chemistry

Tiagabine

Tiagabine is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tiagabine rather than just read about it. In short: Tiagabine, sold under the brand name Gabitril, is an anticonvulsant medication which is used in the treatment of epilepsy. It is also used off-label in the treatment of insomnia and anxiety disorders.

Key takeaways

Tiagabine belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tiagabine to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tiagabine from memory before moving on to harder problems.

Reference excerpt

Tiagabine, sold under the brand name Gabitril, is an anticonvulsant medication which is used in the treatment of epilepsy. It is also used off-label in the treatment of insomnia and anxiety disorders. However, off-label use is discouraged as the drug has been associated with new-onset seizures in people without epilepsy. Tiagabine is taken orally. Side effects of tiagabine include dizziness, asthenia, non-specific nervousness, muscle tremors, diarrhea, depression, and emotional lability. The drug acts as a selective GABA transporter 1 (GAT-1) blocker or GABA reuptake inhibitor, and hence acts as an indirect GABA receptor agonist, increasing GABAergic signaling in the brain. It may increase activation of both GABAA and GABAB receptors. The effects of tiagabine on sleep resemble those of GABAA receptor agonists like gaboxadol and muscimol, primarily enhancing slow wave sleep, and differ from those of GABAA receptor positive allosteric modulators like benzodiazepines and Z drugs. The drug's elimination half-life is 4.5 to 9 hours, but can be shorter in people taking enzyme-inducing anticonvulsants. Tiagabine was discovered in 1988 and was introduced for medical use in 1997. Generic formulations have become available. The drug is not a controlled substance in the United States.

Medical uses

Epilepsy Tiagabine is approved by the United States Food and Drug Administration (FDA) as an adjunctive treatment for partial seizures in epilepsy in individuals of age 12 and up. It is effective as monotherapy and combination therapy with other anticonvulsant drugs in the treatment of partial seizure.

Other uses

Insomnia Tiagabine is used in the treatment of insomnia. Lower doses than those used in epilepsy, in the range of 2 to 16 mg, are used to treat insomnia. The drug has been found to enhance slow wave sleep (SWS) in the context of insomnia. Its effects on SWS are dose dependent, with a 2- to 4-fold increase in SWS at doses of 8 to 16 mg but mixed findings for a dose of 4 mg. Findings are mixed in terms of the influence of tiagabine on sleep onset, sleep duration, nighttime awakenings, self-reported sleep ratings, and ratings of restorative or refreshing sleep. Tiagabine has been found to decrease the cognitive impairment and high cortisol levels caused by sleep restriction, with this being related to the drug's SWS improvement. On the other hand, despite increasing SWS, tiagabine did not improve memory consolidation. The effects of tiagabine on sleep, for instance primarily increasing SWS, resemble those of gaboxadol and muscimol but are very different from those of conventional GABAA receptor positive allosteric modulators like benzodiazepines and Z drugs. The American Academy of Sleep Medicine's 2017 clinical practice guidelines recommended against the use of tiagabine in the treatment of insomnia due to limited effectiveness and very low quality of evidence.

Anxiety disorders Tiagabine may be prescribed off-label to treat certain anxiety disorders, such as panic disorder and social anxiety disorder. Tiagabine may be used alongside selective serotonin reuptake inhibitors (SSRIs), serotonin–norepinephrine reuptake inhibitors (SNRIs), or benzodiazepines for anxiety. The drug was ineffective for generalized anxiety disorder.

Neuropathic pain Tiagabine can be used in the treatment of neuropathic pain. It can be used alongside antidepressants, gabapentin, other anticonvulsants, or opioids for neuropathic pain.

Available forms Tiagabine is available in the form of 2, 4, 5, 10, 12, 15, and 16 mg oral tablets. The drug is taken 1 to 4 times per day due to its short elimination half-life. A sustained-release formulation would be advantageous but has not been developed or marketed.

Contraindications Contraindications of tiagabine include hypersensitivity (drug allergy) to tiagabine or its ingredients and severe hepatic impairment. The drug should be avoided in pregnant and nursing women.

Side effects Side effects of tiagabine are dose-related. The most common side effect of tiagabine is dizziness. Other side effects that have been observed with a rate of statistical significance relative to placebo include asthenia, somnolence, nervousness, memory impairment, tremor, headache, diarrhea, and depression. Adverse effects such as confusion, aphasia, stuttering, and paresthesia (a tingling sensation in the body's extremities, particularly the hands and fingers) may occur at higher dosages of the drug (e.g., over 8 mg/day). Tiagabine has been associated with new-onset seizures and status epilepticus in people without epilepsy in post-marketing surveillance. This may be dose-related, although it has been reported at doses of as low as 4 mg/day, and may also be related to concomitant use of other medications that lower the seizure threshold. Some of these seizures occurred around the time of dose increases. There may be an increased risk of psychosis with tiagabine treatment, although data is mixed and inconclusive. Tiagabine can also reportedly interfere with visual color perception. It has not been found to cause psychomotor, cognitive, or memory impairment. Unlike certain other GABAergic drugs like muscimol, gaboxadol, and CI-966, tiagabine has not been associated with hallucinogenic effects.

Overdose Tiagabine overdose can produce neurological symptoms such as lethargy, single or multiple seizures, status epilepticus, coma, confusion, agitation, tremors, dizziness, dystonias, abnormal posturing, and hallucinations, as well as respiratory depression, tachycardia, and hypertension or hypotension. Overdose may be fatal especially if the victim presents with severe respiratory depression or unresponsiveness.

Interactions Combination of tiagabine with enzyme-inducing anticonvulsants like carbamazepine, phenytoin, primidone, and phenobarbital can decrease the elimination half-life of tiagabine to as low as 2 to 3 hours. Conversely, tiagabine does not significantly affect the hepatic metabolism of other anticonvulsants such as carbamazepine, phenytoin, and valproic acid. Other interactions have also been reviewed.

Pharmacology

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Tiagabine

Start with the simplest possible case. Write down what Tiagabine claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tiagabine before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tiagabine ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tiagabine

In research: Tiagabine appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tiagabine in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tiagabine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anticonvulsants, Anxiolytics, Carboxylic acids, so understanding it makes those chapters shorter.
In everyday life: Look for Tiagabine outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Tiagabine” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Tiagabine in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tiagabine means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Tiagabine out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tiagabine in simple terms?

Why does Tiagabine matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tiagabine?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tiagabine.