chemistry

Trimipramine

Trimipramine 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 Trimipramine rather than just read about it. In short: Trimipramine, sold under the brand name Surmontil among others, is a tricyclic antidepressant (TCA) which is used to treat depression. It has also been used for its sedative, anxiolytic, and weak antipsychotic effects in the treatment of insomnia, anxiety disorders, and psychosis, respectively.

Key takeaways

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

Reference excerpt

Trimipramine, sold under the brand name Surmontil among others, is a tricyclic antidepressant (TCA) which is used to treat depression. It has also been used for its sedative, anxiolytic, and weak antipsychotic effects in the treatment of insomnia, anxiety disorders, and psychosis, respectively. The drug is described as an atypical or "second-generation" TCA because, unlike other TCAs, it seems to be a fairly weak monoamine reuptake inhibitor. Similarly to other TCAs, however, trimipramine does have antihistamine, antiserotonergic, antiadrenergic, antidopaminergic, and anticholinergic activities.

Medical uses Trimipramine's primary use in medicine is in the treatment of major depressive disorder, especially where sedation is helpful due to its prominent sedative effects. The drug is also an effective anxiolytic, and can be used in the treatment of anxiety. In addition to depression and anxiety, trimipramine is effective in the treatment of insomnia, and unlike most other hypnotics, does not alter the normal sleep architecture. In particular, it does not suppress REM sleep, and dreams are said to "brighten" during treatment. Trimipramine also has some weak antipsychotic effects with a profile of activity described as similar to that of clozapine, and may be useful in the treatment of psychotic symptoms, such as in delusional depression, schizoaffective disorder or schizophrenia. A major systematic review and network meta-analysis of medications for the treatment of insomnia published in 2022 found that trimipramine had an effect size (standardized mean difference (SMD)) against placebo for treatment of insomnia at 4 weeks of 0.55 (95% CITooltip confidence interval –0.11 to 1.21). The certainty of evidence was rated as very low, and no data were available for longer-term treatment (3 months). For comparison, the other sedating antihistamines assessed, doxepin and doxylamine, had effect sizes (SMD) at 4 weeks of 0.30 (95% CI –0.05 to 0.64) (very low certainty evidence) and 0.47 (95% CI 0.06 to 0.89) (moderate certainty evidence), respectively. The effective dosage of trimipramine in depression is 150 to 300 mg/day. Doses of trimipramine used for insomnia range from 25 to 200 mg/day. However, it has been advised that doses be kept as low as possible, and a low dose of 25 mg/day has been recommended.

Contraindications Contraindications include:

Recent myocardial infarction Any degree of heart block or other cardiac arrhythmias Mania Severe liver disease During breastfeeding Hypersensitivity to trimipramine or to any of the excipients

Side effects The side effects of trimipramine have been said to be similar to those of other tertiary amine TCAs, with a preponderance of anticholinergic and sedative effects. However, trimipramine has also been said to be associated with a different side effect profile compared to other TCAs and in general with fewer side effects, chiefly due to its lack of norepinephrine reuptake inhibition and relatively lower anticholinergic effects (although it is still a potent anticholinergic). Somnolence is the most common side effect of the drug. Dry mouth is the most common anticholinergic side effect, but others like constipation, urinary retention, and blurred vision are also present. Such effects, in any case, may be treated with bethanechol. It is described as being associated with minimal or no orthostatic hypotension, at least in comparison to clomipramine, in spite of its potent and comparable activity as an alpha-1 blocker. However, it has also been said to have a rate of orthostatic hypotension similar to that of other TCAs. Trimipramine is said to be less epileptogenic than other TCAs, although seizures have still been reported in association with it. It is also less cardiotoxic than other TCAs and cardiotoxicity is said to be minimal, with a "very favorable profile". Heavy exposure to any tricyclic antidepressants was associated with an elevated rate ratio for breast cancer 11–15 years later. However, on tests done on Drosophila melanogaster, nongenotoxic TCAs (amitriptyline, maprotiline, nortriptyline, and protriptyline), and genotoxic TCAs (amoxapine, clomipramine, desipramine, doxepin, imipramine, and trimipramine) were identified.

List of side effects Common adverse effects include:

Adverse effects with an unknown incidence includes:

Confusion Nausea Vomiting Extrapyramidal side effects (e.g. parkinsonism, dystonia, etc.) Tinnitus Paraesthesia ECG changes Increased liver function tests Rare adverse effects include:

Seizures Syndrome of inappropriate secretion of antidiuretic hormone Blood dyscrasias including: Agranulocytosis Thrombocytopenia Eosinophilia Leukopenia Myocardial infarction Heart block QTc interval prolongation Sudden cardiac death Depression worsening Suicidal ideation

Overdose

Compared to other TCAs, trimipramine is relatively safe in overdose, although it is more dangerous than the selective serotonin reuptake inhibitors (SSRIs) and serotonin–norepinephrine reuptake inhibitors (SNRIs) but less dangerous than bupropion in cases of overdose.

Interactions Trimipramine should not be given with sympathomimetic agents such as epinephrine (adrenaline), ephedrine, isoprenaline, norepinephrine (noradrenaline), phenylephrine and phenylpropanolamine. Barbiturates may increase the rate of metabolism. Trimipramine should be administered with care in patients receiving therapy for hyperthyrodism.

Pharmacology

Pharmacodynamics

The mechanism of action of trimipramine in terms of its antidepressant effects differs from that of other TCAs and is not fully clear. The mechanism of action of its anxiolytic effects is similarly unclear. Trimipramine is a very weak reuptake inhibitor of serotonin, norepinephrine, and dopamine (see below), and unlike most other TCAs, has been claimed to be devoid of clinically significant monoamine reuptake inhibition. The effects of the drug are thought to be mainly due to receptor antagonism as follows:

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Trimipramine

Start with the simplest possible case. Write down what Trimipramine 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 Trimipramine 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 Trimipramine 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 Trimipramine

In research: Trimipramine 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 Trimipramine 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: Trimipramine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alpha-1 blockers, Alpha-2 blockers, Antihistamines, so understanding it makes those chapters shorter.
In everyday life: Look for Trimipramine 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.

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How to study Trimipramine in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Trimipramine 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 Trimipramine out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Trimipramine in simple terms?

Why does Trimipramine 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 Trimipramine?

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 Trimipramine.