Trawell

Quick links to important sections

Trawell

Method of action: Antiemetic

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 Trawell

Understanding Trawell

Trawell is a medication primarily utilized to manage and prevent symptoms associated with motion sickness. It belongs to a class of drugs known as antihistamines, specifically those with antiemetic properties that help stabilize the vestibular system during movement.

Composition and Mechanism

The active ingredient in Trawell works by blocking certain receptors in the brain and inner ear. By reducing the sensitivity of the balance centers, the medication helps to mitigate the signals that lead to physical discomfort during travel. This mechanism is intended to address the sensory conflict that occurs when the movement perceived by the eyes differs from the movement sensed by the inner ear.

Primary Uses

Trawell is commonly used for individuals experiencing various forms of motion-induced distress, including:

  • Sea sickness: Discomfort caused by the motion of watercraft.
  • Air sickness: Sensitivity to the movement and pressure changes in aircraft.
  • Car sickness: Nausea or dizziness resulting from travel in automobiles or buses.

Beyond travel-related symptoms, the medication may also be used to manage vertigo or nausea associated with other conditions affecting the equilibrium. It is designed to provide relief from the dizziness, nausea, and vomiting that often accompany these disturbances.

What side effects are possible with Trawell?

Possible Side Effects and Safety Information

The safety profile of Trawell (Dimenhydrinate) is based on official government regulatory documents, which categorize adverse reactions by frequency and affected body system. This section details officially documented side effects and mandatory usage restrictions.

Officially Documented Adverse Reactions

The most frequently reported effects are related to the central nervous system depression characteristic of this class of medication.

Classification Example Adverse Reaction
Very Common Drowsiness (Somnolence)
Common Sedation, Dizziness, Dry mouth, Asthenia (Weakness)
Uncommon Headache, Vision blurred, Tinnitus, Palpitations, Urinary retention

Adverse reactions are also classified by System-Organ Class (SOC) and include effects on the Nervous System (e.g., disturbed coordination, tremor), Gastrointestinal system (e.g., constipation, nausea, vomiting), Cardiac system (e.g., tachycardia), and Renal/Urinary system (e.g., urinary retention).

Serious Safety Concerns

Regulatory documents list certain reactions that may require immediate attention or limit use:

  • Paradoxical CNS Stimulation: In young children, or occasionally adults, the drug may cause excitation, agitation, or restlessness instead of sedation.
  • Acute Angle-Closure Glaucoma: The drug's properties present a risk of increasing intraocular pressure.
  • Convulsion and Tachycardia are documented as serious, less common reactions.
  • Dimenhydrinate may potentially mask symptoms of ototoxicity (ear damage) when taken with other medications known to cause this condition.

Population-Specific Statements and Restrictions

Official labeling defines specific safety considerations for patient groups and conditions:

  • Older Adults (65+): They may be more sensitive to adverse effects like dizziness, sedation, and hypotension.
  • Pediatrics: Higher risk of paradoxical CNS stimulation; not for over-the-counter use in children under two years of age.
  • Pregnancy/Lactation: Use is not recommended during the third trimester of pregnancy or while breastfeeding.
  • Contraindications: Use is restricted for individuals with conditions such as narrow-angle glaucoma, symptomatic prostatic hypertrophy leading to urinary retention, or hypersensitivity to the components.

Overdose and Emergency Response

Overdose and When to Seek Help

Overdose of Trawell (Dimenhydrinate) is officially documented by regulatory authorities as a profile combining Central Nervous System (CNS) effects and a systemic Anticholinergic Toxicity Syndrome. Manifestations range from CNS excitation—including agitation, delirium, and hallucinations—to severe CNS depression, somnolence, and coma. Anticholinergic signs, such as Tachycardia (rapid heartbeat), Mydriasis (enlarged pupils), and Pyrexia (fever), are also documented in the official labeling.

The official documents identify several potentially life-threatening outcomes, including convulsions, respiratory depression, and cardiovascular collapse. Severe consequences, such as death, are noted in the overdose profile. Specific population risks are highlighted, as pediatric patients are particularly likely to display stimulation, and overdose may cause hallucinations, convulsions, or death in this group.

Immediate emergency medical attention must be sought upon the observation of specific severe triggers. Regulators mandate contacting the Poison Help line and seeking immediate help if the patient is hallucinating, cannot be awakened, experiences a seizure, has trouble breathing, or has collapsed.

Management described in official prescribing information is supportive and symptomatic, as no specific antidote is known. Procedures like activated charcoal or gastric lavage are documented interventions for decontamination, and parenteral diazepam may be used for convulsions.

Therapeutic Uses of Trawell

What Trawell Treats: Main Uses and Benefits

Trawell (Dimenhydrinate) is commonly used to help with symptoms related to systemic imbalance and motion-induced distress. Its primary application is used for managing Motion Sickness (Kinetosis). It may be part of symptomatic management in conditions presenting with systemic or localized discomfort, such as Labyrinthitis and symptomatic episodes of Ménière's disease. The medication is applied in addressing symptom clusters that may become intense or disruptive, such as nausea, vomiting, and dizziness.

This medicine is commonly used when short-term symptomatic assistance is needed, often applied during travel by air, sea, or land, and in repetitive movement scenarios. It is used for managing symptoms that interfere with daily comfort. This provides support that helps ease the overall symptom burden and supports patients during difficult episodes by easing distress.


Quick Fact: Support for Motion-Induced Symptoms
Symptom Focus Nausea, Vomiting, Vertigo, Dizziness
Primary Use Context Prophylaxis and symptomatic control during travel
Therapeutic Benefit Supports patients by easing the overall symptom load

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

Eligibility Map: Official Regulatory Information

The eligibility for Trawell (Dimenhydrinate) is strictly defined by regulatory documents based on age, patient history, and certain pre-existing medical conditions.

Eligibility Scope Status Defined by Label
Populations for Use Approved for Adults and Children starting at 2 years of age (oral form).
Populations Contraindicated Strictly prohibited for patients with known hypersensitivity to dimenhydrinate or its components, narrow-angle glaucoma, or those concurrently using a Monoamine Oxidase Inhibitor (MAOI) [DailyMed, Health Canada].
Age-Related Rules Use is not recommended for children under 2 years (oral form) and is contraindicated for neonates (injectable form).
Condition-Specific Rules Use requires caution in patients with prostatic hypertrophy, urinary retention, bronchial asthma, certain gastrointestinal obstructions, and cardiac arrhythmias.
Pregnancy and Lactation Pregnancy Category B; use is only advised if clearly needed. The drug is excreted in breast milk, requiring a regulatory decision to discontinue nursing or discontinue the drug [DailyMed].

Connection to the overall eligibility profile Regulatory documents define who can and cannot use the medicine by establishing clear boundaries across the lifespan and against specific patient-level constraints. This structure separates approved populations from those who are formally contraindicated or require explicit caution due to conditions that may be aggravated by the drug's properties, adhering strictly to government-approved labeling.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documents define the interaction profile of Trawell (Dimenhydrinate) primarily through pharmacodynamic additive effects involving the central nervous system (CNS) and anticholinergic activity. The medicine must not be combined with substances that increase these effects or with drugs that can mask key warning symptoms.

Documented Interaction Patterns

Category Interacting Agents / Substances Documented Interaction Outcome
Additive CNS Depression Alcohol (Ethanol), Opioids, Sedatives, Hypnotics, Anxiolytics, Antipsychotics Increases drowsiness, sedation, and potential for respiratory depression.
Anticholinergic Synergy Tricyclic Antidepressants, MAO Inhibitors (used within 14 days), Antipsychotics Leads to increased risk of anticholinergic effects (e.g., blurred vision, dry mouth).
Ototoxicity Masking Ototoxic Antibiotics (e.g., Aminoglycosides) Dimenhydrinate is officially capable of masking symptoms (like dizziness) of inner ear damage, preventing detection.

Co-administration with Monoamine Oxidase Inhibitors (MAOIs) is a formal restriction in some labeling, often requiring a separation period of 14 days. Certain Class I and Class III Antiarrhythmics (e.g., Amiodarone, Quinidine) are also cited as contraindicated combinations due to the risk of increased cardiac arrhythmias. Regulatory labels also contain a high-level statement that CYP3A inhibitors or inducers may affect Dimenhydrinate's exposure, though specific clinical restrictions based solely on this pharmacokinetic pattern are not universally mandated. Cautions regarding heightened interaction severity are specifically noted for the elderly population and pediatric patients due to increased susceptibility to sedation and paradoxical excitation, respectively.

Mechanism of Action

Trawell's action is fundamentally based on modulating key neurotransmitter systems in the central nervous system ( CNS), which process vestibular and emetic responses.

Central mathbfH1 and Muscarinic Receptor Modulation

The drug works by engaging in competitive antagonism of both the Histamine mathbfH1 and Muscarinic Cholinergic receptors in the brain. This molecular action modulates the activity of these two central neurotransmitter systems, which are components of the physiological pathways that relay motion-related neural impulses. The resulting physiological effect is a decreased transmission of neural input within the CNS structures processing vestibular information.

Modification of the Vestibular-Emesis Pathway

By decreasing activity via receptor blockade, the mechanism targets the Vestibular Nuclei and the central Vomiting Center ( CTZ). This directly limits the transmission of signals from the inner ear's balance organs, thereby modifying the signal transmission within the emetic reflex arc cascade. This cascade-level interference results in a state of decreased responsiveness and a modification of signal transmission within the motion-sensitive neurological pathways.

