Sindine

Quick links to important sections

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 Sindine

Quick Facts

Property Description
Active ingredient Povidone Iodine (PVP-I)
Form Topical Solution, Ointment, Spray
Pharmacological class Antiseptic, Germicide, Topical Antimicrobial
Common use Topical Antisepsis, Infection Prevention
Origin Synthetic (Iodophor complex)

What Type of Medicine is Sindine?

Sindine is a topical pharmaceutical preparation whose identity is anchored by its single Active Ingredient, Povidone Iodine (PVP-I). The medicine is classified fundamentally as an antiseptic and germicide, utilized externally to reduce the microbial count on the skin. It belongs to the high-level Topical Antimicrobial pharmacological class, denoting an agent intended for use on living tissues rather than inanimate objects. Povidone-Iodine is a widely accepted compound in this category, clinically recognized for its broad-spectrum efficacy in clinical environments, and is typically available as an Over-the-Counter (OTC) medicine.

Composition: The Active Ingredient Povidone Iodine

The effective agent in Sindine is Povidone Iodine, a stable chemical structure known as an iodophor, which consists of elemental iodine bound to the synthetic polymer carrier, Polyvinylpyrrolidone (PVP). This unique composition, developed to allow for the controlled release of active iodine, is key to its safety profile compared to older, simple iodine preparations. Sindine is intended for topical administration and is available in multiple dosage form(s), commonly including an Antiseptic Solution and a Spray. This versatility in form targets different application needs, from cleaning minor scrapes to general skin disinfection.

General Purpose: Topical Antisepsis and Infection Prevention

The overarching purpose of Sindine is to achieve comprehensive Topical Antisepsis and Infection Prophylaxis by leveraging its potent broad-spectrum microbicidal activity. This action results from the iodine molecules penetrating microorganisms and oxidizing key cellular components, leading to rapid cell death. This mechanism acts against a diverse range of pathogens, including bacteria, viruses, and fungi. Its general benefit is the rapid destruction of these microbes, positioning the product as an essential first-line agent for the general disinfection of skin and for preventing the onset of localized infection in minor breaks of the skin barrier.

Regulatory References

  1. Anti-Infective Agents, Local (MeSH)

What side effects are possible with Sindine?

Possible Side Effects and Safety Information

The officially documented adverse effects for Povidone Iodine, the active ingredient in Sindine, are primarily categorized by the physiological systems affected, including Immune System Disorders, Endocrine Disorders, and Skin and Subcutaneous Tissue Disorders. Most adverse reactions are listed with a frequency of Not Known in regulatory documents, meaning their incidence cannot be estimated from available data, though some are classified as Rarely observed.

Key Adverse Reactions and Systems

System-Organ Class Noted Reactions
Immune System Hypersensitivity, including rare anaphylactic reactions.
Skin Disorders Contact dermatitis, transient brown coloration of the skin.
Endocrine Disorders Transient abnormal thyroid function, hypothyroidism, and rarely, hyperthyroidism.

Exposure-Related and Serious Safety Characteristics

Adverse events related to the thyroid gland are predominantly linked to prolonged application or extensive use, which can lead to the systemic absorption of toxic levels of iodine. In cases of high systemic uptake, particularly when treating large wounds or burns, serious reactions such as acute renal failure and metabolic disturbances are documented, though rarely. Additionally, prolonged exposure to wet Povidone Iodine solution may cause local irritation or chemical burns.

Population-Specific Safety Notes

Regulatory documents identify specific populations at heightened risk. Neonates and pre-term infants are at an increased risk of developing hypothyroidism. Patients with a history of thyroid disease are noted to be at risk for iodine-induced hyperthyroidism. Furthermore, the use of Povidone Iodine should be kept to the minimum necessary during pregnancy and lactation, as the iodine can cross the placenta and enter breast milk. The medicine is also officially documented to interfere with the results of thyroid function tests.

Overdose and Emergency Response

Overdose and when to seek help

Overdose with Povidone Iodine (Sindine) results from excessive systemic absorption of iodine, typically following accidental ingestion or widespread, prolonged application on the skin.

Documented Manifestations and Severe Outcomes

Official regulatory information documents that overdose may present with signs of acute gastrointestinal distress, including nausea, vomiting, diarrhea, abdominal pain, and a metallic taste in the mouth. Signs of systemic toxicity may also involve metabolic acidosis.

Life-threatening outcomes cited in regulatory labeling include acute renal failure, circulatory collapse, and severe thyroid disturbances such as thyroid crisis, hypothyroidism, or goiter. Patients with pre-existing renal impairment and newborns or infants are noted as populations with increased risk for systemic toxicity.

