Fivasa

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Fivasa

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 Fivasa

What is Fivasa?

Fivasa is a medicinal product containing the active substance mesalazine, which belongs to a group of drugs known as aminosalicylates. These medications are primarily used to manage inflammatory bowel disease (IBD) by acting locally on the lining of the gut to reduce inflammation.

Therapeutic Purpose

The primary function of Fivasa is to treat and manage conditions characterized by chronic inflammation of the digestive tract. It is most commonly used in the treatment of:

  • Ulcerative Colitis: A chronic condition where the lining of the large intestine (colon) and rectum becomes inflamed and develops small sores or ulcers.
  • Crohn’s Disease: A similar inflammatory condition that can affect any part of the digestive tract, though it is frequently used when the disease involves the colon.

How it Works

Fivasa works through a topical anti-inflammatory effect on the intestinal mucosa. While the exact mechanism is complex, the medication is thought to inhibit the production of certain substances that trigger inflammation in the gut wall. By reducing this inflammation, the medication helps to alleviate symptoms during active flare-ups and assists in maintaining periods of remission.

Available Forms

Fivasa is produced in several different formulations to ensure the active ingredient reaches the specific area of the intestine where the inflammation is located. Depending on the clinical requirement, it may be available as:

  • Delayed-release tablets: Designed to pass through the stomach and release the medication further down the digestive tract.
  • Enemas or Suppositories: Used for localized treatment when the inflammation is concentrated in the lower part of the colon or the rectum.

What side effects are possible with Fivasa?

Fivasa, which contains Mesalazine, has an official safety profile categorized by the frequency and type of possible adverse reactions as documented in regulatory sources such as the FDA and EMA.

Frequency-Classified Adverse Reactions

The most Common adverse reactions typically involve the Gastrointestinal and Nervous System disorders, including headache, abdominal pain, and nausea. Uncommon reactions may include vomiting or leukopenia (low white blood cell count). Reactions classified as Rare or Very Rare include dizziness, hair loss (alopecia), and pancreatitis.

Adverse Reaction Type Common Examples
Gastrointestinal Disorders Abdominal pain, flatulence, nausea
Nervous System Disorders Headache
Skin Disorders Rash, pruritus (itching)

Serious Safety Considerations

Official labeling documents the potential for serious adverse reactions, although these are typically infrequent. Such reactions include renal impairment (nephrotoxicity), which requires cautious use in patients with pre-existing kidney issues, and rare cases of hepatotoxicity (liver injury). There is also the potential for an Acute Intolerance Syndrome, a severe reaction that may present with symptoms mimicking a severe colitis flare, such as fever, bloody diarrhea, and severe cramping. This syndrome is noted as being more likely to appear soon after the start of treatment.

Safety Restrictions and Monitoring

The medication is contraindicated in patients with a known hypersensitivity to Mesalazine or salicylates (as 5-ASA is a salicylate derivative), and in individuals with severe renal impairment. The official label requires monitoring of renal function prior to and periodically during treatment, particularly in patients with pre-existing renal or hepatic impairment.

Overdose and Emergency Response

Overdose and When to Seek Help

This section outlines the officially documented descriptions of overdose for Mesalazine (Fivasa) and the mandatory actions required by regulatory authorities.

Overdose Scope

Classification Official Regulatory Statements
Documented Overdose Presentations Symptoms may mimic salicylate toxicity, including headache, hyperventilation, tinnitus, drowsiness, confusion, vertigo, diarrhea, and vomiting.
Physiological Systems Affected Potential for disorder of blood-pH (acid-base balance disorder), electrolyte imbalance, hyperthermia, and dehydration is noted. Severe internal organ involvement (e.g., myocarditis, nephritis, hepatitis) is a documented risk requiring immediate evaluation.
Population-Specific Notes The risk of adverse reactions may be greater for patients with impaired renal function; caution is recommended in those with impaired hepatic function.

Emergency Actions and Required Management

Action Area Official Regulatory Statements
When Urgent Help is Required Regulators instruct to contact your regional poison control centre for a suspected overdose. Immediate evaluation is mandated for signs of severe hypersensitivity.
Supportive Management Symptomatic treatment at hospital is required. Supportive measures, including correction of fluid and electrolyte imbalance, are specified. No specific antidote is known or documented.
Monitoring Requirements Close monitoring of renal function is required during the management of overdose.

The official overdose profile is defined by the compound's link to salicylate toxicity, which dictates the presentation and necessary supportive care. This classification mandates the symptomatic treatment at hospital and the necessary close monitoring of renal function, serving as the basis for all regulator-required emergency actions.

Therapeutic Uses of Fivasa

Fivasa (Mesalazine) is applied in addressing symptoms related to inflammatory or irritative states in the gastrointestinal tract. Its use is focused on managing mildly to moderately active ulcerative colitis and for maintaining remission.

Symptom Management and Therapeutic Focus

This medication is used to address conditions characterized by periods of heightened symptoms, such as an active flare-up. It helps address symptom clusters that may become intense or disruptive, including frequent diarrhea, rectal bleeding, and inflammation-related abdominal cramps. Beyond acute relief, the medication is used in situations involving recurrent or episodic manifestations to support the management of potential flares.

Long-Term Benefits and Clinical Context

Fivasa is utilized as an initial therapy for inflammation largely confined to the colon and rectum (colonic disease). It contributes to improved comfort and is used to help with the structural stabilization of the intestinal lining, thereby managing the potential for heightened physiological activity. This consistent therapeutic support assists during difficult episodes and helps improve day-to-day comfort.

Quick Fact: Relief for Acute Inflammation
It is used to help with symptoms that are driven by inflammation.

Eligibility and Restrictions for Use

Fivasa (Mesalazine) eligibility is strictly defined by regulatory documents based on patient health status, age, and known drug sensitivities. The medicine is contraindicated in several key populations.

Who Must Not Use Fivasa (Contraindications)

Absolute prohibitions exist for patients with a known hypersensitivity to mesalazine, any salicylate drug (such as aspirin), or the product's excipients. Fivasa must also not be used in patients diagnosed with severe renal impairment (kidney function) or severe hepatic impairment (liver function), as explicitly stated in the official labeling.

Eligibility by Age and Status

Population Eligibility Status (Regulatory)
Adults (ge 18 years) Approved for use under standard labeled conditions.
Pediatric Patients Use is generally restricted; safety and efficacy are not established in children under 5 years of age.
Pregnancy/Lactation Use is conditional upon a strict benefit-risk assessment, as the drug is known to pass into the placenta and breast milk.

Restricted Use and Caution

Use of Fivasa is restricted in patients with mild to moderate renal impairment and is generally not recommended in this group. Caution is also required for patients with a history of sulfasalazine allergy (due to cross-sensitivity risk) and those with pre-existing conditions like asthma or other chronic lung impairments.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Fivasa (Mesalazine) has documented interaction patterns based on regulatory prescribing information that primarily affect blood cell production, kidney function, and coagulation stability. These interactions are categorized as pharmacodynamic or exposure-modifying risks.

Co-administration with thiopurines (Azathioprine or 6-Mercaptopurine) carries an officially documented increased risk for severe blood disorders such as myelotoxicity. This is due to Mesalazine's documented effect of inhibiting the thiopurine methyltransferase enzyme, which raises the systemic exposure of the thiopurine's active metabolite.

Concurrent use with nephrotoxic agents, including Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), results in an increased risk of nephrotoxicity (kidney damage). This additive risk is officially noted to be greater in patients with existing renal impairment.

When co-administered with Coumarin-type anticoagulants (e.g., Warfarin), a potential for decreased anticoagulant activity exists, which requires close monitoring of Prothrombin Time. Furthermore, Mesalazine use officially causes analytical interference with specific methods for measuring urinary normetanephrine, resulting in spuriously elevated test results. For specific delayed-release Mesalazine formulations, administration with pH-altering agents like Antacids may alter the drug release profile.

Mechanism of Action

Dual Inhibition of Inflammatory Messenger Production

The core mechanism of Mesalazine (5-ASA) involves the inhibition of key enzymes in the inflammatory cascade: Cyclooxygenase ( COX) and 5-Lipoxygenase ( 5-LOX). This dual action restricts the cellular synthesis of pro-inflammatory mediators, such as prostaglandins and leukotrienes, thereby limiting the signal transduction that initiates fluid accumulation and leukocyte chemotaxis within the intestinal lining.


Modulation of Cellular Immune Signaling

Beyond enzyme inhibition, the drug acts as a specialized modulator by inhibiting the NF-kappa B transcription factor and activating the PPARgamma receptor. This mechanism is central to regulating the local immune response, as it leads to a reduction in the gene transcription for pro-inflammatory proteins ( TNF-alpha, IL-1beta), resulting in a functional downregulation of the localized immune activity at the tissue level.


Localized Antioxidant Tissue Protection

Mesalazine also possesses an antioxidant function, acting as a scavenger to neutralize high levels of Reactive Oxygen Species ( ROS) and free radicals generated by activated immune cells. This process reduces oxidative damage to the epithelial cell components and DNA of the intestinal mucosa, thereby maintaining the structural integrity of the mucosal barrier. The pharmacological action is topical and strictly concentration-dependent, relying on the continuous, direct contact of Mesalazine with the surface tissue.

Dosage and Administration Information

How Fivasa is Used: Official Administration Guidelines

Fivasa is an extended-release oral tablet formulation of mesalazine, and its usage is defined by specific administration rules to ensure the medicine reaches the lower bowel, its intended site of action.


Administration and Timing

Fivasa tablets are administered orally and the total prescribed daily dose is typically taken once a day. This frequency applies to both the initial phase of treatment (induction of remission) and the continuous phase (maintenance of remission).

Usage Instruction Domain Official Administration Principle
Dose Integrity The tablets must be swallowed whole and must not be crushed, split, or chewed.
Timing in Relation to Meals The tablets should be administered with food to support tolerance and consistent delivery.

Official Dosing Patterns

The required daily dosage of Fivasa is determined by the patient's treatment phase. For adults, the dosing logic establishes a shift between active treatment and long-term management.

  • Induction Dosing: The daily dose for initiating treatment during an active episode of mild-to-moderate disease ranges from 2.4 g to 4.8 g, taken once daily. This higher dose level is used for a specified short period, often up to eight weeks.
  • Maintenance Dosing: Following the induction phase, the dose is typically reduced to 2.4 g once daily for use as part of a long-term management plan to sustain remission.

Administration for specific populations, such as pediatric patients or those with existing kidney conditions, requires evaluation of patient status, particularly the assessment of renal function, prior to treatment initiation and periodically during use.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Fivasa (Mesalazine)

Fivasa is an oral formulation of Mesalazine, which was studied in official research contexts, primarily Randomized Controlled Trials (RCTs) and long-term observational analyses. The evidence base describes how the medicine was evaluated in its role related to chronic inflammation within the bowel lining.


Evidence for Use in Active Ulcerative Colitis Flares

Research was conducted using short-term, tightly controlled studies that focused on patients experiencing conditions characterized by fluctuating or episodic manifestations—specifically, mild to moderately active Ulcerative Colitis. These studies were evaluated in adult populations over periods typically lasting six to eight weeks. Findings describe patterns observed in the studies where individuals receiving Mesalazine treatment reported how symptoms evolved in the observed populations compared to those receiving a placebo. This research contributes to the broader evidence landscape by providing insight into short-term changes during a period of increased symptom activity.

However, these induction trials are focused exclusively on immediate outcomes. The evidence is limited in providing context for the long-term impact on the disease course beyond the initial short treatment window. Furthermore, these short-term studies do not fully address the response of individuals with severely active inflammation, and the results apply only to the populations studied (mild-to-moderate UC).


Evidence for Long-Term Maintenance of Remission

Mesalazine was studied for its role in conditions where symptoms may vary in intensity but are currently stable. The evidence for maintenance therapy comes from longer-duration RCTs and extensive systematic reviews, which were evaluated in adult patients already in a state of clinical remission. Research explored outcomes related to systemic or functional imbalance by monitoring the time elapsed before the condition was observed in a recurrence (Time to Relapse).

These studies examined the sustainability of the quiescent state, and the findings describe patterns related to relapse rates over a year compared to control groups. This long-term research contributes to the understanding of patient-reported outcomes during periods of continuous observation. Nevertheless, limitations are still emerging regarding real-world adherence, which can impact the interpretation of long-term outcomes.


Consistency and Gaps in the Research Evidence

Mesalazine was evaluated in a range of research contexts, with studies exploring outcomes related to both short-term active inflammation and long-term maintenance of a stable state. The overall evidence base has limited information about the full scope of long-term complications.

The comparative evidence is lacking for many head-to-head comparisons against treatments used today, meaning the evidence mainly describes findings from comparisons against placebo and other treatments studied at the time, and what remains uncertain regarding current therapeutic approaches.

Key Studies & References

  1. Label: MESALAMINE tablet, delayed release - DailyMed (Representative Regulatory Document)

Frequently Asked Questions (FAQ)

Common questions about Fivasa (FAQ)


Q: Can Fivasa be taken with food, or does it need to be taken on an empty stomach?

Official instructions for the administration of Fivasa state that the tablets should be taken with food. This practice is suggested to support consistent delivery of the medicine and improve how well it is tolerated.

Q: Are there any known interactions between Fivasa and alcohol?

Regulatory documents do not list a direct chemical interaction between Fivasa's active ingredient and alcohol. However, some official sources note that alcohol consumption can be associated with irritation in the bowel lining.

Q: Is use during pregnancy considered?

Use during pregnancy is conditional. Regulatory documents indicate that the decision for use is based on a benefit-risk assessment. Official information notes that the drug crosses the placenta. Some studies reviewed by regulatory bodies note associations with outcomes like preterm birth, which are also often linked to the underlying inflammatory condition.

Q: How is Fivasa typically stored?

Fivasa should be stored at Controlled Room Temperature (approximately 20 to 25 C or 68 to 77 F). The tablets must be protected from moisture, light, and freezing temperatures to maintain the product's quality.

Q: Is Fivasa the same type of medicine as other treatments for the same condition?

Fivasa’s active ingredient, mesalazine, belongs to a specific group of anti-inflammatory medicines called aminosalicylates. This pharmacological class is distinct from other types of treatments used for chronic bowel inflammation, such as certain steroids or immunosuppressant drugs.

Q: How quickly do research studies describe changes after starting Fivasa?

Studies focusing on the initial treatment phase (induction of remission) commonly evaluate patient outcomes over a period of six to eight weeks. Some clinical studies examining specific symptoms, like rectal bleeding, have observed changes within the first two weeks of treatment.

Q: Are there any common misconceptions about how Fivasa works?

Official descriptions highlight that the drug's action is primarily localized and topical, meaning it acts directly on the surface lining of the lower bowel. This is distinct from some other medications that are designed to have a widespread systemic (body-wide) effect.

Q: What should I do if I miss a dose of Fivasa?

Regulatory guidance advises taking the dose as soon as it is remembered, unless it is nearly time for the next scheduled dose. If that is the case, the missed dose should be skipped, and the regular schedule should be resumed. Official guidance states that two doses should not be taken together.

Q: Are there any long-term side effects associated with Fivasa use?

While the overall safety profile is known from numerous studies, official documentation reports that the research evidence currently has limited information about the full scope of potential long-term complications beyond the periods studied in the primary clinical trials.

Q: Why do official documents refer to Fivasa as a 'maintenance treatment'?

The term is used because regulatory-supported research demonstrated its role in the long-term management of the condition. After an active episode is stabilized (remission), Fivasa is used continuously to help sustain that stable state and reduce the chances of the condition returning (relapse).

Q: Is Fivasa available as a generic medicine?

Fivasa is a specific brand name. However, its active ingredient, mesalazine (5-aminosalicylic acid), is available in the United States and other regions as an FDA-approved generic product and under various other brand names and formulations.

Q: What happens if I stop taking Fivasa suddenly?

Official documents describe Fivasa as a maintenance treatment intended for continuous use. Discontinuing the medicine, particularly during the long-term phase, is a factor that has been associated with an increased rate of the underlying condition returning (relapse).

Q: How does Fivasa compare to other similar drugs in terms of research evidence?

The official overview of the evidence notes that there is currently a lack of direct, head-to-head comparative evidence against many of the newest treatments used today. Studies mainly describe findings from comparisons against an inactive substance (placebo).

Q: Are there any specific lifestyle changes recommended while using Fivasa?

The official drug labeling does not specify mandatory diet or lifestyle changes. However, regulatory documents note the importance of adequate fluid intake during treatment to support overall kidney function.

Q: Does Fivasa cause weight gain?

Regulatory documents list weight gain as a reported adverse reaction. However, its official frequency is noted as Incidence Not Known, meaning it is an event reported outside of clinical trials, and its statistical likelihood has not been definitively established.

Q: Is it common to feel tired when first starting Fivasa?

The adverse reaction of tiredness or malaise is reported in regulatory documents. However, this symptom is generally listed in the frequency categories of 'less common' or 'frequency not reported,' and is not considered one of the most common side effects.

Q: Can Fivasa affect fertility in men or women?

Preclinical data reviewed by regulatory bodies generally indicate no special hazard for humans regarding fertility or toxicity to reproduction. Studies performed in animals found no significant adverse effects on reproductive health.

Q: Who is generally eligible to be prescribed Fivasa?

Fivasa is approved for use in adults (age 18 and older) who have been diagnosed with mild-to-moderate active Ulcerative Colitis or are in a state of remission requiring long-term maintenance therapy.

Q: What is the recommended period of treatment with Fivasa?

The period depends on the treatment goal: Induction Dosing is typically for a specified short period, often up to eight weeks, to manage an active episode. Maintenance Dosing is intended for long-term or continuous use to help sustain a stable state.

Q: What should I look out for as a sign that Fivasa is working?

Regulatory research outcomes focus on signs of reduced inflammation and the stabilization of the condition. For the patient experience, the goal is aligned with a pattern of reduced symptoms, such as abdominal pain, rectal bleeding, and the frequency of bowel movements.

Q: Are there any foods I should avoid while taking Fivasa?

The official drug labeling does not list any specific foods that must be avoided while taking Fivasa.

Q: How long does Fivasa stay in the system after the last dose?

The drug's active component is substantially excreted by the kidney. Official pharmacokinetic data provide the elimination half-life, which describes the rate at which the concentration of the drug is reduced in the body by half.

Q: Is Fivasa a prescription-only medicine?

Yes, Fivasa is classified as a prescription-only medicine in all regions where it is officially approved, meaning it must be prescribed by a licensed healthcare provider.

Q: Does Fivasa impact the immune system?

Yes, official documents describe that the drug acts as a specialized modulator by inhibiting a transcription factor and activating a receptor. This mechanism is central to regulating the local immune response within the intestinal lining, which ultimately reduces the level of inflammation.

Q: Is Fivasa considered a high-risk medication?

Fivasa is associated with a known safety profile, including the potential for serious, though infrequent, adverse reactions such as nephrotoxicity (kidney damage) and an Acute Intolerance Syndrome. Its use is contraindicated in patients with severe kidney or liver impairment.

Q: Why is Fivasa sometimes prescribed with other medications?

Fivasa is sometimes prescribed alongside other medications, such as thiopurines. This combination is known to cause a pharmacological interaction that can potentially increase the active metabolite of the co-administered drug, a strategy some professionals utilize for disease management.

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

The use of Fivasa is supported by findings from official research contexts, primarily Randomized Controlled Trials (RCTs). These short-term and long-term studies, along with systematic reviews, are the foundation for its regulatory approval.

Q: Does Fivasa change the symptoms or just prevent flare-ups?

The medicine is studied for two primary roles: Induction Dosing is intended to help change the course of symptoms during an active flare-up, while Maintenance Dosing is intended for the long-term prevention of future flare-ups, demonstrating both uses.

Q: Does Fivasa affect mood or mental health?

Official documentation lists certain psychiatric adverse reactions, such as insomnia (uncommon) and post-marketing reports of depression and anxiety or nervousness in some individuals.

Q: Is it okay to take Fivasa if I have diabetes?

Official drug documentation does not list diabetes as a specific contraindication or a necessary precaution that requires specific monitoring or dose adjustment in a patient with an existing diagnosis.

Q: Are there different strengths or formulations of Fivasa available?

Fivasa is one specific brand of mesalazine extended-release oral tablet. Other mesalazine products are available in different strengths and various formulations, including delayed-release tablets, capsules, suppositories, and enemas.

Q: Why is Fivasa sometimes given in a delayed-release form?

The medication is formulated with a specialized coating to ensure delayed and controlled release of the active ingredient. This is necessary to deliver a high concentration of the drug directly to the lower gastrointestinal tract, which is the site of inflammation.

Q: Does Fivasa have any impact on blood pressure?

Official documents have noted a rare post-marketing report of increased blood pressure in some patients. In very rare cases, cardiac hypersensitivity reactions (inflammation of heart tissue) have also been reported.

Q: Can Fivasa cause changes to skin or hair?

Yes, regulatory documents list rash and pruritus (itching) as Common adverse reactions. Hair loss (alopecia) and photosensitivity (sensitivity to sunlight) are listed as less common or rare reactions.

Q: Is it possible to overdose on Fivasa?

Yes, official documentation includes an overdose section, although it notes that the potential for severe systemic toxicity is low due to the drug's localized action. Symptoms of overdose are typically non-specific, but if a suspected overdose occurs, immediate medical attention is necessary.

Q: Do official documents mention Fivasa being used for other conditions?

The active ingredient, mesalazine, is officially approved for the treatment of various inflammatory bowel conditions. In addition to Ulcerative Colitis, some official documents also reference its use in managing Crohn's disease.

Q: What is the meaning of the condition Fivasa is approved to treat?

The drug is used to treat Ulcerative Colitis (UC), which is a chronic disease that causes inflammation and sores (ulcers) in the lining of the colon and rectum. This typically leads to symptoms like abdominal pain and bloody diarrhea.

Q: Does Fivasa have a black box warning from the FDA?

Mesalazine products do not typically carry a Boxed Warning (Black Box Warning) from the FDA. However, they do have a detailed list of warnings and precautions regarding serious potential events, such as renal impairment and Acute Intolerance Syndrome.

Q: Can men and women have different experiences with Fivasa?

While official labels do not specify differences, general scientific reviews note that biological sex can influence how a drug is processed by the body (pharmacokinetics). This could potentially lead to differences in how the medicine is absorbed, distributed, and eliminated.

How should Fivasa be stored and disposed of?

How to Store and Dispose of Fivasa (Mesalazine Tablets)

Fivasa (mesalazine) tablets must be stored according to regulatory specifications to maintain product quality and stability.


Official Storage Requirements

Requirement Condition
Temperature Store at 20° to 25°C (68° to 77°F) (Controlled Room Temperature).
Environmental Protect from moisture and light; Do not freeze (as stated in some labels).
Packaging Keep in the original package and keep the container tightly closed (if supplied in a bottle).
Child Safety Keep this medicine out of the sight and reach of children.

Disposal Instructions

Unused or expired Fivasa must be disposed of in accordance with local requirements for unused medicines. The product is not on the list of medicines recommended by the FDA for disposal by flushing down the toilet. Disposal should follow approved community take-back programs or general household trash guidelines for non-hazardous drugs.

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

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