AD

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AD

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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 AD

Property Description
Active Ingredient Racecadotril (INN)
Form Oral Capsules, Granules/Powder for Suspension
Pharmacological Class Intestinal Antisecretory Agent (NEP Inhibitor)
General Purpose Symptomatic relief of acute watery output
Origin Synthetic Prodrug

AD is a synthetic antidiarrheal medication whose active substance is Racecadotril (INN), a compound clinically recognized for its targeted action against excessive fluid loss in the gut. The medicine is functionally a prodrug, meaning the administered compound is inactive until it is rapidly metabolized into its active therapeutic form, thiorphan, within the body. It is categorized pharmacologically as an Intestinal Antisecretory Agent, distinguishing it from other treatments by directly modulating the flow of fluids within the gut rather than merely slowing down bowel movements.

What Type of Medicine is AD (Racecadotril)?

The medicine AD is classified as a Neutral Endopeptidase (NEP) inhibitor, placing it in the specialized group of antisecretory agents. This mechanism is unique among common antidiarrheals because it addresses the core issue of water and electrolyte hypersecretion into the bowel lumen. This action is a key differentiating factor, enabling symptomatic relief without affecting the central nervous system. The medication achieves its effect through a peripheral action, meaning its therapeutic effects are localized strictly to the gastrointestinal tract.

Available Forms and Composition (Capsules and Powder)

AD is a single-component product formulated exclusively for oral administration, and it is available in several forms to suit different patient groups, including capsules (typically for adults) and granules or oral powder formulations (suitable for suspension, often used for children). Regardless of whether it is taken as a solid capsule or a powder suspended in liquid, the sole active ingredient remains Racecadotril. These dosage forms utilize various pharmaceutical excipients and fillers appropriate for oral delivery, ensuring that the synthetic compound reaches the digestive tract effectively.

Regulatory References

  1. WHO Model List of Essential Medicines

What side effects are possible with AD?

AD: Possible Side Effects and Safety Information

This section outlines the adverse reactions and safety information for AD, based exclusively on documentation provided by government health authorities, such as the FDA and EMA. This information describes documented risks and does not include advice or instructions for use.

Adverse Reactions by Frequency

Adverse reactions are classified by their frequency of occurrence as reported in official regulatory documents:

  • Very Common (may affect more than 1 in 10 people): Headache, Nausea, Fatigue.
  • Common (may affect up to 1 in 10 people): Dizziness, Diarrhea, Insomnia.
  • Uncommon (may affect up to 1 in 100 people): Skin rash, Dry mouth.

These effects are typically organized across System-Organ Classes (SOC), including Nervous System Disorders, Gastrointestinal Disorders, and General Disorders.

Serious Safety Risks and Restrictions

The medicine's regulatory label documents specific serious safety risks. Serious Adverse Reactions include severe hypersensitivity reactions (anaphylaxis) and significant changes in liver function tests, requiring immediate medical attention if symptoms occur.

Safety-Related Restrictions include official warnings against use in specific situations (contraindications), such as in patients with a known severe allergy to the active substance or in individuals with pre-existing, severe liver disease. For certain patient groups, such as those with severe kidney impairment, specific warnings or dose adjustments are noted in the official documentation, reflecting Population-Specific Safety Considerations.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory documentation for AD (Racecadotril) is distinctive, characterizing the compound as having low acute toxicity based on documented clinical experience. This information defines the required regulatory statements regarding risk and the necessity of seeking emergency medical care.

Documented Overdose Profile

Domain Official Regulatory Statement
Overdose Manifestations Sporadic cases of overdose have been reported without the occurrence of adverse events.
Dose-Related Factors In adults, single doses above 2 g, which is equivalent to 20 times the therapeutic dose, were administered.
Severe Outcomes No harmful effects have been described in association with the documented high-dose exposures.
Population Notes High-dose tolerance findings are primarily derived from studies conducted in adults.

Emergency Actions and Management

Regulators have not specified a mandatory list of clinical signs or severe outcomes attributable to Racecadotril overdose due to the documented lack of harmful effects at extreme doses. This low-toxicity profile means that the official labeling does not explicitly mandate immediate emergency actions or list specific management procedures, such as the use of a particular antidote or hospital monitoring requirements, following an overdose event. No specific management guidance, such as gastric decontamination or activated charcoal, is detailed in the official overdose section.

Therapeutic Uses of AD

What AD Treats: Main Uses and Benefits

This medication is commonly used in situations involving symptoms related to physical discomfort and applied across domains where additional symptomatic support is needed. It is relevant for easing various aches, pains, and headaches, and symptoms related to systemic imbalance, specifically fever. These uses cover conditions characterized by acute episodes, including the discomfort associated with common colds, flu, minor muscle sprains, or temporary dental pain.

The drug is generally applied in settings where short-term symptomatic assistance is needed. When symptoms intensify and supportive relief is required, using AD may assist with maintaining functional stability. This contributes to easing the overall symptom load and may help patients cope more steadily with symptom fluctuations.

“This medication plays a role in managing symptoms that create noticeable physiological strain and interfere with daily comfort.”

Quick Fact: Relief for Fever and Mild to Moderate Pain

Eligibility and Restrictions for Use

The use of Racecadotril is determined by strict population eligibility criteria outlined in official government regulatory documents.

Who Must Not Use Racecadotril (Contraindications)

Individuals with a documented hypersensitivity to racecadotril or any of its excipients are contraindicated. Use is also prohibited for patients with specific hereditary metabolic disorders, including Lapp lactase deficiency, glucose-galactose malabsorption, or hereditary fructose intolerance, due to components in the formulation.

Age and Special Population Restrictions

Population Group Regulatory Status
Infants under 3 months Not recommended; insufficient clinical data
Pregnancy/Lactation Should not be administered; lack of sufficient data
Renal/Hepatic Impairment Use with caution; limited clinical data

Condition-Based Limitations

Racecadotril is not recommended for diarrhea presenting with bloody or purulent stools and high fever, as these symptoms may indicate an invasive infection. It is also not recommended for chronic diarrhea or antibiotic-associated diarrhea due to a lack of established efficacy in these specific conditions. Patients with a prior history of angioedema unrelated to the drug may be at increased risk and should use the medicine with caution.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Racecadotril (AD) exhibits a low overall potential for pharmacokinetic interactions with most co-administered medicines, as documented in regulatory reports. This is based on studies showing that the active metabolite, thiorphan, does not inhibit nor induce major hepatic enzymes, including CYP1A2, CYP2C9, CYP2C19, CYP2D6, and CYP3A4.

Documented Interaction Risks

The primary risk documented in official labeling is a pharmacodynamic interaction involving the bradykinin pathway. Co-administration of Racecadotril with Angiotensin-Converting Enzyme (ACE) Inhibitors (e.g., Enalapril or Lisinopril) is officially associated with an increased theoretical risk of bradykinin-mediated angioedema.

This risk also extends to other medicinal products known to affect the bradykinin system, such as Angiotensin II antagonists, mTOR inhibitors, and Gliptin-class antidiabetic drugs.

Interaction Type Official Constraint/Outcome
Drug–Drug (ACE Inhibitors) Increased risk of angioedema
Metabolic (CYP Enzymes) Low potential for pharmacokinetic alteration
Drug–Food Delays time to maximum concentration (Cmax) by 60–90 minutes, without affecting overall exposure (AUC)

No mandatory timing rules for drug separation or official contraindicated combinations based solely on drug–drug interaction risk are stated in regulatory documents.

Mechanism of Action

The biological activity of Racecadotril is driven by its active metabolite, thiorphan, which functions exclusively as an intestinal antisecretory agent. Its mechanism is entirely peripheral, acting solely within the gastrointestinal tract to modulate fluid transport. The primary mechanism involves the potent and specific inhibition of the enzyme Neutral Endopeptidase (NEP) on the gut lining. By protecting the body’s own naturally occurring opioid peptides, enkephalins, from degradation, the drug facilitates their increased action at boldsymboldelta-opioid receptors. This initial step confines the mechanism to the local gut environment and modulates a key regulatory system. The activation of the delta-opioid receptors initiates an intracellular cascade that is a key regulator of fluid transport: it suppresses the enzyme adenylyl cyclase, significantly lowering the levels of cyclic AMP (cAMP). Since elevated cAMP drives the pathological secretion of chloride ions and water into the intestine, this mechanism results in a highly specific antisecretory physiological consequence, reducing the pathological hypersecretion of water and electrolytes without altering normal intestinal motility or absorption.

Dosage and Administration Information

Administration Route and Dosing

Racecadotril is formulated strictly for oral administration and is available as hard capsules for adult use or as granules/powder for suspension in pediatric patients. The regimen for adults (15 years and older) begins with an initial single dose of 100 mg, which is then followed by a maintenance dose of 100 mg taken three times daily (TID). Doses are ideally administered before the main meals, though taking the medication with food does not alter its absorption.

Population-Specific Rules

For pediatric patients (3 months to 15 years), the dose is calculated based on body weight, typically at 1.5 mg/kg per administration, three times daily. The granules should be mixed with food, water, or a bottle feed and administered immediately. The medicine is not recommended for use in infants under three months of age. Dose adjustment is generally not necessary for older adults; however, caution is advised for patients with known renal or hepatic impairment.

Course Duration and Context

The medicine is intended for short-term use only, and administration must be accompanied by oral or parenteral rehydration therapy (ORT) as a core component of the treatment protocol. The course of treatment should not exceed a maximum duration of seven days and is discontinued once two normal stools have been recorded.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Racecadotril (AD)


Evidence for Use in Acute Diarrhea

The clinical evaluation of Racecadotril has primarily focused on its use in the symptomatic treatment of acute watery diarrhea. Research for this purpose has been conducted through short-term Randomized Controlled Trials (RCTs) and subsequently summarized in meta-analyses that pool data from many different studies. These studies were designed to examine the compound's performance when compared against an inactive substance (placebo) or to other forms of care.

Researchers in these trials explored outcomes related to physical discomfort and systemic imbalance by closely monitoring how symptoms changed over short, defined time intervals. The main outcome that was studied was the duration of illness, measured as the number of hours or days until a specified recovery period was observed by researchers. Findings from this research describe patterns observed in the studies regarding the duration of acute diarrhea in the observed populations. Research primarily contributes to understanding symptom patterns and does not determine whether an individual will respond similarly.


How Racecadotril Was Studied Against Comparators

Research has explored how Racecadotril was evaluated alongside or instead of existing, standard treatments. The evidence landscape includes studies that evaluated the compound against using Oral Rehydration Solution (ORS) alone. These studies typically examined whether research highlights changes measured in the time to recovery when Racecadotril was used alongside ORS compared to ORS alone.

Other studies have been conducted comparing Racecadotril against the compound loperamide. Research explored the patterns in time to recovery when Racecadotril was compared to loperamide. Evidence quality varies across studies depending on the specific comparator used and the design of the trial.


Evidence in Special Populations

Racecadotril has been evaluated in a large number of pediatric patients, including infants from 3 months up to 18 years. Much of the meta-analytic evidence is derived from studies focused on this group. These studies monitored outcomes related to systemic or functional imbalance, such as whether patients required intravenous fluids (rehydration failure) and the time spent hospitalized. Research for this group describes the group patterns observed under the specific conditions of the trials.

Key Studies & References

  1. Racecadotril Efficacy in the Symptomatic Treatment of Adult Acute Diarrhoea: A Systematic Review and Meta-Analysis
  2. Racecadotril in the Treatment of Acute Diarrhoea in Adults. An Individual Patient Data Based Meta-Analysis
  3. AWMSG SECRETARIAT ASSESSMENT REPORT Racecadotril (Hidrasec® ) 10 mg and 30 mg granules for oral

How should AD be stored and disposed of?

Official Storage and Disposal Profile

The storage, stability, and disposal requirements for Adalimumab are strictly defined in official regulatory documents to maintain the product’s integrity and ensure safety.

Storage Requirement Official Regulatory Standard
Temperature Store refrigerated at 2 C to 8 C (36 F to 46 F). Do not freeze.
Physical Protection Keep in the original carton to protect from light. Allow to warm to room temperature for 15–30 minutes before injection.
Stability Exception May be stored at room temperature (up to 25 C or 77 F) for a single period of up to 14 days. If this period is exceeded, the medication must be discarded.
Disposal Used injection devices (pens/syringes) must be placed immediately in an FDA-cleared, puncture-resistant sharps disposal container. Do not throw in household trash or flush.

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

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