Related Experiment Video
Updated: May 16, 2026
Pentylenetetrazole-Induced Kindling Mouse Model
Published on: June 12, 2018
Trazodone reduces the anticonvulsant action of certain classical antiepileptics in the mouse maximal electroshock
Kinga K Borowicz1, Elwira Gurdziel, Stanisław J Czuczwar
1Independent Unit of Experimental Neuropathophysiology, Medical University, Jaczewskiego 8, PL 20-090 Lublin, Poland. kinga.borowicz@umlub.pl
Background:
The aim of the study was to examine effects of an acute and chronic treatment with trazodone, a serotonin antagonist and reuptake inhibitor (SARI), on the protective activity of four classical antiepileptic drugs provided in the maximal electroshock test in mice.
Methods:
Electroconvulsions were produced in mice by means of an alternating current (50 Hz, 25 mA, 0.2 s) and delivered via ear-clip electrodes. Motor impairment in animals were assessed in the chimney test, and long-term memory deficits were quantified in the passive-avoidance task. Brain concentrations of antiepileptic drugs were analyzed by fluorescence polarization immunoassay.
Results:
The obtained results showed that a single administration of trazodone (up to 40 mg/kg) did not influence the electroconvulsive threshold. In contrast, chronic treatment with the antidepressant (40 mg/kg) significantly increased this parameter. Furthermore, both single and chronic administration of trazodone reduced the anticonvulsant effect of phenytoin and carbamazepine against the maximal electroshock. However, the antidepressant remained without effect on the anticonvulsant action of valproate and phenobarbital. Some interactions between trazodone and antiepileptic drugs may have a pharmacodynamic background. Both, acute and chronic treatment with the antidepressant diminished the brain concentration of phenytoin. Chronic trazodone lowered the brain levels of carbamazepine and phenobarbital. Moreover, acute and chronic trazodone increased the valproate concentration in the brain. As regards undesired effects, acute and chronic trazodone (40 mg/kg), alone and in combination with phenytoin, significantly impaired long-term memory in tested animals, evaluated in the passive avoidance task. Acute trazodone (40 mg/kg) alone and combined with phenytoin produced also significant motor deficits in mice, as measured in the chimney test.
Conclusion:
The obtained results allow to conclude that trazodone is not a good candidate for an antidepressant drug in epileptic patients.
Insights
Trazodone, an antidepressant, may reduce the effectiveness of certain antiepileptic drugs and cause memory and motor deficits in epilepsy patients. Therefore, trazodone is not recommended for individuals with epilepsy.
Area of Science:
- Neuroscience
- Pharmacology
- Clinical Neurology
Background:
- Epilepsy management often involves antiepileptic drugs (AEDs).
- Trazodone is a serotonin antagonist and reuptake inhibitor (SARI) used as an antidepressant.
- Potential drug interactions between antidepressants and AEDs require investigation.
Purpose of the Study:
- To evaluate the effects of acute and chronic trazodone administration on the efficacy of four classical antiepileptic drugs.
- To assess trazodone's impact on anticonvulsant activity in a maximal electroshock test in mice.
- To investigate potential adverse effects of trazodone, including motor and memory impairments.
Main Methods:
- Maximal electroshock test in mice to assess anticonvulsant activity.
- Chimney test for motor impairment evaluation.
- Passive-avoidance task for long-term memory assessment.
- Fluorescence polarization immunoassay for brain drug concentration analysis.
Main Results:
- Chronic trazodone treatment increased the electroconvulsive threshold.
- Trazodone reduced the anticonvulsant effects of phenytoin and carbamazepine.
- Trazodone did not affect the anticonvulsant action of valproate and phenobarbital.
- Trazodone altered brain concentrations of all tested antiepileptic drugs.
- Trazodone caused significant long-term memory deficits and motor impairments.
Conclusions:
- Trazodone may interfere with the efficacy of certain antiepileptic drugs.
- Trazodone exhibits adverse effects on memory and motor function in mice.
- Trazodone is not a suitable antidepressant option for epileptic patients due to potential interactions and side effects.
Related Concept Videos
01:20Antiepileptic Drugs: Potassium Channel Activators
Ezogabine has gained approval as an adjunctive treatment...
01:17Antiepileptic Drugs: Calcium Channel Blockers
Calcium channel blockers exert their antiepileptic effects by targeting T-type calcium channels, which are integral to transmitting nerve signals in the central nervous system. These channels allow the passage of calcium ions, which are vital for neuronal communication. By inhibiting T-type calcium channels, calcium channel blockers effectively reduce the release of neurotransmitters and...
01:14Antiepileptic Drugs: Glutamate Antagonists
01:18Antiepileptic Drugs: GABAergic Pathway Potentiators
The key GABA pathway potentiators used in epilepsy management are as follows.
Benzodiazepines are a well-known class of drugs used for their...
01:24Epilepsy and Seizures: Overview
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...
01:08Antiepileptic Drugs: Sodium Channel Blockers
Sodium channel blockers modulate ion channels, particularly voltage-gated sodium channels. They block only sodium ion movement.
Among the most commonly prescribed antiepileptic drugs are...