Mechanistic Role of Combination Components

Trawell's mechanism involves two components: the primary blocker, Diphenhydramine, provides the receptor antagonism, while the mild CNS stimulant, 8-Chlorotheophylline, acts as an Adenosine receptor antagonist. This secondary action introduces a mechanistic counteraction that modulates the physiological impact of the primary component's inherent CNS depression, allowing for independent operation of the receptor antagonism pathway.

Dosage and Administration Information

Administration and Dosing Principles

The usage of Trawell (Dimenhydrinate) follows specific administration principles and dosing schedules for the management of motion-induced symptoms.

Approved Routes and Timing

The medicine is administered via the oral route (tablet, chewable, or solution) and, for clinical needs, the parenteral route (Intramuscular or Intravenous injection), along with a rectal suppository form.

For preventative use, the first dose must be taken according to a prophylactic timing rule, which instructs administration one-half to one hour before the travel or activity begins. Subsequent doses are taken on an as-needed basis, and the oral forms may be taken with or without food.

Standard Dosage and Population Rules

Dosing is stratified by age, and all regimens are constrained by a strict 24-hour maximum dose. The adult dose (12 years and over) is 50 mg to 100 mg every 4 to 6 hours, not to exceed 400 mg in 24 hours.

Age Group Single Dose Frequency (As Needed) Max 24-Hour Dose
6 to <12 years 25 mg to 50 mg Every 6 to 8 hours 150 mg
2 to <6 years 12.5 mg to 25 mg Every 6 to 8 hours 75 mg

When the drug is administered intravenously, the solution must be diluted with 0.9% Sodium Chloride and infused slowly over a period of at least two minutes to meet procedural guidelines.

Recent Clinical Evidence

Research evidence / Overview of studies for Trawell (Dimenhydrinate)


Evidence Summary for Motion Sickness Prevention (Kinetosis)

Research involving Trawell (Dimenhydrinate) has focused on research exploring the prevention of motion sickness before symptoms begin. These investigations primarily use Randomized Controlled Trials (RCTs) and systematic reviews. Studies have been used in research exploring how symptoms change over time when people are exposed to motion, both in natural travel settings—such as on boats—and in controlled, laboratory-induced settings.

The research examined outcomes related to physical discomfort, specifically aiming to measure the proportion of participants who remained symptom-free during motion exposure. Trials also monitored patient experiences by measuring nausea symptom scores and tracking the time until symptoms became noticeable. The findings describe patterns observed in these studies, indicating the medicine was evaluated in research settings that simulated travel conditions. Follow-up durations were limited to these short periods of exposure.


Research for Vertigo and Related Vestibular Symptoms

Trawell was also evaluated in research settings exploring conditions characterized by fluctuating or episodic manifestations of dizziness and vertigo, which are related to systemic or functional imbalance stemming from the inner ear. Randomized Controlled Trials (RCTs) were applied in studies examining patient-reported experiences in adult patients diagnosed with various forms of vestibular vertigo.

These studies used in research exploring how symptoms change over time by measuring validated outcomes such as the Mean Vertigo Score (MVS), which tracks measured changes in the frequency and intensity of spinning or imbalance. It is important to note that a significant portion of recent research for these specific vestibular conditions was observed in some studies that evaluated Dimenhydrinate as a component within a fixed-dose combination with another compound, Cinnarizine.


Evidence Gaps and Areas of Uncertainty

Long-term data are not fully established across all contexts of use. Research provides insight into short-term changes, but there is limited information for long-term outcomes or how use over extended periods may relate to the body’s ability to naturally adapt and overcome balance issues. Furthermore, evidence available for the pediatric population (children) remains limited.

Key Studies & References

  1. Dimenhydrinate: MedlinePlus Drug Information (for general purpose and clinical use context)
  2. Summary Review (Dimenhydrinate): Health Canada Drug Product Database (example regulatory evaluation context)

Frequently Asked Questions (FAQ)

Common questions about Trawell (FAQ)


Q: Is Trawell considered a long-term medication or a short-term treatment?

Official product information indicates that research studies for Trawell have primarily examined short-term exposures to the medicine. Consequently, evidence and information regarding the outcomes of long-term use over extended periods are currently limited.


Q: What is the expected duration of effect after a single standard use of Trawell?

Regulatory dosing guidelines for adults define the frequency for subsequent administration, which is typically every 4 to 6 hours. This established time frame reflects the regulatory maximum frequency for repeat dosing.


Q: Is Trawell a medication that can be stopped and re-started as needed, or must it be taken consistently?

For the drug's approved purpose, administration is often based on need. Subsequent doses, following the initial preventative one, are officially taken on an as-needed basis rather than requiring a continuous daily schedule.


