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Onex 2.5mg Tablet

Written By Dr. Anuj Saini, MMST, MBBS
Reviewed By Dr. Mekhala Chandra, MD, MBBS
Last updated on 25 Nov 2025 | 11:43 PM (IST)
Onex 2.5mg Tablet is used in the treatment of schizophrenia (a mental disorder that can result in hallucinations or delusions and also adversely affects a person’s ability to think and behave) and mania.
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Meltolan 2.5mg Tablet
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Onex 2.5mg Tablet
Onex 2.5mg Tablet
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Same composition
Meltolan 2.5mg Tablet
Meltolan 2.5mg Tablet
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Olanzapine (2.5mg)
by Alkem Laboratories Ltd
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₹52.4
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General Information

Contains

Olanzapine (2.5mg)

Marketer

Theo Pharma Pvt Ltd

Storage

Store below 30°C
The content is shown in English
Onex 2.5mg Tablet image
Onex 2.5mg Tablet image

Product introduction

Onex 2.5mg Tablet may be taken with or without food. However, it is advised to take it at the same time each day as this helps to maintain a consistent level of medicine in the body. Take this medicine in the dose and duration as advised by your doctor and if you have missed a dose, take it as soon as you remember. This medication mustn't be stopped suddenly without talking to your doctor as it may worsen your symptoms.

Some common side effects of this medicine include dryness in the mouth, constipation, muscle rigidity, and restlessness. Initially, this medicine may cause a sudden drop in blood pressure when you change positions, so it is better to rise slowly if you have been sitting or lying down. It also causes dizziness and sleepiness, so do not drive or do anything that requires mental focus until you know how this medicine affects you.

However, this medicine may increase your weight, blood sugar, and cholesterol levels but, modifying your lifestyle by having a healthy diet and exercising regularly can reduce this side effect. You should be cautious as in rare cases it may cause serious side effects like very high blood sugar levels or seizures.

Uses of Onex Tablet

Benefits of Onex Tablet

Treatment of Mania
Mania means extremely excited or elevated mood. Onex 2.5mg Tablet helps calm the mood and relax the nerves. This stabilises the mood and prevents the symptoms of mania from recurring again. Taking Onex 2.5mg Tablet will ensure that you have a better social life and are able to do daily activities more comfortably.
Schizophrenia
Schizophrenia is a mental disorder in which a person’s thinking ability, feelings and behavior become abnormal. Onex 2.5mg Tablet helps restore the chemical imbalances in the brain that are responsible for such changes. It improves thoughts, behavior and enhances the quality of life.

Side effects of Onex Tablet

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them
Common side effects of Onex
  • Increased appetite
  • Increased liver enzymes
  • Constipation
  • Extrapyramidal symptoms
  • Weakness
  • Weight gain
  • Sleepiness
  • Increased prolactin level in blood
  • Altered blood lipid level
  • Increased glucose level in blood
  • Anticholinergic effects
  • Decreased white blood cell count (neutrophils)
  • Dizziness

How to use Onex Tablet

Take this medicine in the dose and duration as advised by your doctor. Swallow it as a whole. Do not chew, crush or break it. Onex 2.5mg Tablet may be taken with or without food.

How Onex Tablet works

Onex 2.5mg Tablet is an atypical antipsychotic. It works by affecting the levels of chemical messengers (dopamine and serotonin) to improve mood, thoughts and behavior.

All substitutes for Onex 2.5mg Tablet

For information purposes only. Consult a doctor before taking any medicine.

OleANZ 2.5 Tablet

by Sun Pharmaceutical Industries Ltd
₹4.74/tablet
155% costlier
<h3 class=bodySemiBold>OleANZ 2.5 Tablet</h3>

Oliza 2.5 Tablet

by Intas Pharmaceuticals Ltd
₹4.75/tablet
155% costlier
<h3 class=bodySemiBold>Oliza 2.5 Tablet</h3>

Olanex 2.5 Tablet

by Eris Lifesciences Ltd
₹4.43/tablet
138% costlier
<h3 class=bodySemiBold>Olanex 2.5 Tablet</h3>

OlAN 2.5 Tablet

by Micro Labs Ltd
₹3.22/tablet
73% costlier
<h3 class=bodySemiBold>OlAN 2.5 Tablet</h3>

Olay 2.5 Tablet

by Talent India
₹3.64/tablet
96% costlier
<h3 class=bodySemiBold>Olay 2.5 Tablet</h3>

Quick tips

  • Onex 2.5mg Tablet works well in schizophrenia and bipolar disorder.
  • It is less likely to cause heart and movement problems as compared to other similar medicines.
  • It may take 4 to 6 weeks to see full effects on thoughts and mood. Keep taking it as prescribed.
  • Use caution while driving or doing anything that requires concentration as Onex 2.5mg Tablet can cause dizziness and sleepiness.
  • It may increase your weight, blood sugar and cholesterol. Eat healthy, exercise regularly and monitor your blood levels regularly.
  • To lower the chance of feeling dizzy or passing out, rise slowly if you have been sitting or lying down.
  • Do not stop taking Onex 2.5mg Tablet without talking  to your doctor first as it may cause worsening of symptoms.

Safety advice

Alcohol

Alcohol

CAUTION
Alcohol should be used with caution while taking Onex 2.5mg Tablet.
Pregnancy

Pregnancy

CONSULT YOUR DOCTOR
The safety of Onex 2.5mg Tablet during pregnancy has not been established. There are no adequate and well-controlled studies in pregnant women, and animal data on reproductive toxicity are insufficient. Your doctor will weigh the benefits and any potential risks before prescribing.
Breast feeding

Breast feeding

UNSAFE
Onex 2.5mg Tablet is unsafe to use during breastfeeding. Data suggests that the drug may cause toxicity to the baby.
Driving

Driving

UNSAFE
Onex 2.5mg Tablet may decrease alertness, affect your vision, or make you feel sleepy and dizzy. Do not drive if these symptoms occur.
Kidney

Kidney

CAUTION
Onex 2.5mg Tablet should be used with caution in patients with severe kidney disease. Dose adjustment may be needed.
Liver

Liver

CAUTION
Onex 2.5mg Tablet should be used with caution in patients with liver disease. Dose adjustment may be needed.

Interaction with drugs

Taking Onex with any of the following medicines can modify the effect of either of them and cause some undesirable side effects
Life-threatening

Domperidone (Oral Route)

Do not consume Domperidone with Olanzapine.
Severe

Amiodarone (Oral Route)

Factors such as old age, chronic heart issues, or low potassium levels may more frequently cause disturbance in heart rhythm, and your doctor may consider ECG monitoring in their presence.
Severe

Haloperidol (Oral Route)

Factors such as old age, chronic heart issues, or low potassium levels may more frequently cause disturbance in heart rhythm, and your doctor may consider ECG monitoring in their presence.
Severe

Haloperidol (Injection Route)

Factors such as old age, chronic heart issues, or low potassium levels may more frequently cause disturbance in heart rhythm, and your doctor may consider ECG monitoring in their presence.
Severe

Pimozide (Oral Route)

Factors such as old age, chronic heart issues, or low potassium levels may more frequently cause disturbance in heart rhythm, and your doctor may consider ECG monitoring in their presence.

Frequently asked questions

The treatment of anxiety with Onex 2.5mg Tablet is not an approved indication. Onex 2.5mg Tablet has been studied for treatment of anxiety disorders but the results have not been very convincing. However, it can be used along with anxiolytics in anxiety disorders for better results.
No, Onex 2.5mg Tablet is not a sleeping pill. It belongs to the atypical antipsychotic class of medicines. It is used to treat schizophrenia. Schizophrenia is a mental illness that causes disturbed or unusual thinking, loss of interest in life, and strong or inappropriate emotions. Onex 2.5mg Tablet also helps with bipolar disorder (manic depressive disorder). It is a disease that causes episodes of depression, mania, and other abnormal moods.
Onex 2.5mg Tablet may start showing initial improvement within 1-2 week of starting. However, for full benefits it may take about 4-6 weeks. You should continue taking it and consult your doctor in case you feel that Onex 2.5mg Tablet is not helping you.
Onex 2.5mg Tablet can cause serious side effects which include increased risk of death in elderly people who are confused, have memory loss and have lost touch with reality (dementia-related psychosis). It is important to know that it may increase blood sugar levels in diabetics and also in patients who never had diabetes. Furthermore, it may cause weight gain and high fat levels in the blood which is more common in teenagers.
Onex 2.5mg Tablet should be avoided during pregnancy and should only be given if benefits outweigh the risk. Using Onex 2.5mg Tablet during last 3 months of pregnancy may cause unwanted symptoms in the unborn baby. These symptoms include shaking, muscle stiffness and/or weakness, sleepiness, agitation, breathing problems, and difficulty in feeding.
You should not stop taking Onex 2.5mg Tablet without consulting your doctor. This is because sudden discontinuation of the medicine may cause unpleasant side effects which include sweating, unable to sleep, tremor, anxiety or nausea, and vomiting. To avoid such effects, your doctor will reduce the dose gradually before stopping the treatment.
Yes, smoking interferes with working of Onex 2.5mg Tablet causing an increase in its metabolism. One should avoid alcohol while taking Onex 2.5mg Tablet since it may cause more drowsiness. However, if you are a smoker then your doctor may increase your dose depending on your response to treatment.
The treatment of anxiety with Onex 2.5mg Tablet is not an approved indication. Onex 2.5mg Tablet has been studied for treatment of anxiety disorders but the results have not been very convincing. However, it can be used along with anxiolytics in anxiety disorders for better results.
No, Onex 2.5mg Tablet is not a sleeping pill. It belongs to the atypical antipsychotic class of medicines. It is used to treat schizophrenia. Schizophrenia is a mental illness that causes disturbed or unusual thinking, loss of interest in life, and strong or inappropriate emotions. Onex 2.5mg Tablet also helps with bipolar disorder (manic depressive disorder). It is a disease that causes episodes of depression, mania, and other abnormal moods.
Onex 2.5mg Tablet may start showing initial improvement within 1-2 week of starting. However, for full benefits it may take about 4-6 weeks. You should continue taking it and consult your doctor in case you feel that Onex 2.5mg Tablet is not helping you.
Onex 2.5mg Tablet can cause serious side effects which include increased risk of death in elderly people who are confused, have memory loss and have lost touch with reality (dementia-related psychosis). It is important to know that it may increase blood sugar levels in diabetics and also in patients who never had diabetes. Furthermore, it may cause weight gain and high fat levels in the blood which is more common in teenagers.
Onex 2.5mg Tablet should be avoided during pregnancy and should only be given if benefits outweigh the risk. Using Onex 2.5mg Tablet during last 3 months of pregnancy may cause unwanted symptoms in the unborn baby. These symptoms include shaking, muscle stiffness and/or weakness, sleepiness, agitation, breathing problems, and difficulty in feeding.
You should not stop taking Onex 2.5mg Tablet without consulting your doctor. This is because sudden discontinuation of the medicine may cause unpleasant side effects which include sweating, unable to sleep, tremor, anxiety or nausea, and vomiting. To avoid such effects, your doctor will reduce the dose gradually before stopping the treatment.
Yes, smoking interferes with working of Onex 2.5mg Tablet causing an increase in its metabolism. One should avoid alcohol while taking Onex 2.5mg Tablet since it may cause more drowsiness. However, if you are a smoker then your doctor may increase your dose depending on your response to treatment.

Fact Box

Chemical Class

Benzodiazepines

Habit Forming

No

Therapeutic Class

NEURO CNS

Action Class

Atypical Antipsychotics

References

  1. Stahl SM, editor. Olanzapine. In: Stahl's Essential Pschopharmacology: Prescriber's Guide. 5th ed. New York, New York: Cambridge University Press; 2014. pp. 485-92.
  2. Briggs GG, Freeman RK, editors. A Reference Guide to Fetal and Neonatal Risk: Drugs in Pregnancy and Lactation. 10th ed. Philadelphia, PA: Wolters Kluwer Health; 2015. pp. 1013-16.
  3. Drugs and Lactation Database (LactMed) [Internet]. Bethesda (MD): National Library of Medicine (US); 2006. Olanzapine. [Updated 2018 Oct 31]. [Accessed 20 Feb. 2020] (online) Available from:
  4. Olanzapine. Indianapolis, Indiana: Lilly USA; 1996. [Accessed 25 Mar. 2019] (online) Available from:
  5. Olanzapine [Patient Information Sheet]. Gangtok, Sikkim: Torrent Pharmaceuticals Ltd.; 2022. [Accessed 28 Mar. 2023] (online) Available from:
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Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Marketer details

Name: Theo Pharma Pvt Ltd
Address: Theo Pharma Pvt Ltd, 401, Sachet-3, Mirambica School Road, Naranpura, Naranpura

Vendor Details

Country of origin: India

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