Latrigal

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Latrigal

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 Latrigal

Quick Facts

Property Description
Active Ingredient Lamotrigine (a phenyltriazine derivative)
Form Oral Tablet (single-ingredient product)
Pharmacological Class Anticonvulsant (Antiepileptic Drug) and Mood Stabilizer
Origin Synthetic
Route of Administration Oral

What Type of Medicine is Latrigal?

Latrigal is a prescription-only medicine that contains the active substance Lamotrigine. It is a synthetic compound classified as a second-generation anticonvulsant (Antiepileptic Drug, or AED) and a Mood Stabilizer. The medication is manufactured as a single-ingredient product in an oral tablet form, facilitating systemic delivery through the oral route of administration.

Its pharmacological identity is rooted in the Lamotrigine molecule, which is chemically a phenyltriazine derivative. This classification highlights its difference from older AED classes, as its structure supports a unique mechanism for regulating brain activity. The dual classification confirms its recognized utility for stabilizing both neuronal excitability and affective fluctuations.


Latrigal's Role as a Neurological Stabilizer

The main purpose of Latrigal is to help regulate abnormal electrical activity within the brain. It achieves this by primarily functioning as a voltage-sensitive sodium channel blocker, thereby calming overactive neurological tissue and providing control over erratic brain signals.

Lamotrigine's actions are directed at stabilizing neuronal membranes. It also helps maintain chemical balance by reducing the excessive release of excitatory neurotransmitters such as glutamate and aspartate. This neurological stabilization is its general benefit, making it typically reserved for patients needing long-term management of instability within the central nervous system.

Regulatory References

  1. Lamotrigine Mechanism of Action (NIH)

What side effects are possible with Latrigal?

The safety profile of Latrigal, which contains Lamotrigine, is formally documented by government health authorities and includes a range of classified adverse reactions and specific warnings.

Officially Classified Adverse Reactions

The most frequently reported adverse reactions, classified as having an incidence of 10% or greater in adult clinical trials, primarily affect the nervous system (e.g., dizziness, headache, somnolence, ataxia, and diplopia) and the gastrointestinal system (e.g., nausea). Other common effects include a general rash and rhinitis. Reactions are grouped by System-Organ-Class, spanning dermatological, gastrointestinal, nervous system, and hematological domains.


Serious Safety Warnings and Constraints

Regulatory labels include explicit warnings about rare but potentially life-threatening reactions. These include Serious Skin Rashes such as Stevens-Johnson syndrome (SJS) and Toxic Epidermal Necrolysis (TEN), and Multiorgan Hypersensitivity Reactions (DRESS). The medication is also associated with a risk of Suicidal Behavior and Ideation and Blood Dyscrasias.

Crucially, nearly all severe rashes have been reported within the first 2 to 8 weeks of treatment initiation. The risk of serious rash is documented to increase when the recommended initial dose or the rate of dose escalation is exceeded.

Population-Specific Notes: The label notes a higher incidence of serious rash in pediatric patients compared to adults and requires consideration for dose adjustment in individuals with hepatic or renal impairment.

Overdose and Emergency Response

Overdose and when to seek help

The following information describes the official overdose profile for Latrigal (Lamotrigine), as explicitly documented in governmental regulatory prescribing information.

Domain Official Regulatory Statements
Documented overdose presentations Presentation includes neurological effects like drowsiness, nystagmus, ataxia, and decreased level of consciousness. Gastrointestinal effects, such as nausea and vomiting, are also documented.
Physiological systems affected The primary systems affected are the Central Nervous System (CNS) and the cardiovascular system, with documented risks ranging from seizures to severe cardiac conduction abnormalities.
Population-specific overdose notes Pediatric patients (children le 3.5 years) have shown increased susceptibility to CNS toxicity and the development of seizures compared to adults.
Emergency-response statements Management requires symptomatic and supportive treatment. Procedures such as gastrointestinal decontamination and intensive monitoring are described. No specific antidote is known to exist.
When immediate medical help is required Immediate medical attention must be sought for any suspected overdose event. Emergency medical care is required when severe manifestations such as seizures, cardiac symptoms, or decreased level of consciousness are present.

Official Overdose Statements

  • Overdose may present with a decreased level of consciousness, progressing to coma, and the development of seizures, including status epilepticus.
  • Severe overdose is associated with documented cardiovascular effects, including QRS prolongation, ventricular dysrhythmias, and the potential for cardiac arrest.
  • Hospital monitoring, including continuous Electrocardiogram (ECG) monitoring, is a required procedural step for assessing and managing cardiotoxicity.

The official regulatory documents define the overdose profile of Latrigal through a focus on severe neurological and cardiovascular manifestations that necessitate immediate emergency care. The documented risk of status epilepticus and severe cardiac conduction disturbances mandates urgent hospital admission and the deployment of supportive treatment measures.

Therapeutic Uses of Latrigal

This medication is generally considered relevant for long-term support in situations involving chronic neurological and affective instability. It may assist with maintaining functional stability across its primary indications, which include epilepsy (seizure disorders) and the maintenance treatment of Bipolar I disorder in adults.

Long-Term Support for Instability

Latrigal is commonly used to help manage symptoms related to epilepsy—conditions involving episodic or fluctuating manifestations of abnormal electrical activity. It is commonly used to help with managing the frequency of various seizure types, including partial-onset and specific generalized seizures. The medication is also applied across domains where additional symptomatic support is needed for Bipolar I disorder in adults. It plays a role in managing conditions characterized by periods of heightened symptoms by contributing to support against the recurrence of depressive episodes and other severe mood swings.

“The benefit of this medication may include supporting stabilization, which assists patients in coping more steadily with symptom fluctuations over the long term.”

This provides supportive relief when symptoms interfere with routine activities and supports general well-being during symptomatic phases.

Quick Fact Relief for Symptom
Epilepsy Context Helps manage the frequency of recurrent seizures
Bipolar Context May assist in managing recurrent depressive episodes

Regulatory References

  1. NIH MedlinePlus overview of Lamotrigine

Eligibility and Restrictions for Use

Eligibility to Use Latrigal: Official Regulatory Profile

Official regulatory documentation defines eligibility for Latrigal (lamotrigine) based on age, hypersensitivity, and underlying health conditions.

Classification Category Official Regulatory Statement
Populations Contraindicated Contraindicated in individuals with known hypersensitivity to lamotrigine or any of its ingredients. Restarting after discontinuation due to a serious rash (e.g., Stevens-Johnson syndrome) is strongly restricted.
Age-Related Eligibility Adults (18+): Eligible for all approved uses. Pediatric Patients: Approved for specific epilepsy adjunctive therapy starting at 2 years of age. Safety and effectiveness are not established for epilepsy in children under 2 or for Bipolar I maintenance in patients under 18.
Condition-Specific Restrictions Moderate/Severe Hepatic Impairment: Requires dosage adjustments. Significant Renal Impairment: Reduced maintenance doses may be effective, and caution is advised. Cardiac Disorders: Use must carefully weigh the benefit against the risk in patients with clinically important structural or functional heart disease.
Reproductive Status Pregnancy: Use should only occur if the potential benefit outweighs the potential risk. A pregnancy registry is available. Breastfeeding: Lamotrigine is present in breast milk; use is advised with caution and consideration for monitoring the infant.

Regulatory agencies define the eligibility profile through an absolute exclusion (hypersensitivity) and specific conditional use rules based on age, organ function, and cardiovascular status. All use is subject to these officially documented population limitations.

What should I know about interactions with other medicines?

Latrigal Interactions with other medicines and products

The official interaction profile of Latrigal (Lamotrigine) is primarily defined by documented changes in its apparent clearance when co-administered with specific medicinal products. These clinically significant pharmacokinetic interactions stem from the inhibition or induction of the medicine's primary metabolic clearance pathway, which is glucuronidation.

Interaction Type Interacting Substances Official Outcome
Increased Exposure (Inhibition) Valproate (Valproic acid/Divalproex sodium) Increases Latrigal concentrations more than 2-fold due to decreased apparent clearance. Co-administration with Valproate is also associated with a documented pharmacodynamic risk of a severe, potentially life-threatening rash.
Decreased Exposure (Induction) Oral Estrogen Contraceptives, Rifampin, Carbamazepine, Phenytoin, Phenobarbital, Primidone Decreases Latrigal concentrations by approximately 40% to 50% due to increased apparent clearance.

Additional substances documented to reduce Latrigal exposure include certain Antiretroviral Agents, such as Lopinavir/ritonavir and Atazanavir/ritonavir. Furthermore, the regulatory label advises that the co-ingestion of alcohol may increase the risk of certain central nervous system effects. The official documents do not list any mandatory timing rules for separating doses. Caution regarding use is advised for patients with renal or liver disease, as slower systemic clearance can impact interaction severity.

Mechanism of Action

Latrigal (Lamotrigine) operates by a dual-action pharmacodynamic mechanism focused entirely on attenuating high-frequency electrical conductance within the central nervous system. Its function is best understood by tracing the sequence from its molecular targets to the resulting modification of neuronal electrical characteristics.

Selective Modulation of Neuronal Excitability

This mechanism involves the primary interaction with Voltage-Gated Sodium Channels ( Na^+ channels). The drug utilizes a use- and voltage-dependent blockade by binding to and stabilizing the inactivated state of the channel pore. This attenuates the capacity for sustained, high-frequency electrical discharge and exhibits minimal interference with low-frequency electrical signaling.

Downstream Inhibition of Excitatory Signaling

Subsequent to the electrical blockade, a mechanistic cascade affects chemical communication. The Na^+ channel modulation reduces the necessary Ca^2+ influx at the nerve terminal, leading to the inhibition of the release of Excitatory Amino Acids (EAAs), specifically Glutamate and Aspartate. By limiting the outflow of these excitatory messengers, the drug modulates excitability across neural pathways and reduces the overall excitatory input, influencing sustained modulation of CNS activity.

Dosage and Administration Information

How to Use Latrigal

Latrigal (Lamotrigine) is administered exclusively via the oral route for all approved forms, which include immediate-release, chewable/dispersible, orally disintegrating, and extended-release tablets. The medicine may be taken with or without food.

The fundamental principle governing its use is the slow dose titration. Treatment must begin with a low starting dose (e.g., 25 mg daily or every other day) that is gradually escalated over a structured period of four to seven weeks until a maintenance dose is reached. The precise initial dose, the titration rate, and the final maintenance dose range (which may be between 100 mg/day and 500 mg/day) are strictly determined by the patient's concurrent medication regimen.

Administration Rules and Procedural Constraints

Feature Official Instruction / Rule
Dosing Frequency Immediate-release forms are typically taken once daily or in two divided doses (BID) for maintenance, while the extended-release form is taken once daily (QD).
Special Handling Extended-Release (XR) Tablets must be swallowed whole and must not be crushed, chewed, or divided. Chewable tablets may be dispersed in approximately 5 mL of liquid.
Dose Escalation The recommended initial dose and subsequent escalation rates must not be exceeded.
Discontinuation Stopping the medication requires a gradual step-wise reduction/taper over at least two weeks to prevent complications. If treatment is interrupted for more than five half-lives, re-initiation must follow the initial slow titration schedule.

The protocol is highly dependent on achieving and maintaining stability through a careful, predefined initial dosing period.

Recent Clinical Evidence

Evidence for Use in Managing Seizure Disorders

Research has primarily studied Latrigal for conditions characterized by fluctuating or episodic manifestations of abnormal electrical activity, including partial-onset and generalized tonic-clonic seizures. The evidence for this use primarily consists of Randomized Controlled Trials (RCTs) and studies examining the process of switching patients to single-agent therapy. Trials monitored outcomes related to seizure frequency and explored the proportion of patients who achieved seizure control. Studies have also observed its use in pediatric populations (children and adolescents) for specific seizure types. However, research has not established support for Latrigal's use as a starting single treatment (initial monotherapy) for newly diagnosed epilepsy.


Evidence for Use in Maintenance Treatment of Bipolar I Disorder

Latrigal was evaluated in individuals with Bipolar I Disorder, a condition characterized by cycles of stability and flare-ups of mood symptoms. The primary evidence consists of long-term, placebo-controlled RCTs applied in studies exploring symptom changes related to the return of mood episodes. Findings indicate patterns where the time to recurrence of depressive episodes was extended in the observed populations. Conversely, research has not established support for treating an existing (acute) manic or mixed mood episode, and the evidence base for this maintenance use contains studies where sample sizes were modest.


Long-Term Research and Study Limitations

Research included intermediate- to long-term follow-up durations through open-label extension phases and pivotal maintenance studies lasting up to 18 months or longer. These defined observation intervals help contextualize the patterns measured. There is limited information for long-term outcomes beyond the duration of these specific study protocols. The data for certain groups remain insufficient when considering very long-term outcomes. Overall, the evidence highlights what is known — and what is still uncertain — as research does not provide a basis to predict whether an individual will respond similarly to group patterns.

Frequently Asked Questions (FAQ)

Common questions about Latrigal (FAQ)

Q: Can I take Latrigal if I'm taking vitamins or herbal supplements?

Official documents list known interactions with specific prescription medicines and alcohol. Because certain substances can affect how Latrigal is processed by the body (its metabolism), it is important to inform a healthcare professional about all vitamins, herbal products, and supplements that are being used.

Q: How quickly does Latrigal usually start to work?

Latrigal must be started at a low dose and slowly increased over a structured period, typically lasting four to seven weeks, to minimize safety risks. For this reason, a complete therapeutic effect is usually associated with reaching the stable maintenance dose after the initial slow dosing schedule (titration) is complete.

Q: Is Latrigal considered a long-term medication?

Yes, Latrigal is approved for the long-term management of chronic conditions. It is indicated for the maintenance treatment of Bipolar I Disorder and for extended use in controlling certain seizure disorders.

Q: Are there any foods or drinks I should avoid while using Latrigal?

Official information states that Latrigal can be taken with or without food. However, official documentation notes that the co-ingestion of alcohol may increase the risk of certain central nervous system (CNS) effects, such as drowsiness or dizziness.

Q: What does 'contraindication' mean in relation to Latrigal?

A contraindication is a regulatory restriction meaning the medicine should not be used in specific situations due to a significant health risk. Latrigal is officially contraindicated in individuals with a known hypersensitivity, or allergic reaction, to the medicine's active substance, Lamotrigine.

Q: How long does Latrigal stay in the system after the last use?

The time required for Latrigal to be fully cleared from the body varies widely depending on an individual's metabolism and other medicines they may be taking. Regulatory documents reference the medicine’s half-life, noting that if treatment is interrupted for more than five half-lives, the medicine must be restarted using the initial slow dosing schedule.

Q: Is there a maximum recommended duration for Latrigal use?

Official studies have evaluated the use of Latrigal for follow-up periods of 18 months or longer, and the medicine is approved for long-term management. However, regulatory documents do not define a formal maximum recommended duration for continuous therapy.

Q: What evidence is there that Latrigal is effective for its approved uses?

Evidence for approved uses is based on controlled clinical trials. For Bipolar I Disorder, studies indicated that Latrigal extended the time until the recurrence of depressive mood episodes. For seizure disorders, trials monitored the medicine’s ability to reduce seizure frequency and achieve control.

Q: Does Latrigal affect hormone levels?

Official documents describe a known drug interaction where the use of oral contraceptives containing estrogen can significantly decrease the level of Latrigal in the bloodstream. This pharmacokinetic interaction necessitates dose adjustments for Latrigal.

Q: Are there any drug classes that should always be avoided with Latrigal?

Latrigal must not be taken if there is a known hypersensitivity to any of its components. Furthermore, caution and dose adjustments are required for many interacting substances, most notably Valproate and medicines that induce the medicine’s metabolic clearance.

Q: Does Latrigal require any special monitoring by a healthcare professional?

Yes, official documentation advises monitoring for rare but serious adverse reactions, which include Suicidal Behavior and Ideation, Serious Skin Rashes, and Blood Dyscrasias (disorders affecting blood cell components).

Q: What is the difference between 'on-label' and 'off-label' use of Latrigal?

'On-label' use refers to the specific medical conditions for which Latrigal has been formally tested and approved by regulatory authorities, such as Bipolar I maintenance and specific seizure disorders. Information on 'off-label' use (unapproved uses) is not provided in official regulatory documents.

Q: Is Latrigal used to treat the underlying condition or just the symptoms?

Latrigal functions by stabilizing neuronal membranes and reducing the release of excitatory neurotransmitters. This mechanism is directed at helping to regulate abnormal electrical activity in the brain and provide control over erratic signals, thereby stabilizing the neurological system.

Q: Does Latrigal have any warnings about use in older adults?

Official regulatory documents indicate that in people over the age of 60 years, an electrocardiogram (EKG) may be considered prior to starting treatment. This is due to the increasing likelihood of underlying heart rhythm issues in this age group.

Q: Is it safe to drive or operate machinery while using Latrigal?

Official regulatory information suggests that activities requiring mental alertness, such as driving or operating machinery, should be avoided until the patient knows how the medicine affects them, as side effects can include dizziness, drowsiness, and coordination trouble.

Q: What should I do if a side effect of Latrigal seems serious?

Official regulatory documents indicate that if a severe reaction occurs, such as a serious skin rash or fever, immediate medical attention is generally advised, and discontinuation of the medicine may be necessary.

Q: Does Latrigal interact with pain relievers like ibuprofen?

Official product labeling does not typically list specific interactions with common non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen. However, all over-the-counter pain relievers are generally advised to be discussed with a healthcare professional, as all medications may have potential effects on organ functions.

Q: Will taking Latrigal affect the results of any lab tests?

Latrigal is a medicine for which drug concentration levels are frequently measured in serum or plasma to guide treatment. Furthermore, official warnings include the risk of rare but serious side effects known as Blood Dyscrasias, which can impact routine lab test results.

Q: What is the purpose of the 'Black Box Warning' sometimes mentioned with Latrigal?

The Boxed Warning (often referred to as the Black Box Warning) is a measure used by the FDA to highlight serious or life-threatening risks. For Latrigal, this warning relates to the risk of Severe Skin Rashes (including Stevens-Johnson syndrome) and, more recently, Hemophagocytic Lymphohistiocytosis (HLH).

Q: Are there any known interactions between Latrigal and common cold medicines?

Some common cold medicines contain ingredients like antihistamines or dextromethorphan that can increase central nervous system (CNS) side effects such as drowsiness and confusion when combined with Latrigal. Caution is also advised regarding cold medicines containing sympathomimetic agents, particularly for those with underlying heart conditions.

How should Latrigal be stored and disposed of?

Latrigal (lamotrigine tablets) must be stored under specific environmental conditions to maintain stability.

Storage Requirements

Condition Regulatory Specification
Temperature Store at controlled room temperature, 25 C (77 F), with excursions permitted between 15 C and 30 C (59 F and 86 F).
Protection Protect from light and moisture; keep the product in its original container or packaging.
Safety The medication must be kept out of the sight and reach of children.

Disposal Instructions

Unused or expired Latrigal should not be disposed of in household trash or poured down a sink or toilet (wastewater). Disposal must follow established pharmaceutical waste regulations. Unwanted medicine should be returned to a pharmacist or collected through a designated local take-back program to ensure environmentally safe disposal.

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

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