Q: Does Trawell need to be taken at the exact same time every day?

Regulatory documents do not mandate that Trawell be taken at a fixed time every day. Since its use is commonly prophylactic (preventative) or as-needed, the timing is flexible, and the medicine may be taken with or without food.


Q: Are there any specific foods or beverages that are officially recommended to be avoided while using Trawell?

Official product information states that the medicine may be taken with or without food. However, regulatory labeling explicitly documents an increased risk of side effects due to additive effects when Trawell is combined with alcohol.


Q: Is Trawell generally considered appropriate for use by older adults?

Official safety statements note that older adults may experience increased sensitivity to some adverse effects. These include dizziness, sedation, and a reduction in blood pressure. Regulatory caution is also specifically noted regarding drug interactions in this population.


Q: Can someone with high blood pressure or heart conditions use Trawell?

Official eligibility maps indicate that the use of Trawell requires specific caution in patients who have pre-existing cardiac arrhythmias. Regulatory documents do not specifically list general high blood pressure (hypertension) as a formal restriction for use.


Q: Is Trawell a mood stabilizer or antidepressant, as sometimes discussed online?

According to official regulatory classification, Trawell is defined as a First-Generation Antihistamine. It is functionally designated as an anti-emetic agent, meaning its primary purpose is to counteract symptoms like nausea and vomiting.


Q: Where can I find the official clinical research evidence for Trawell?

Authoritative resources, such as government health agency publications, describe the body of evidence supporting the use of Trawell. This evidence is generally based on the findings from specific types of research studies, including Randomized Controlled Trials (RCTs) and systematic reviews.


Q: What does the term 'contraindication' mean in the context of using Trawell?

A contraindication is a formal restriction defined by regulatory bodies. It is a condition, patient history, or concurrent medicine use that strictly prohibits the use of Trawell because it would create an unacceptable risk.


Q: What kind of warning labels are on Trawell regarding operating machinery or driving?

Official regulatory documents list several frequently reported effects on the Central Nervous System (CNS) that are relevant to warning labels. These include documented effects such as drowsiness, sedation, dizziness, and blurred vision, which are the documented basis for regulatory warnings regarding operating machinery or driving.


Q: Can Trawell potentially cause stomach upset or nausea?

The official safety profile includes documentation of adverse reactions affecting the gastrointestinal system. Specifically, nausea and vomiting are listed among the possible side effects.


Q: Does Trawell affect a person's sleep patterns?

Official information documents that the medicine has Central Nervous System (CNS) effects. The most frequently reported effect is drowsiness (somnolence) or sedation, both of which are related to sleep.


Q: Why do some people experience initial sleep disturbances when starting Trawell?

While the medicine is commonly associated with drowsiness, regulatory documents note that it can also cause paradoxical CNS stimulation in some individuals. This stimulation may manifest as excitation, agitation, or restlessness, which could potentially disrupt sleep.


Q: What research supports Trawell's use in different populations, such as children or the elderly?

Research has provided insight into Trawell's short-term use in adults. However, official regulatory summaries note that the evidence available specifically for the pediatric population (children) remains limited across all contexts of use.


Q: Can Trawell affect a person's emotional state?

The official safety profile includes documentation of adverse reactions related to Central Nervous System (CNS) stimulation. These documented effects include excitation, agitation, and restlessness.


Q: Is there a maximum official duration for Trawell use described in the regulatory documents?

Regulatory documents define a strict maximum dose that can be taken within a 24-hour period. However, they do not specify a maximum duration (such as a number of days or weeks) for the entire course of medicine use.


Q: I heard Trawell can cause weight gain; is that listed as a side effect?

Weight gain is not listed among the adverse reactions officially documented and classified by frequency or affected body system in the regulatory safety profile.

How should Trawell be stored and disposed of?

How to Store and Dispose of Trawell

The storage and disposal of Trawell (dimenhydrinate) tablets must strictly follow regulatory guidelines to maintain stability and ensure safety.

Storage Requirements

Condition Regulatory Requirement
Temperature Store at controlled room temperature, typically 20 C to 25 C (68 F to 77 F).
Protection Keep the medicine in the original, tightly closed container and protect it from moisture and excess heat.
Child Safety Mandatory to keep the medication out of the sight and reach of children.
Integrity Do not use the product if the outer packaging or the blister is broken.

Disposal Instructions

Unused or expired tablets should not be flushed down the toilet or disposed of in wastewater. The preferred method is to utilize a drug take-back program, such as a pharmacy kiosk or authorized collector. If a take-back program is unavailable, the tablets must be mixed with an undesirable substance (e.g., used coffee grounds) and placed in a sealed bag before being disposed of in the household trash. Personal information must be removed from the container before disposal.

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

Available in countries:

Equivalent of Trawell found in:

A-Z Index: