Gab

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Gab

Treatment option:

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 Gab

What is Gab: Identity and Classification

Property Description
Active Ingredient Gamma Benzene Hexachloride (Lindane)
Form Topical lotion, cream, or shampoo
Pharmacological Class Ectoparasiticide (Antiscabies/Antipediculosis agent)
Common Use Targeting external parasitic infestations
Origin Synthetic (Organochlorine compound)

Definition and Active Composition

Gab is a potent, synthetic single-ingredient topical medication used specifically to combat parasitic infestations of the skin. Its therapeutic efficacy is derived from the core active ingredient, Gamma Benzene Hexachloride, which is more commonly known by its generic name, Lindane. The chemical structure of Lindane classifies it as an organochlorine compound and a chlorinated hydrocarbon.

This substance is the sole active component, meaning the drug is formulated as a single-ingredient product within various topical bases, such as a lotion, cream, or shampoo vehicle, designed for topical (dermal) application. The formulation into these easily applied forms distinguishes the treatment approach by ensuring high-contact delivery of the chemical agent to the affected area.

Classification and General Purpose of Gab

Gab is classified within the pharmaceutical domain as an ectoparasiticide, meaning its dedicated function is the chemical destruction of parasites that infest the external surfaces of the human body. As an ectoparasiticide, it serves the specific roles of an antiscabies agent and an antipediculosis agent, targeting the responsible mites and lice.

Lindane has a history of use in managing these conditions. This established role confirms that the drug’s general therapeutic purpose is the prompt elimination of parasitic organisms to resolve the underlying skin condition, an approach used for its effectiveness against these arthropods.

What side effects are possible with Gab?

Possible side effects and safety information

The official regulatory safety profile for Gab (Lindane) is characterized by a potential for serious central nervous system (CNS) toxicity, leading to its status as a second-line therapy. The most serious risk is documented in a Boxed Warning issued by the FDA, highlighting the reported incidence of systemic neurotoxicity, including seizures and death, which have occurred with repeat or prolonged application and, rarely, following a single, directed application. CNS effects have been reported more frequently with the lotion formulation than with the shampoo.


Adverse Reactions and Systemic Effects

The most common adverse reactions listed in regulatory documents include local effects such as itching skin (pruritus), burning skin, dry skin, and skin rash. Pruritus may persist for one to several weeks after successful treatment and is not considered an indication for retreatment. Systemic effects, although less common, have been reported across several system-organ classes, including Nervous System Disorders (e.g., headache, dizziness), Blood and Lymphatic System Disorders (aplastic anemia), and Cardiac Disorders (cardiac arrhythmia).


Regulatory Restrictions and High-Risk Populations

Official labeling mandates several contraindications where use is strictly prohibited. These include premature neonates, individuals with an uncontrolled seizure disorder, or patients with crusted (Norwegian) scabies or skin conditions (such as eczema) that increase systemic absorption. Populations at explicitly increased risk of neurotoxicity include infants, children, elderly persons, and individuals weighing less than 110 lbs (50 kg). The use of oils or oil-based products may enhance absorption and increase the risk of serious CNS events.

Overdose and Emergency Response

Overdose and When to Seek Help

The overdose profile for Gab (Lindane) is defined by its potential for systemic toxicity, primarily affecting the central nervous system (CNS). This information is derived from official government regulatory sources, which outline the documented manifestations and mandatory emergency response actions.


Documented Manifestations and Severe Outcomes

Classification Official Regulatory Wording
Documented CNS Effects Seizures (convulsions, fits), coma, tremor, dizziness, confusion, and restlessness.
Systemic Effects Nausea, vomiting, abdominal pain, cardiovascular collapse, pulmonary edema, and metabolic acidosis.
Severity Overdose may result in severe or life-threatening outcomes, including death, particularly following misuse or accidental ingestion.

Regulator-Mandated Emergency Actions

The regulatory guidance emphasizes that no specific antidote is known for Lindane overdose; therefore, management is strictly symptomatic and supportive.

  • Seek immediate medical attention/emergency help right away if a seizure or any signs of collapse occur.
  • Call emergency services immediately if the person is unconscious, having trouble breathing, or cannot be awakened, or in the event of accidental ingestion.
  • Supportive measures include the control of convulsions using an appropriate drug regimen, and hospital monitoring for electrolyte and acid-base balance.

Population-Specific Overdose Considerations

Official labeling notes an increased risk of serious neurotoxicity in specific populations, including infants, children, the elderly, individuals weighing less than 110 lbs (50 kg), and those with certain pre-existing skin conditions (e.g., broken skin) or uncontrolled seizure disorders.

Therapeutic Uses of Gab

What Gab Treats: Main Uses and Benefits

This medication is generally considered relevant in clinical settings for conditions involving ectoparasitic infestations, specifically scabies (mite infestation) and lice (Pediculosis capitis, corporis, and pubis). It is commonly used in scenarios where alternative symptomatic support has been insufficient or is not appropriate for the patient.

This therapy is applied across domains where additional symptomatic support is needed and is relevant for easing this aspect of the condition. It is used to help manage the pronounced discomfort associated with these infestations, particularly intense pruritus (itching) and skin irritation.

“The treatment provides support that helps ease the overall symptom burden and assists with maintaining functional stability.”

The treatment is applied in the context of the active infestation and contributes to improved day-to-day comfort during symptomatic periods. This helps maintain a sense of stability when symptoms are more noticeable, supporting the patient during these difficult episodes.

Quick Fact: Relief for Intense Pruritus

The primary therapeutic purpose is the management of symptomatic relief for the severe, persistent itching and skin irritation that are primary features of parasitic skin infestations.

Eligibility and Restrictions for Use

The regulatory eligibility for Gab (Lindane) is defined by strict restrictions, classifying it as a second-line therapy only. It is exclusively intended for patients who have failed or cannot tolerate safer, alternative first-line treatments.

Population Status Eligibility Rule
Contraindicated Populations Must Not Use. This includes premature infants and individuals with known uncontrolled seizure disorders. The drug is also prohibited for patients with crusted (Norwegian) scabies or extensive skin disorders (such as severe atopic dermatitis or psoriasis) that increase systemic absorption. Use is also contraindicated due to known hypersensitivity.
Populations Not Recommended Use is Restricted. The drug is generally not recommended for infants and children, particularly those under 10 years old or who weigh less than 110 pounds (50 kg). Caution is also required for use in the elderly.

Use is strictly limited to a single application and must not be applied to broken skin or open wounds. Caution is required in patients with conditions that may increase seizure risk, such as severe hepatic impairment. During pregnancy, use is not generally recommended. Breastfeeding mothers must interrupt nursing and discard milk for at least 24 hours following application.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Gab (Lindane topical) has an officially documented interaction profile centered on the risk of neurotoxicity, which may manifest as seizures. This risk is managed through two primary interaction classifications detailed in regulatory documents: exposure modification and pharmacodynamic reinforcement.

Interaction Classification Relevant Substances or Conditions
Exposure-Altering Interaction Topical oils, oil-based hair dressings, creams, or conditioners.
Pharmacodynamic Interaction Agents that lower the seizure threshold.

The official profile specifies that the co-administration or prior use of topical oils and oil-based products must be avoided because they enhance the systemic absorption of Lindane through the skin, leading to increased drug exposure. This exposure-modifying interaction is a key constraint on use.

Furthermore, a pharmacodynamic interaction exists with agents that lower the seizure threshold, leading to an additive effect that increases the overall potential for seizures. While no specific oral products are universally prohibited, co-administration with this class of medicines requires careful consideration according to regulatory warnings.

Population-specific interaction notes specify that the risk is higher in patients with pre-existing conditions such as severe hepatic cirrhosis or HIV infection, as well as in those with excessive alcohol consumption or experiencing abrupt alcohol withdrawal.

Mechanism of Action

Modulation of Presynaptic Calcium Channels

Gab targets and modulates the alpha-2-delta (alpha 2 delta) subunit of voltage-gated calcium channels (VGCCs) located on the surfaces of presynaptic nerve cells. By altering the function and reducing the availability of these channels, the mechanism restricts the influx of calcium ions ( Ca^2+), which is the necessary trigger for releasing excitatory chemical messengers.

Enhancing the Central Inhibitory System

A complementary mechanistic domain involves the GABAergic system, the central nervous system's principal inhibitory pathway. Gab's action here is to positively modulate GABA A receptors, increasing the inhibitory signals that reduce the rate of nerve cell activity and electrical firing.

Cascades and Neuronal Stabilization

The combination of reducing excitatory release and enhancing inhibitory signals creates a mechanistic cascade that leads to system-wide physiological consequences. These actions reduce abnormal, high-frequency signaling patterns, which results in a change in the electrical properties of the neurons, limiting sustained high-frequency firing. The cumulative effect results in broad physiological modulation of central nervous system communication.

Dosage and Administration Information

Gab (Gamma Benzene Hexachloride/Lindane) is used exclusively via the topical (dermal) route of administration as a highly restricted, single-course treatment. Its use is defined by a strict protocol that specifies the concentration, contact time, and frequency.

The medication is available only in the 1% strength, offered as a lotion or a shampoo. The fundamental instruction for both forms is a single application only; re-treatment is strictly prohibited. The total amount prescribed and dispensed must be limited to the exact volume required for that single course, such as the 1-to-2-ounce (30–60 mL) maximum adult dose.

Administration Scope and Timing

Form Application Method Contact Duration
1% Lotion (Scabies) Applied to the skin below the neck. Left on for 8 to 12 hours.
1% Shampoo (Lice) Applied to dry hair or affected area. Left on for 4 minutes only.

The labeled instructions specify that the 1% Shampoo must be applied directly to dry hair before immediate rinsing. Following the rinse, a fine-tooth comb is procedurally used to remove nits. The use of this drug is generally constrained by patient weight, as it is indicated for individuals weighing at least 110 pounds (50 kg).

Recent Clinical Evidence

Research Evidence / Overview of Studies for Gab (Lindane)

Evidence for use in Scabies Infestation

Research explored Gab in the context of scabies, a condition characterized by fluctuating or episodic manifestations involving mite infestation. The research base includes some Randomized Controlled Trials (RCTs) and various Systematic Reviews where Gab was studied for adult and older child populations. These studies examined outcomes related to physical discomfort, including measured clearance rates of mites and skin lesions, and monitoring how patient-reported outcomes describing perceived discomfort, such as itching, evolved in the observed populations.

The findings describe patterns observed in the studies where trials reported measurements of clinical outcomes at short-term check-up intervals. However, the reported outcomes, including measured clearance rates, may demonstrate variability across different study settings and geographic locations. This suggests that the evidence contributes to understanding symptom patterns, but the results do not determine whether an individual will respond similarly across all situations.

Evidence for use in Lice Infestation (Pediculosis)

Research explored the topical use of Gab for lice, specifically in trials assessing short-term or episodic symptom patterns associated with head lice. These studies involved school-aged children and adults and monitored outcomes describing episodic or acute changes, such as the measurement of lice and viable eggs following treatment.

Studies reported measurements related to the proportion of people where lice was absent following treatment. However, findings were mixed, with scientific reviews often noting that reported outcomes can be inconsistent across different areas. This inconsistency, combined with reports of parasite susceptibility variability, means that the research provides insight into short-term changes but highlights where certainty remains low for current, universal outcomes.

Long-Term Follow-up and Durability of Effect

Research examined responses over defined time intervals, but follow-up durations were limited in many of the core clinical trials for Gab. This means that data concerning the maintenance of initial measured outcomes or the durability of the response is still emerging, and long-term effects are not fully established. Because the primary research explored short-term symptom changes, there is limited information for long-term outcomes that reflect sustained health over many months.

Research Gaps and Uncertainty in the Evidence

The evidence landscape for Gab highlights specific areas where more research is needed or where existing findings are limited. Evidence quality varies across studies, and comparative evidence is lacking for some of the newer treatment options. The potential for the parasite to develop resistance was observed in some studies, which highlights that certainty remains low for predicting consistent outcomes across all geographical regions today. Furthermore, comparative evidence is lacking for certain study designs.

[Study results reflect the specific conditions under which they were conducted, and research does not determine whether an individual will respond similarly.]

Frequently Asked Questions (FAQ)

Common questions about Gab (FAQ)


Q: Does Gab have a history of being recalled or having major safety alerts?

Yes, regulatory agencies have issued a Boxed Warning for Gab. The Boxed Warning is the highest-level safety alert and highlights the potential for serious systemic neurotoxicity, including reported cases of seizures and death, associated with its use.


Q: What are the requirements for getting a prescription for Gab?

Regulatory guidance explicitly mandates that Gab is a second-line treatment. This means prescription is restricted only to patients who have formally failed or cannot tolerate safer, alternative first-line treatments for lice or scabies. This strict classification reflects the drug’s potential for serious side effects, as highlighted in its official warnings.


Q: What common symptoms might be mistaken for a Gab side effect?

Official safety information notes that local effects such as itching (pruritus) are common following treatment. Regulatory documentation specifically states that this itching may continue for one to several weeks after successful parasite clearance. Regulatory labeling states that this persistent itching is not typically considered a reason for repeating the treatment.


Q: Is Gab the same type of medicine as [similar sounding drug name]?

Official documentation classifies Gab (Lindane) in the pharmacological class of ectoparasiticides. This means the drug is specifically used to target and eliminate external parasites, such as mites and lice, that infest the skin and hair. This classification defines its specific chemical structure and function within the medicinal landscape.


Q: How quickly does Gab usually start to work after the first dose?

Gab is a highly restricted, single-application treatment. The official instructions for use mandate that the medication remains in contact with the affected area for a specific, defined duration to be effective. This contact time is typically 4 minutes for the shampoo formulation or 8 to 12 hours for the lotion formulation before it is rinsed off.


Q: What is the general expected time frame to notice an effect from Gab?

Clinical studies described in regulatory documents primarily examined the outcomes in the short-term following the single application. Official information notes that even after successful parasite elimination, symptoms like itching (pruritus) may persist for one to several weeks. Regulatory labeling indicates this persistence of itching is not considered an indication for retreatment.


Q: Are there any common over-the-counter medicines that interact with Gab?

Official interaction warnings focus on two main classes of products. The first class is topical oils or oil-based products, which are prohibited because they can increase the drug's absorption through the skin. The second class is any medication or substance that is known to lower the seizure threshold. Co-administration with these types of agents is a known risk discussed in the regulatory documentation.


Q: Can Gab affect my ability to drive or operate machinery?

Regulatory documents note the potential for systemic effects on the nervous system. Adverse reaction reports list effects such as dizziness and headache. The presence of these documented nervous system effects indicates a potential impact on mental alertness and the ability to safely perform complex tasks like driving or operating machinery.


Q: Is Gab known to be harder on the liver or kidneys than other drugs?

Regulatory documentation identifies patients with pre-existing conditions like severe hepatic cirrhosis or severe hepatic impairment (liver damage) as having an increased risk of serious neurotoxicity. Due to this increased risk, careful consideration is advised when the drug is used in these populations. There is no comparable statement in the official guidance regarding kidney function.


Q: Are there specific food or drink restrictions while taking Gab?

Official regulatory warnings focus on the consumption of alcohol. Documentation notes that the risk of neurotoxicity is increased in populations with a history of excessive alcohol consumption or those currently experiencing abrupt alcohol withdrawal. Since the medication is applied topically, specific restrictions regarding food or meals are not generally addressed.


Q: Is it normal to feel a change in mood or energy after starting Gab?

Adverse reaction reports in regulatory documents list effects on the nervous system, including headache and dizziness. Official warnings also highlight the potential for serious neurotoxicity (a toxic effect on the central nervous system). Any unusual or persistent effects on the nervous system are typically reported to a healthcare provider.


Q: Can Gab be taken with common pain relievers like ibuprofen or acetaminophen?

Regulatory safety information warns of potential interaction with any medication classified as an agent that lowers the seizure threshold. This means that co-administration with any medicine in this class may increase the overall potential for seizures. Official guidance recommends that all current prescription and non-prescription products are reviewed with a healthcare provider.


Q: What has recent research on Gab focused on?

Research reviews described in regulatory documents reflect the challenges in achieving consistent outcomes. The evidence base often notes that results may vary due to factors like parasite resistance variability and the limited follow-up duration of core clinical trials. These topics represent ongoing areas of regulatory discussion and focus.


Q: Is Gab a non-sedating medication?

Official adverse reaction reports list dizziness and other Nervous System Disorders as potential systemic effects following the topical application. These documented effects suggest the medication may impact mental alertness and should be carefully considered.

How should Gab be stored and disposed of?

How to Store and Dispose of Lindane (Gab) Topical Formulations

Lindane topical products must be stored at Controlled Room Temperature, which is officially defined as 20 C to 25 C (68 F to 77 F), with permitted excursions up to 30 C (86 F). The product must be protected from excessive heat and must not be frozen to maintain its stability.

Container and Safety Requirements

To ensure product integrity, the medicine must be stored in the original container and kept tightly closed. As a mandatory safety instruction, Lindane must be stored out of the sight and reach of children.

Official Disposal Rules

Disposal must not occur via wastewater or household waste. Unused or expired Lindane must be disposed of in accordance with local environmental protection requirements and state laws, often requiring the medicine to be returned to a pharmacy or authorized collection point.

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

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