effects are officially categorized by the frequency of occurrence (common, uncommon, rare, very rare) and by the affected System-Organ Class (SOC), including Gastrointestinal, Nervous System, Skin, Blood/Lymphatic, Renal, and Cardiac systems.

Frequency Classification
Common Headache, abdominal pain, diarrhea, nausea, vomiting, flatulence, and rash.
Rare/Uncommon Dizziness, photosensitivity, acute pancreatitis, drug fever, and myo- and pericarditis (cardiac hypersensitivity reactions).
Very Rare Serious blood dyscrasias (e.g., aplastic anaemia, agranulocytosis), renal function impairment (e.g., interstitial nephritis), and hepatotoxicity.
Not Known Severe Cutaneous Adverse Reactions (SJS, TEN, DRESS), nephrolithiasis, and Idiopathic intracranial hypertension.

Serious Adverse Reactions (Label-Documented)

Serious adverse reactions reported in regulatory sources include Severe Cutaneous Adverse Reactions (SCARs), such as Stevens-Johnson syndrome (SJS) and Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS). Other serious concerns include internal organ hypersensitivity, the potential for acute and chronic renal impairment (interstitial nephritis), and hepatotoxicity (hepatic failure). The Mesalamine-Induced Acute Intolerance Syndrome, which presents with symptoms difficult to distinguish from an exacerbation of the underlying condition (e.g., cramping, bloody diarrhea, fever), is also officially documented.

Population-Specific and Time-Related Safety

Safety constraints define that the medication is contraindicated in patients with known hypersensitivity to salicylates or severe renal or hepatic impairment. Caution is specifically advised for older adults and patients with pre-existing skin conditions, such as atopic dermatitis, who may experience more severe photosensitivity. The Acute Intolerance Syndrome has been reported following the initiation of treatment, while co-administration with immunosuppressants like Azathioprine can potentially increase the risk of blood dyscrasia.

Overdose and Emergency Response

The official regulatory documentation for Rafassal (Mesalazine) defines the overdose profile through a documented set of clinical manifestations and explicit instructions for emergency action. This information is derived from government-authorized prescribing information.

Documented Overdose Manifestations

Overdose may present with a specific symptom profile consistent with a salicylate derivative. These documented signs may affect multiple physiological systems. Manifestations include gastrointestinal distress such as nausea, vomiting, and abdominal pain. Neurological and systemic effects reported in overdose situations are headache, dizziness, confusion, and the auditory symptom of tinnitus (ringing in the ears). More severe presentations officially documented also include seizures and altered respiration, specifically fast or shallow breathing.

When to Seek Urgent Medical Help

The regulatory labeling mandates seeking immediate medical assistance under specific, severe conditions that constitute physiological compromise. Urgent attention is required, and emergency services must be called immediately, if an individual experiences collapse, has a seizure, develops trouble breathing, or cannot be awakened (loss of consciousness). The official labeling strictly defines these severe, observable outcomes as the triggers for mandatory emergency response. The documents do not explicitly detail the availability of a specific antidote or list explicit supportive management procedures for the overdose scenario.

Therapeutic Uses of Rafassal

What Rafassal Treats: Main Uses and Benefits

Rafassal is a medication primarily relevant for easing symptoms linked to inflammatory or irritative states within the digestive system. Its primary role is generally used to help manage and provide maintenance support for Ulcerative Colitis (UC). It is commonly used for managing conditions involving mild-to-moderate disease activity, including ulcerative proctitis and proctosigmoiditis.


Easing Active Symptom Clusters and Supporting Stability

Rafassal is applied in clinical settings that involve acute or unstable symptom patterns, such as during flare-ups of conditions characterized by periods of heightened symptoms. It is used to help address symptom clusters that may become intense or disruptive, particularly those symptoms related to physical discomfort and rectal bleeding in the bowel. This short-term symptomatic assistance contributes to improved day-to-day comfort during symptomatic periods, and may assist with maintaining a sense of stability when symptoms are more noticeable.

Supporting Long-Term Functional Stability

The medication is commonly used in long-term scenarios to support the patient during difficult episodes and is generally relevant when supportive symptom management is appropriate to maintain a sense of stability when symptoms are more noticeable. This long-term application provides support that helps ease the overall symptom burden and may help contribute to supporting functional stability over time.


Quick Fact: Relief for Ulcerative Colitis
Primary Use Context Easing acute symptoms (e.g., bleeding, pain) and supporting long-term management and easing recurrent symptoms in mild-to-moderate Ulcerative Colitis.
Symptom Focus Symptoms that create noticeable functional strain due to inflammation and irritation in the lower bowel.
Patient Benefit Provides support that helps ease the overall symptom burden and contributes to maintaining functional stability.

Regulatory References

  1. NIH MedlinePlus overview

Eligibility and Restrictions for Use

Who can and cannot use Rafassal?

The eligibility to use Rafassal (Mesalazine) is strictly defined by mandatory population rules and absolute contraindications established in official regulatory prescribing information. The medicine is primarily intended for Adults.

Contraindicated and Restricted Populations

Eligibility Status Key Population Restrictions
Use Prohibited (Contraindicated) Patients with known hypersensitivity to Mesalazine, salicylates (such as aspirin), or any formulation component. Patients diagnosed with severe renal impairment or severe hepatic impairment
Use Restricted (Conditional) Individuals with pre-existing kidney or liver disease require formal monitoring of organ function. Use during pregnancy or lactation is generally restricted and requires the potential benefit to officially outweigh the possible hazard.

Eligibility for the pediatric population is restricted by specific minimum age and weight thresholds, with safety and effectiveness often not established in children younger than five or six years old. Older adults must be treated with caution, especially if renal function is already impaired. The medicine must be permanently discontinued if renal function significantly deteriorates or if a Mesalazine-induced acute intolerance syndrome is suspected.

What should I know about interactions with other medicines?

Interactions with other medicines and products

This section describes the officially documented interaction patterns for Mesalazine (the active ingredient in Rafassal) as stated in government regulatory sources.

Interaction Scope

Category Regulatory Statement on Interaction Pattern
Medicinal product categories with documented interactions Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), Thiopurine analogs, Nephrotoxic agents, Antacids/pH-modifying agents.
Specific interacting medicines (if explicitly listed) Azathioprine, 6-Mercaptopurine, Warfarin, Oral Iron.
Mechanistic basis of interactions Altered absorption due to change in local pH (Pharmacokinetic); Impaired thiopurine metabolism (Metabolic); Additive organ toxicity (Pharmacodynamic).
Timing-based interaction rules Administration of certain oral formulations may require separation from Antacids or PPIs to prevent premature drug release of Mesalazine in the stomach.
Population-specific interaction notes The risk of adverse renal reactions (nephrotoxicity) is heightened in patients with pre-existing renal dysfunction when co-administered with NSAIDs or other nephrotoxic agents.

Official Interaction Statements

  • Co-administration with Thiopurine analogs ( Azathioprine or 6-Mercaptopurine) may increase the risk of myelosuppression (blood disorders) due to inhibition of the thiopurine's metabolism and subsequent increased systemic exposure.
  • Concurrent use with NSAIDs or other nephrotoxic agents may increase the risk of renal adverse reactions (nephrotoxicity), representing an officially documented additive toxicity concern.
  • Mesalazine has been documented to potentially increase or decrease the anticoagulant effect of Warfarin.
  • Mesalazine use may lead to spuriously elevated test results when measuring urinary normetanephrine by liquid chromatography with electrochemical detection, constituting a drug-laboratory test interaction.

Connection to the overall interaction profile: The regulatory profile highlights constraints related to additive toxicity with nephrotoxic agents and precautions necessary for altered drug exposure when combined with thiopurines. Administration requirements are also defined to mitigate pharmacokinetic interactions where pH-modifying agents may cause premature release from the specialized oral formulation.

Mechanism of Action

How Rafassal Works

The mechanism of Rafassal (Mesalazine) is defined by its ability to exert a multi-factorial anti-inflammatory action directly on the intestinal mucosa. The overall effect is the biochemical modulation of the inflammatory process across three distinct, complementary domains.

Targeted Signal Cascade Modulation

Rafassal modulates core genetic programming by acting on regulatory elements within epithelial cells. It inhibits the activation of NF-kappaB, the primary molecular switch for pro-inflammatory gene expression, while simultaneously activating the anti-inflammatory nuclear receptor PPAR-gamma. This dual interference suppresses the synthesis and release of inflammatory proteins and cytokines, directly modulating the molecular cascade that sustains localized tissue inflammation.

Anti-Oxidant and Mediator Suppression

The drug limits the chemical spread of inflammation by acting as a direct scavenger of Reactive Oxygen Species (ROS) and other damaging free radicals. Furthermore, 5-ASA non-specifically interferes with the enzymatic pathways (COX and LOX) that produce pro-inflammatory eicosanoids. This combined mechanism results in a reduction of free radicals and a limitation of chemical messengers that promote localized vascular changes and cellular infiltration.

Localized Concentration Dependence

The mechanistic efficacy is critically dependent on achieving and maintaining a high concentration of the active ingredient topically on the affected intestinal surface. This high local concentration is the principal factor in saturating the multiple biological targets and pathways, supporting the topical engagement of the anti-inflammatory mechanism, which is concentration-dependent and limited by systemic drug levels.

Dosage and Administration Information

Official Administration Guidelines

Rafassal, which contains mesalazine, is administered through either the oral or rectal route, with the specific method and dosage depending on the intended treatment goal.

Dosing Summary (Adults)

Usage Context Daily Dosage Range Administration Pattern
Induction of Remission (Oral) 2.4 g to 4.8 g Once daily or in divided doses
Maintenance of Remission (Oral) 2.4 g Once daily
Rectal Suppository 1000 mg Once daily, typically at bedtime

Procedural Instructions

Oral administration requires that the tablets or capsules be swallowed whole and not split, crushed, or chewed, as doing so compromises the specialized delayed- or prolonged-release mechanism required for targeted delivery to the bowel. Fluid intake should be adequate throughout the course of therapy to support proper kidney function.

Timing relative to meals is formulation-dependent; some oral forms are to be taken with food, while others may be used on an empty stomach. Rectal suppositories are usually administered at bedtime and should be retained for at least one to three hours, or longer if possible, to maximize local action.

For pediatric patients, the dose is determined based on body weight, with different daily amounts and maintenance schedules specified for children weighing at least 24 kg who can swallow the tablets whole. The transition from the higher-dose induction regimen to the lower-dose maintenance regimen defines the overall use protocol of the medicine over time.

Recent Clinical Evidence

Rafassal: Recent Clinical Evidence

Conditions Characterized by Fluctuating Intestinal Symptoms (Ulcerative Colitis)

Rafassal was studied for conditions characterized by fluctuating or episodic manifestations, primarily Ulcerative Colitis. Research examined its application both during acute, disruptive episodes where symptoms become more noticeable and for longer-term monitoring of the disease. These studies explored short-term symptom changes, focusing on outcomes related to physical discomfort and patient-reported outcomes describing perceived discomfort.

Findings describe patterns observed in the studies; studies describe patterns of change measured during the study period, particularly in measuring periods of stability. Studies monitored outcomes related to systemic or functional imbalance and daily functioning. Research has explored whether different formulations (like suppositories or enemas) target affected areas locally. Research highlights changes measured during the study period related to outcomes describing episodic or acute changes.

Research Exploring Long-Term Symptom Control and Special Populations

Further studies explored the use of Rafassal for maintenance therapy—research exploring outcomes related to the recurrence of conditions involving periods of heightened symptoms. This long-term research monitored outcomes reflecting daily functioning or activity level.

However, data for certain groups remain insufficient. For instance, appropriate studies have not been performed in the pediatric population, and certainty remains low regarding study outcomes and long-term outcomes for children. Similarly, there are no adequate data on the use of Rafassal during pregnancy, and while evidence on a limited number of exposed pregnancies was observed in some studies, data did not show a pattern of adverse effects. The evidence for this population is limited.

Research highlights what is known and what is still uncertain. Comparative evidence against certain treatments is lacking in some study settings, and follow-up durations were limited in specific trials. Findings describe group patterns, not personal outcomes; research does not determine whether an individual will respond similarly, and results apply only to the populations studied.

Frequently Asked Questions (FAQ)

Common questions about Rafassal (FAQ)


Q: How long does it typically take for a person to notice the effects of Rafassal?

Studies indicate that a person may start to notice the beneficial effects of Rafassal within 3 to 21 days after starting the medicine. While the active component begins working immediately on the inflammation, the time it takes for symptoms to improve noticeably may vary based on individual response and condition severity.


Q: What is the typical duration of effect after a single dose of Rafassal?

Rafassal is primarily intended for chronic, continuous use to control ongoing intestinal inflammation, rather than providing single-dose symptom relief. The mechanism of the drug is designed to have a local, topical effect on the inflamed gut lining. The active ingredient persists in the bloodstream for a prolonged period, with an average elimination half-life of approximately 25 hours.


Q: How is a common side effect of Rafassal distinguished from an allergic reaction?

Official safety information distinguishes between common side effects (like a mild headache or stomach discomfort) and a severe hypersensitivity or allergic reaction. Common side effects are often expected, and their persistence should be discussed with a healthcare professional. Symptoms of a serious allergic reaction, such as swelling of the face, tongue, or chest pain, are generally described as requiring immediate medical attention in official warnings.


Q: Are there any known long-term side effects or risks associated with extended use of Rafassal?

Rafassal is frequently prescribed as a long-term maintenance treatment. Regulatory sources have identified rare, serious risks associated with extended use, including potential damage to the kidneys (renal impairment) and, very rarely, inflammation of the liver (chronic hepatitis). For this reason, official guidelines recommend regular monitoring of kidney and liver function during long-term therapy.


Q: What are the official guidelines regarding signs or symptoms that require immediate medical attention?

Official guidelines highlight that immediate medical attention is necessary if certain severe symptoms occur. These can include signs of a serious skin reaction (such as widespread blistering or rash accompanied by fever), or symptoms of the Acute Intolerance Syndrome (like severe abdominal cramping and bloody diarrhea). Additionally, sudden yellowing of the skin or eyes or unexplained bruising are officially categorized as symptoms that warrant prompt contact with a healthcare professional.


Q: Does Rafassal interact with common over-the-counter pain relievers like ibuprofen or acetaminophen?

Official interaction warnings specifically mention Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), such as ibuprofen, which may increase the risk of kidney-related side effects when taken with Rafassal. No major interaction is typically reported for non-NSAID pain relievers like acetaminophen.


Q: Is it generally safe to take Rafassal with common vitamins or mineral supplements?

Regulatory documents focus on listing known drug-drug or drug-specific supplement interactions, such as those with oral iron supplements. There are no broad regulatory warnings against taking the medicine with most common vitamins or general mineral supplements.


Q: Does Rafassal interact with over-the-counter cold, allergy, or flu medications?

Many common cold, flu, or allergy medications contain ingredients that are known to interact with Rafassal or its side effects. For example, these remedies often contain NSAIDs or antacids, both of which have documented interaction potential. Furthermore, taking medications that cause drowsiness alongside Rafassal may worsen the reported side effect of dizziness.


Q: Is a generic version of Rafassal available on the market?

Yes, the active ingredient in Rafassal is known generically as mesalazine (or mesalamine). This active component is available in several FDA-approved generic formulations.


Q: Does Rafassal carry a specific 'Black Box' or comparable safety warning in regulatory information?

The U.S. FDA label for the active ingredient does not include a Boxed Warning (the 'Black Box'). However, the label does contain highly visible Warnings and Precautions sections that outline serious potential reactions. These sections cover concerns regarding renal impairment, acute intolerance, and severe skin reactions (SCARs).


Q: Can stopping Rafassal abruptly lead to discontinuation or withdrawal symptoms?

Regulatory documents do not mention 'withdrawal' symptoms, but they strongly caution against stopping the medicine suddenly. This is because discontinuing the medicine significantly increases the risk that symptoms of the underlying inflammatory condition will return (flare-up).


Q: Does official information state that Rafassal may affect the ability to drive or use machinery?

Official product information generally indicates that Rafassal is unlikely to affect a person's ability to drive a car or safely operate machinery. If side effects such as dizziness occur, official information advises caution.


Q: Are the side effects of Rafassal usually temporary, or are some considered permanent?

Most commonly reported side effects, such as mild gastrointestinal upset or headaches, tend to lessen or completely resolve after the first few weeks of therapy. However, rare, serious side effects affecting organs, such as severe kidney or liver impairment, can become chronic or permanent if the medication is continued, though this risk is addressed by the recommended monitoring protocols.


Q: Is the use of Rafassal with alcohol addressed in the official product information?

Regulatory information generally states that taking Rafassal does not prohibit the consumption of alcohol. Official patient information notes that alcohol is known to irritate the gastrointestinal tract and may potentially worsen the symptoms of the underlying condition Rafassal is being used to manage.


Q: Are there any specific foods or beverages that are known to interact with Rafassal?

Official patient information leaflets usually state that a person may eat normally while taking Rafassal, indicating no specific food groups are formally listed as needing to be completely avoided. Instructions regarding food are typically limited to whether a specific formulation should be taken with or without a meal to ensure proper absorption.


Q: Is Rafassal listed as a controlled substance by regulatory agencies?

No, the active ingredient in Rafassal, mesalazine, is not classified as a controlled substance by regulatory agencies like the US Controlled Substances Act. This indicates that the medicine has not been associated with potential for abuse or dependence.


Q: What is the general non-directive guidance for what to do if a dose of Rafassal is missed?

General non-directive guidance is to take the missed dose as soon as you remember. However, if it is almost time for your next scheduled dose, the official advice is to skip the missed dose and continue with the regular schedule. It is specifically advised not to take two doses at the same time to compensate for the one you forgot.

How should Rafassal be stored and disposed of?

Storage and Disposal Conditions for Rafassal

Official regulatory information outlines specific storage and handling requirements to maintain product stability and safety.

Required Storage and Protection

Condition Requirement
Temperature Store at a temperature below 25°C (77°F); refrigeration is permitted.
Environment Protect from direct heat, light, and humidity.
Container Keep the product in its tightly closed original container.
Safety The medication must be kept out of the reach of children.

Handling and Disposal

The suppositories carry a warning that they will stain direct contact surfaces (such as fabrics or flooring), and contact should be avoided. Disposal of any unused or expired product must be carried out according to local regulations.

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

Available in countries:

Equivalent of Rafassal found in:

A-Z Index: