Zotepine is available in India as tablets of 25 mg, 50 mg and 100 mg strength, as recorded by the Central Drugs Standard Control Organisation (CDSCO). It belongs to a group of medicines called atypical (second-generation) antipsychotics and is chemically classed as a dibenzothiepine. Zotepine is prescribed mainly for schizophrenia, a long-term mental health condition that affects how a person thinks, feels, and behaves. It works by acting on several brain chemical messenger systems, particularly dopamine and serotonin, to help reduce symptoms such as hallucinations, delusions, and disorganised thinking. Zotepine has been used as an antipsychotic in Japan, Germany, and India for several decades, though it does not have marketing approval in the United States. It is meant to be taken only under the supervision of a psychiatrist, with the dose and duration decided based on the individual's response and tolerability.

Zotepine is an atypical antipsychotic that belongs to the dibenzothiepine chemical class. Unlike older, typical antipsychotics that mainly block dopamine receptors, Zotepine acts on a broader set of brain receptors. This gives it a distinct effect profile and is thought to lower the chance of certain movement-related side effects compared with older antipsychotic medicines, although this risk is not eliminated.

Zotepine is mainly prescribed for schizophrenia, a psychiatric condition where a person's thinking, emotions, and behaviour are affected, often leading to hallucinations, delusions, and difficulty functioning in daily life. By calming overactive signalling in certain brain pathways, Zotepine helps reduce these symptoms over time. It does not act instantly; most people need several weeks of consistent use before the full benefit is seen.

Zotepine tablets are manufactured in three strengths in India, 25 mg, 50 mg, and 100 mg, allowing the treating doctor to adjust the amount taken based on how a person responds and how well they tolerate the medicine. Because Zotepine affects the brain's chemical balance broadly, it needs regular medical supervision throughout treatment. This includes monitoring for movement-related side effects, changes in heart rhythm, blood sugar and cholesterol levels, and general mental state. Zotepine should never be started, stopped, or changed in dose without medical advice, since sudden changes can affect both symptom control and safety. People with a history of seizures, heart rhythm problems, liver disease, or certain other medical conditions need special caution and closer monitoring while taking this medicine, as described further in the sections below.

• Schizophrenia - Zotepine is used to manage the positive symptoms of schizophrenia, such as hallucinations and delusions, as well as negative symptoms like social withdrawal and reduced motivation.
• Acute psychotic episodes - It may be used during an acute flare-up of psychotic symptoms to help calm agitation, disordered thinking, and abnormal perceptions.
• Long-term maintenance therapy - Once symptoms are controlled, Zotepine may be continued at a lower, doctor-decided dose to help prevent relapse in people with schizophrenia.

1. Reduces psychotic symptoms - Zotepine helps calm hallucinations, delusions, and disorganised thinking associated with schizophrenia.
2. Eases negative symptoms - It may help with symptoms such as social withdrawal, low motivation, and blunted emotional expression that are harder to treat with some older antipsychotics.
3. Broader receptor action - Because Zotepine acts on both dopamine and serotonin pathways, along with other receptor systems, it can help address a wider range of symptoms than medicines that work on dopamine alone.
4. Available in flexible strengths - Tablets in 25 mg, 50 mg, and 100 mg allow the dose to be tailored gradually to individual response.

Common Side Effects (Usually Mild and May Lessen With Continued Use)

• Sleepiness or drowsiness
• Weakness or tiredness
• Dry mouth
• Constipation
• Weight gain
• Mild dizziness, especially on standing up quickly, a symptom of orthostatic hypotension (a drop in blood pressure that happens on standing up, which can cause dizziness or fainting)

Serious Side Effects (Seek Urgent Medical Attention)

• Extrapyramidal symptoms (EPS) - a group of movement-related side effects that can include muscle stiffness, restlessness that makes it hard to sit still (akathisia), and abnormal, sustained muscle spasms particularly of the face, neck, or eyes (dystonia). With longer-term use, some people can develop tardive dyskinesia, a distinct and potentially persistent condition involving repetitive, involuntary movements, often of the face, tongue, or limbs.
• Neuroleptic malignant syndrome (NMS) - a rare but life-threatening reaction to antipsychotic medicines, including Zotepine, marked by high fever, severe muscle rigidity, altered or confused consciousness, and autonomic instability (such as a fast heartbeat, sweating, and swings in blood pressure). This needs immediate emergency medical care.
• QT interval prolongation - Zotepine can affect the heart's electrical rhythm by prolonging what is called the QT interval, which in some people can lead to a serious, irregular heartbeat (arrhythmia). Symptoms to watch for include palpitations, fainting, or severe dizziness.
• Seizures - Zotepine can lower the seizure threshold, and the chance of a seizure rises with higher doses. People with a past history of seizures or head injury are at greater risk.
• Elevated prolactin levels - Zotepine can raise the blood level of the hormone prolactin, which may lead to menstrual cycle changes, unexpected breast milk production (galactorrhea), breast tenderness, or sexual difficulties in both men and women.
• Metabolic changes - Weight gain is one of the most commonly reported side effects of Zotepine. As with other atypical antipsychotics, Zotepine treatment has also been associated with changes in blood sugar levels and in cholesterol or lipid levels, which is why periodic monitoring of weight, blood sugar, and lipid profile is generally recommended during treatment.
• Increased heart rate and liver enzyme changes - Increased heart rate and raised liver enzyme levels have been reported with continued Zotepine treatment in clinical studies, so periodic blood tests are generally advised during long-term use.

Zotepine tablets are usually taken by mouth, generally in divided doses through the day as directed by the doctor. The tablet should be swallowed whole with a glass of plain water; it should not be crushed, chewed, or broken unless the doctor or pharmacist has specifically said this is acceptable for a particular brand. Zotepine may be taken with or without food, but it is helpful to be consistent, taking it the same way and around the same time each day, since this helps maintain a steady level of the medicine in the body. It is important to complete the full course exactly as prescribed and to keep taking the medicine even once symptoms improve, because stopping suddenly or skipping doses can cause symptoms to return or lead to withdrawal-type effects. Any decision to stop or change how Zotepine is taken should be made together with the prescribing doctor.

Zotepine works mainly by blocking dopamine receptors (particularly the D2 type) in certain areas of the brain, which helps reduce overactive dopamine signalling that is linked to hallucinations and delusions in schizophrenia. In simple terms, dopamine is a chemical messenger in the brain, and too much activity in certain dopamine pathways is thought to drive some psychotic symptoms.

What sets Zotepine apart from older antipsychotic medicines is that it does not act on dopamine alone. It also blocks serotonin receptors (mainly the 5-HT2A type), another chemical messenger system, which is thought to help with negative symptoms like low motivation and social withdrawal, and may lower the risk of some movement-related side effects compared with medicines that only block dopamine. In addition, Zotepine blocks histamine (H1) receptors, which can contribute to sleepiness, and alpha-adrenergic receptors, which can contribute to a drop in blood pressure on standing. It also blocks the reuptake of noradrenaline, another chemical messenger, back into nerve cells, which may add to its overall effect on mood and alertness. Because Zotepine acts on this wider set of receptors rather than one single target, its effects and its side-effect pattern are broader than a simple dopamine-blocking medicine.

• Take Zotepine at the same times each day to help maintain a steady effect.
• Swallow tablets whole with plain water.
• Do not stop taking Zotepine suddenly, even if you feel better, without speaking to your doctor.
• Report any new muscle stiffness, unusual movements, restlessness, or fever to your doctor promptly.
• Avoid alcohol while on this medicine.
• Stand up slowly from sitting or lying down to reduce dizziness.
• Keep all follow-up appointments so your doctor can monitor weight, blood sugar, cholesterol, and heart rhythm.

Store Zotepine tablets at room temperature, generally below 25 degrees C (77 degrees F), in a cool, dry place away from direct sunlight and moisture. Keep the medicine in its original container, away from the reach and sight of children and pets.

No specific major food interactions have been established for Zotepine in the available reference material. As a general precaution, it is best to maintain a consistent pattern of taking the medicine with regard to meals, and to avoid alcohol, since alcohol can increase drowsiness and dizziness caused by Zotepine.

• Other CNS depressants (sedatives, sleeping pills, opioid painkillers) - Combining these with Zotepine can increase sleepiness, dizziness, and the risk of slowed breathing.
• Other medicines that prolong the QT interval (certain heart rhythm medicines, some antibiotics, some other antipsychotics) - Combining these with Zotepine can add to the risk of serious heart rhythm disturbances.
• Other antipsychotics or antidepressants that lower seizure threshold - Combined use with Zotepine may increase the overall risk of seizures.
• Medicines that affect liver enzymes - Since Zotepine is broken down by liver enzymes, medicines that strongly increase or decrease the activity of these enzymes may change how much Zotepine is active in the body.
• Blood pressure medicines - Zotepine can lower blood pressure, particularly on standing, so combined use with blood pressure-lowering medicines may increase the risk of dizziness or fainting.

• Heart disease or known heart rhythm problems - Zotepine should be used with caution in people with existing heart rhythm disorders or heart disease, given its association with QT interval prolongation.
• Seizure disorders or history of seizures - Zotepine can lower the seizure threshold, so it should be used cautiously, and generally at a lower dose, in people with epilepsy or a past history of seizures.
• Liver disease - Since Zotepine is metabolised in the liver, liver impairment can affect how the medicine is processed and may require dose adjustment and monitoring.
• Kidney disease - People with significant kidney impairment need closer monitoring while on Zotepine.
• Diabetes or high cholesterol - Because Zotepine can affect blood sugar and lipid levels, it should be used cautiously in people who already have diabetes or high cholesterol, with regular monitoring.
• Dementia in elderly patients - Zotepine and other antipsychotics carry an increased risk of death when used for dementia-related behavioural symptoms in elderly patients, so this use needs careful specialist evaluation.

Zotepine is generally given in divided doses through the day, and published clinical studies have used total daily doses in the range of about 75 mg to 450 mg. The exact dose, frequency, and duration must always be decided by the treating doctor based on the individual's diagnosis, response, and tolerability, and should never be changed without medical advice.

Signs of a Zotepine overdose can include severe drowsiness, marked dizziness, fainting, a rapid or irregular heartbeat, severe muscle stiffness, and seizures. An overdose is a medical emergency, and the affected person should be taken to the nearest hospital or emergency department immediately for evaluation and supportive treatment.

If a dose of Zotepine is missed, take it as soon as it is remembered, unless it is almost time for the next scheduled dose. In that case, skip the missed dose and continue with the regular dosing schedule. Do not take two doses together to make up for a missed one.

Contact your doctor promptly if you notice any of the following while taking Zotepine:

• High fever, severe muscle stiffness, confusion, or irregular heartbeat and sweating (possible signs of neuroleptic malignant syndrome)
• Fainting, palpitations, or a sensation of a racing or irregular heartbeat
• A seizure or convulsion
• New or worsening restlessness, muscle spasms, tremor, or abnormal movements
• Unexplained breast milk production, menstrual changes, or sexual difficulties
• Significant weight gain, or symptoms of high blood sugar such as excessive thirst or urination
• Yellowing of the skin or eyes, or signs of liver trouble
• Any thoughts of self-harm or a marked worsening in mood