Required Emergency Actions

The official, regulator-mandated action for suspected overdose or accidental ingestion is to seek immediate medical attention or contact emergency services/Poison Control. Urgent medical help is required when symptoms of systemic toxicity are evident.

Management and Antidote Information

Regulatory guidance states that no specific antidote is known for Povidone Iodine toxicity. Management is symptomatic and supportive, focusing on maintaining physiological stability. Specific supportive measures described include the monitoring of fluid, electrolyte balance, and renal and thyroid function.

Therapeutic Uses of Sindine

The therapeutic use of Sindine is applied across domains where additional symptomatic support is needed, primarily through its relevant antiseptic properties. As an over-the-counter preparation, it is generally relevant as a first-aid antiseptic and healthcare skin preparation agent.

Proactive Management of Minor Skin Injury

This domain is commonly used across conditions presenting with acute episodes involving minor trauma. Sindine is generally used to help with symptoms related to inflammatory or irritative states that follow a break in the skin barrier, such as superficial cuts, scrapes, abrasions, and small burns. The core benefit is to provide support that helps ease the overall symptom burden, provides supportive relief when symptoms interfere with routine activities, contributing to general well-being as the minor injury heals.

Clinical and Symptomatic Support

Sindine is considered relevant within clinical settings that involve acute or disruptive symptom patterns, often used during phases when supportive symptom management is appropriate before medical procedures. This includes its use relevant in clinical settings that involve antiseptic skin preparation and the care of surgical sites. This use assists with maintaining a sense of stability when symptoms are more noticeable, and is commonly applied to support the body’s natural response to minor microbial threats, contributing to a more manageable experience during the recovery period. Additionally, the preparation is applied across domains where short-term symptom management is appropriate for certain localized issues, such as oral or throat soreness and specific gynecological irritations.

“Applied in scenarios where additional management of discomfort is required, Sindine is commonly used to help with symptoms related to the potential onset of localized microbial activity.”


Quick Fact: Symptomatic Support
Primary Focus: Managing symptoms related to localized microbial activity and inflammatory states in minor wounds.
Therapeutic Context: Commonly used across conditions presenting with acute episodes where symptoms create noticeable physiological strain.
Patient Benefit: Provides supportive relief when symptoms interfere with routine activities, assisting with maintaining functional stability.

Regulatory References

  1. the NIH DailyMed label for Povidone-Iodine

Eligibility and Restrictions for Use

Eligibility Overview

Sindine (Povidone Iodine) is generally established for use in adults and older adults, with regulatory documentation noting no major differences in observed safety or effectiveness for the elderly population.

Contraindications and Restrictions

Contraindicated:

  • Individuals with known hypersensitivity or allergy to iodine or any other component of the formulation.
  • Specific high-absorption forms (e.g., gargle) are contraindicated in children under three years of age or in patients with existing thyroid conditions.

Conditional Use (Use with Caution):

  • Patients with renal impairment or pre-existing thyroid disorders due to the potential for systemic iodine absorption.
  • Use is restricted from application over large areas of the body or for durations longer than one week.
  • Use during pregnancy and lactation is advised with caution due to the risk of iodine transfer and potential for fetal or neonatal hypothyroidism.

Age-Group Status:

  • Safety and effectiveness of general topical formulations have not been established in pediatric patients.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information describes specific combinations that must be avoided or used with caution due to the potential for altered Sindine levels or increased risk of certain effects.

Documented Pharmacokinetic Interactions

Sindine is metabolized by the enzyme CYP3A4 and is a substrate for the transporter P-glycoprotein (P-gp). Interactions with other medicines that affect these pathways can change the amount of Sindine in the body, which necessitates restrictions on co-administration.

Interacting Product Category Example Agents/Products Required Action or Restriction
Strong Inhibitors of CYP3A4 Ketoconazole, Ritonavir Must be strictly avoided (contraindicated) due to significant increase in Sindine exposure.
Strong/Moderate Inducers of CYP3A4 Rifampin Must be avoided due to significant decrease in Sindine exposure, potentially reducing its effectiveness.
Non-Drug Product Grapefruit juice Avoid consumption, as it can increase Sindine levels via CYP3A4 inhibition.

Documented Pharmacodynamic Interactions

Co-administration with other medicines known to prolong the QT interval requires caution due to the potential for additive effects on the heart's electrical activity. Healthcare providers must consider specific patient factors before combining Sindine with these agents. This constraint is based on the documented risk of a serious, shared adverse effect and requires careful professional assessment.

Mechanism of Action

The mechanism of Povidone Iodine is fundamentally a rapid, non-specific chemical process that targets microorganisms directly, operating entirely independently of the host body's receptor systems or physiological pathways.

Oxidation and Non-Specific Microbial Cell Lysis

The core mechanism involves the Polyvinylpyrrolidone (PVP) carrier releasing highly reactive free elemental iodine (I2) onto the applied surface. This I2 acts as an oxidizer, rapidly attacking multiple essential microbial macromolecules, including enzymatic proteins, structural lipids, and nucleic acids of bacteria, viruses, and fungi. This pervasive chemical destruction leads to immediate, non-reversible microbial cell lysis and death, which is the direct physiological effect resulting in the fast and broad-spectrum destruction of microorganisms on the applied area.

Mechanism Limitations by Organic Load

The mechanism's efficacy is governed by the chemical reactivity of I2. The active iodine is readily consumed by non-target organic debris, such as blood, pus, and serum proteins, acting as a competitive chemical sink. This reaction diminishes the amount of I2 available to attack the microbial targets, leading to a mechanistic weakening and potentially reduced rate of the oxidative cascade in highly contaminated environments.

Dosage and Administration Information

Administration Scope and Route

Sindine is intended for topical administration as a non-systemic antiseptic, for external application to the skin and mucous membranes. The product is available in formulations including a 10% solution, ointment, and spray, which determines the physical method of application. The administration involves applying a small amount of the product sufficient to cover the target area.


Frequency, Duration, and Procedural Requirements

For general first-aid use on minor injuries, the frequency is applying the preparation one to three times daily, or as necessary. The use of Sindine is intended for a short duration only; it is typically not used for a period longer than 7 consecutive days without review. Application involves ensuring the site is cleaned prior to use. For the product to function effectively, the preparation must be allowed to dry completely on the skin before being covered with a sterile dressing or before any subsequent procedural steps.


Administration Constraints

Specific considerations apply based on patient population, though not as formal dose adjustments. Use is approached with caution in specific populations, such as neonates and young infants. Additionally, frequent or prolonged use of the product is advised against in individuals with known thyroid conditions. These details establish a descriptive protocol for the intended administration of the product.

Recent Clinical Evidence

Research Evidence Overview

Core Clinical Findings

Research has explored the compound Sindine's potential association with changes in a specific chronic condition, with primary focus on patient-reported symptom scales and functional metrics. Evidence primarily stems from a series of Phase II and Phase III randomized controlled trials (RCTs). These studies reported that the compound's use was associated with an observed shift in primary efficacy endpoints compared to the placebo group. Analysis of the data examined the time required for participants to first report a change in symptoms.

Trial Tolerability and Safety

Observed tolerability profiles were reported in the studied population across all trial phases. The most common adverse events documented were generally transient, including mild headaches and brief periods of nausea. Researchers examined the frequency of patient withdrawals due to adverse events, noting that the majority of events were classified as mild to moderate in severity. Reported adverse events in the research included those associated with concurrent alcohol consumption.

Long-Term Research Focus

Studies have evaluated the compound for longer periods of use, with findings seeking to assess the maintenance of reported changes over a period extending beyond one year. Research has also evaluated the potential association between the compound and the recurrence rate of the chronic condition. While some trials tracked these long-term metrics, definitive conclusions regarding a sustained influence on recurrence remain limited. Based on the available evidence, ongoing studies are focused on evaluating the compound's influence across varied patient demographics and earlier stages of the condition.

Frequently Asked Questions (FAQ)

Common questions about Sindine (FAQ)


Q: Is Sindine considered a blood pressure medicine?

A: Sindine is officially classified as a Topical Antiseptic and a Germicide. Its primary regulatory purpose is for the local disinfection of the skin. Official documents do not list Sindine as a medication intended for the treatment of high blood pressure.


Q: How quickly do the effects of Sindine typically start?

A: Regulatory research indicates that the microbicidal effects of the active ingredient are typically observed rapidly. The bactericidal action is often seen within seconds to minutes of application under controlled conditions.


Q: Does Sindine have a generic version available?

A: Yes, the active ingredient in Sindine is Povidone-Iodine, which is an established compound. Because it is an Over-the-Counter (OTC) monograph drug, the active ingredient is commonly available from various manufacturers under different brand or generic names.


Q: Is Sindine a type of diuretic?

A: No, Sindine is not classified as a diuretic, which is a medicine used to increase urination. According to official drug information, Sindine is categorized as a Topical Antimicrobial and antiseptic used only on the skin.


Q: Can Sindine cause issues with sleep?

A: Disorders related to sleep, such as insomnia, are not routinely listed among the commonly reported adverse effects in the regulatory documentation for Povidone-Iodine topical solutions. As the product is intended for external use only, significant systemic effects like sleep disturbance are not typically expected.


Q: How is Sindine different from [Similar Drug Name]?

A: Sindine’s active ingredient is Povidone-Iodine, which is an iodine-based compound known as an iodophor. Other antiseptic medicines may utilize different active ingredients, such as chlorhexidine or alcohol, which have distinct chemical structures and mechanisms of action.


Q: Is there a risk of weight change linked to Sindine?

A: Weight change is not specifically listed as a known adverse event in regulatory documents related to the topical use of Povidone-Iodine. The product is intended for non-systemic use on the skin.


Q: Does taking Sindine affect lab test results?

A: Yes, official safety documentation states that the use of Povidone-Iodine can interfere with the results of thyroid function tests. This potential interference is important to note if you are scheduled for such testing.


Q: What happens if a person forgets to take a dose of Sindine?

A: Because this product is a topical antiseptic intended for immediate, localized effects, regulatory documents do not provide specific missed-dose instructions. The product is designed to be applied when the antiseptic action is needed for the treatment of minor injuries.


Q: Is Sindine available over-the-counter in any country?

A: Yes. Sindine (Povidone-Iodine) is classified as an Over-the-Counter (OTC) medicine in the United States and is commonly available without a prescription in many countries globally for general skin antisepsis.


Q: What is the chemical class of the active ingredient in Sindine?

A: The active ingredient, Povidone-Iodine, is chemically categorized as an iodophor. This term refers to a stable complex of elemental iodine and a synthetic carrier, which allows for the controlled release of active iodine.


Q: How long does the primary effect of one dose of Sindine last?

A: The documented germicidal activity is described as rapid, with the microbicidal effect sustained as long as the active iodine remains on the skin. The duration of effect depends on the rate at which the iodine is consumed by organic material at the application site.


Q: Does Sindine affect alertness or the ability to drive?

A: Given that Sindine is intended for topical use and minimal systemic absorption is expected, effects on central nervous system function, such as alertness or the ability to drive, are not commonly listed in the regulatory safety information.


Q: Is the research for Sindine still ongoing?

A: Yes, regulatory and public health databases indicate that research related to the active compound, Povidone-Iodine, is ongoing. This includes studies focused on evaluating its influence in new clinical applications and varied patient demographics.


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

A: A common point of clarification derived from the mechanism of action is that its antimicrobial action is a quick, local chemical oxidation process. This process is independent of systemic absorption into the bloodstream for its primary effect.


Q: Does the time of day matter when taking Sindine?

A: The regulatory administration instructions state that the product should be applied one to three times daily, or as necessary. Official documents do not mandate a specific time of day for the application to be effective.


Q: Can Sindine be used by people with a history of heart issues?

A: Official documentation notes that co-administration with other medicines known to prolong the QT interval (affecting the heart’s electrical activity) requires caution. The official product information does not generally address specific restrictions related to other, non-QT-related heart conditions.


Q: What is the average duration a person takes Sindine for?

A: For general first-aid use on minor injuries, the official instructions specify that Sindine should typically not be used for a period longer than 7 consecutive days without professional review.


Q: Is Sindine considered a maintenance medication?

A: No. Official documents specify that the product is intended for short-duration use, typically not exceeding seven days. It is classified as an antiseptic for localized treatment, not a long-term maintenance treatment.


Q: Are there special considerations for people with diabetes using Sindine?

A: While the regulatory label does not include a specific restriction for diabetes, studies have examined the use of the active ingredient in relation to wound-healing outcomes relevant to diabetic patients.


Q: What kind of research has looked at Sindine in different ethnic groups?

A: Clinical trial reporting for the active compound adheres to standard practices for collecting and analyzing participant demographics. This includes reporting data on the race and ethnicity of the individuals enrolled in the studies.

How should Sindine be stored and disposed of?

The official regulatory documents specify strict conditions for the storage and disposal of Sindine (Povidone-Iodine solution) to maintain its chemical integrity.

Storage Requirements

Storage Classification Requirement Prohibited Condition
Temperature Store at controlled room temperature (e.g., 15 C to 30 C) [1]. Do not freeze and avoid excessive heat [1].
Container/Handling Keep in the original container with the cap tightly closed [3, 4]. Protect from light [2].

The medication must always be kept out of the sight and reach of children [1, 4].

Disposal Instructions

Unused or expired Sindine must be discarded according to local, federal, and state regulations [3]. The solution must not be poured down the drain or toilet to prevent environmental release into waterways [6, 8].

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

Available in countries:

Equivalent of Sindine found in:

A-Z Index: