onsopil 4mg tablet - Ondansetron (4mg) medicine

Alset 4mg Tablet: Complete Guide to Uses, Side Effects, and Safety

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Ondansetron (4mg)
🏭 Psychotropics India Ltd 📦 Varies by brand 💊 Allopathy 📅 Updated: Sep 23, 2026
⚠️ Hepatotoxicity Risk 📋 Prescription Required 💊 Generic Available
Medically Reviewed
11 min read
Evidence: High for chemotherapy-induced, radiotherapy-induced, and post-operative nausea and vomiting.
Reviewed by
SaathiMed Expert Panel | Sep 23, 2026

When to Call Your Doctor IMMEDIATELY

  • Severe allergic reaction with swelling of the face, lips, tongue, or throat, or difficulty breathing.
  • Irregular or very fast heartbeat, palpitations, or fainting.
  • Chest pain or shortness of breath.
  • Severe dizziness or lightheadedness that does not go away.
  • Signs of serotonin syndrome such as agitation, confusion, rapid heart rate, high blood pressure, dilated pupils, muscle twitching, or diarrhoea.
  • Yellowing of the skin or eyes, or severe abdominal pain.
  • Persistent vomiting that prevents you from keeping fluids down.

If experiencing severe symptoms, call emergency services immediately.

What is onsopil 4mg tablet used for?

This medicine is an oral tablet containing Ondansetron 4 mg, used to prevent and treat nausea and vomiting caused by chemotherapy, radiotherapy, or surgery. It works by blocking serotonin 5-HT3 receptors in the gut and brain. It is usually taken 30 minutes before chemotherapy or 1 hour before surgery, as prescribed by a doctor.

  • Generic Name: Ondansetron (4mg)
  • Manufacturer: Psychotropics India Ltd
  • Form: Allopathy
  • Pregnancy Category: Consult doctor
  • Prescription Required: Yes

🇮🇳 onsopil 4mg tablet के बारे में (Hindi Summary)

उपयोग: यह दवा ओंडानसेट्रॉन 4 मिलीग्राम की मौखिक गोली है, जिसका उपयोग कीमोथेरेपी, रेडियोथेरेपी या सर्जरी के कारण होने वाली मतली और उल्टी को रोकने और इलाज करने के लिए किया जाता है। यह मस्तिष्क और आंतों में सेरोटोनिन 5-एचटी3 रिसेप्टर्स को ब्लॉक करके काम करती है। यह दवा आमतौर पर कीमोथेरेपी से 30 मिनट पहले या सर्जरी से 1 घंटा पहले डॉक्टर के निर्देशानुसार ली जाती है।

साइड इफेक्ट्स: इस दवा के आम दुष्प्रभावों में सिरदर्द, कब्ज, थकान, चक्कर आना और बेचैनी शामिल हैं। कुछ लोगों को फ्लशिंग, हिचकी या लीवर एंजाइम में मामूली वृद्धि हो सकती है। गंभीर लेकिन दुर्लभ दुष्प्रभावों में गंभीर एलर्जी, अनियमित दिल की धड़कन और सेरोटोनिन सिंड्रोम शामिल हैं। अधिकांश दुष्प्रभाव हल्के होते हैं और शरीर के अनुकूल होने पर ठीक हो जाते हैं।

सुरक्षा सलाह: इस दवा को डॉक्टर के बताए अनुसार ही लें। अपनी मर्जी से खुराक न बढ़ाएं या घटाएं। यदि आपको दिल की धड़कन की समस्या, लीवर की बीमारी, या पोटेशियम या मैग्नीशियम की कमी है, तो अपने डॉक्टर को बताएं। इस दवा को लेने के बाद चक्कर या थकान महसूस होने पर वाहन न चलाएं। गर्भावस्था, गर्भधारण की योजना या स्तनपान के दौरान डॉक्टर से सलाह लें।

💡 Did You Know? Over 80% of the antiretroviral drugs used globally to combat AIDS are supplied by Indian pharmaceutical companies.

💊 onsopil 4mg tablet Uses & Benefits

[{"condition":"Chemotherapy-induced nausea and vomiting","description":"This medicine is used to prevent and treat nausea and vomiting caused by cancer chemotherapy, especially highly emetogenic regimens.","evidence":"Well-established"},{"condition":"Radiotherapy-induced nausea and vomiting","description":"It helps control nausea and vomiting in patients receiving radiation therapy, particularly to the abdomen or pelvis.","evidence":"Well-established"},{"condition":"Post-operative nausea and vomiting","description":"This medicine is given to prevent and treat nausea and vomiting after surgery, either before or after the procedure.","evidence":"Well-established"},{"condition":"Severe nausea and vomiting from other causes","description":"It may be used for nausea and vomiting due to gastroenteritis, medications, or other medical conditions when other treatments are not effective.","evidence":"Moderate"}]

Off-label uses: [{"condition":"Hyperemesis gravidarum","description":"Sometimes prescribed off-label for severe nausea and vomiting of pregnancy when benefits outweigh risks, under close medical supervision.","evidence":"Limited"},{"condition":"Nausea and vomiting in palliative care","description":"May be used off-label to relieve nausea and vomiting in patients receiving palliative care for advanced illness.","evidence":"Limited"}]

Primary treatment for: Nausea and vomiting

Also treats: Chemotherapy-induced nausea and vomiting, Radiotherapy-induced nausea and vomiting, Post-operative nausea and vomiting

📋 Drug Information

Generic Name(s)Ondansetron (4mg)
Brand Nameonsopil 4mg tablet
ManufacturerPsychotropics India Ltd
Packaging / FormVaries by brand (Allopathy)
Therapeutic ClassGASTRO INTESTINAL
Action ClassSerotonin antagonists (5-HT3 antagonists)
Route of AdministrationOral
StorageStore at room temperature between 15°C and 30°C. Protect from light and moisture. Keep in the original container.
Shelf Life24 months from the date of manufacture, unless otherwise specified on the packaging.
WHO GuidelineNot established from the available information.
ICMR GuidelineNot established from the available information.

👨‍⚕️ Doctor's Practical Tips

Evidence-based practical advice from experienced clinicians

1
Take this medicine exactly as prescribed, usually 30 minutes before chemotherapy or 1 hour before surgery.
2
You can take this medicine with or without food, but taking it with a small snack may reduce stomach upset.
3
Drink plenty of fluids to stay hydrated, especially if you are vomiting.
4
Avoid driving or operating heavy machinery if you feel dizzy or tired after taking this medicine.
5
Do not take more than the prescribed dose, as higher doses may increase the risk of heart rhythm problems.
6
Inform your doctor if you have a history of heart problems, liver disease, or electrolyte imbalances.
7
Tell your doctor about all other medicines you are taking, especially those for depression, pain, or heart conditions.

🔍 Is This Medicine Right for Your Symptom?

Educational reference. Always consult a doctor for diagnosis.

✅
Nausea and vomiting after chemotherapy
This medicine is commonly prescribed for this.
Likely Use
✅
Nausea and vomiting after surgery
This medicine is commonly prescribed for this.
Likely Use
❌
Fever
This medicine is not a primary fever reducer.
Not Primary
❌
Headache
This medicine is not a primary headache treatment.
Not Primary

🔬 How This Medicine Works (Pharmacology)

Pharmacokinetics

AbsorptionThis medicine is well absorbed from the gastrointestinal tract after oral administration. The absolute bioavailability is approximately 60% to 70% in healthy adults, but it may be slightly higher in older adults. Food does not significantly affect the extent of absorption, but it may slightly increase the rate of absorption.
DistributionThis medicine is distributed widely throughout the body. It crosses the blood-brain barrier to reach the chemoreceptor trigger zone. Plasma protein binding is approximately 70% to 76%, mainly to albumin.
Protein BindingApproximately 70% to 76% bound to plasma proteins, primarily albumin.
MetabolismThis medicine is extensively metabolised in the liver by multiple cytochrome P450 enzymes, including CYP3A4, CYP2D6, and CYP1A2. The metabolites are largely inactive.
Half-LifeThe elimination half-life is approximately 3 to 6 hours in healthy adults. It may be prolonged in patients with severe liver impairment.
ExcretionThis medicine and its metabolites are excreted primarily in the urine (about 60%) and to a lesser extent in the faeces (about 40%).
BioavailabilityThe oral bioavailability is approximately 60% to 70% in healthy adults.
Onset of ActionAfter oral administration, this medicine usually begins to reduce nausea within 30 to 60 minutes.
Peak Plasma TimePeak plasma concentrations are reached approximately 1.5 to 2 hours after oral administration.
Duration of ActionThe antiemetic effect of a single oral dose usually lasts about 4 to 8 hours, depending on the individual and the cause of nausea.

How It Works

This medicine works by selectively blocking serotonin 5-HT3 receptors located on vagal nerve terminals in the gastrointestinal tract and in the chemoreceptor trigger zone of the brain. By blocking these receptors, it prevents serotonin from triggering the vomiting reflex. This action reduces both the sensation of nausea and the physical act of vomiting.

Mechanism Steps

1
Selective 5-HT3 receptor binding: This medicine binds with high affinity to serotonin 5-HT3 receptors on vagal afferent nerve endings in the gastrointestinal tract and in the chemoreceptor trigger zone of the area postrema in the brain.
2
Blockade of serotonin signalling: By occupying these receptors, it prevents serotonin released from enterochromaffin cells from activating the vomiting reflex.
3
Inhibition of vomiting reflex: This blockade reduces signals to the vomiting centre in the brainstem, thereby decreasing nausea and preventing vomiting.
4
Rapid onset of action: The blocking effect occurs quickly after oral administration, which makes this medicine useful for both prevention and treatment of nausea and vomiting.

💡 How to Take onsopil 4mg tablet

Strength: Immediate-release oral tablet, 4 mg

1Take this medicine by mouth with a glass of water.
2You may take it with or without food.
3Swallow the tablet whole; do not crush or chew unless advised by your doctor.
4Follow the dosing schedule exactly as prescribed.
5If you feel dizzy after taking it, lie down until the feeling passes.

Dosage Information

Adult DosageThe usual adult dose of this medicine for prevention of chemotherapy-induced nausea and vomiting is 8 mg taken orally 30 minutes before chemotherapy, followed by 8 mg every 12 hours for up to 2 days. For radiotherapy-induced nausea, 8 mg is taken 1 to 2 hours before each fraction. For post-operative nausea and vomiting, 16 mg is taken 1 hour before surgery. For treatment of established nausea, 4 mg to 8 mg may be taken. Dose must be individualized by a qualified clinician based on indication, age, weight, renal and hepatic function.
Pediatric DosagePediatric dosing is not established from available information. Consult a pediatrician.
Elderly DosageElderly patients may be more sensitive to the side effects of this medicine. No specific dose adjustment is usually required, but use with caution and monitor for dizziness, constipation, and heart rhythm changes.
Renal ImpairmentNo dose adjustment is usually required for mild to moderate kidney impairment. In severe kidney impairment, use with caution and monitor closely.
Hepatic ImpairmentIn patients with severe liver impairment, the maximum daily dose should not exceed 8 mg. Use with caution and monitor liver function.
Maximum Daily DoseThe maximum recommended oral dose for adults is 24 mg per day for chemotherapy-induced nausea and vomiting, but the exact limit depends on the indication and clinical judgment.

Dosage Timeline

🌅 Morning ❌ ☀️ Afternoon ❌ 🌆 Evening ❌ 🌙 Night ❌

🍽️ Food Timing Guide

With food
Can be taken with or without food
Food does not significantly affect absorption.
Grapefruit juice
No specific restriction
No clinically significant interaction established.

⏰ What to Do If You Miss a Dose

📌 Less than half the dosing interval has passed
→ Take the missed dose as soon as you remember.
💡 Continue with the regular schedule.
📌 More than half the dosing interval has passed
→ Skip the missed dose.
💡 Do not double dose to catch up.

⚠️ Side Effects of onsopil 4mg tablet

✅ Common Side Effects

Headache (Common (5-10%))
Usually resolves on its own. Rest and adequate hydration may help. Consult a doctor if it persists or is severe.
Constipation (Common (5-10%))
Increase fibre and fluid intake. Consult a doctor if constipation lasts more than a few days.
Fatigue (Common (5-10%))
Get adequate rest. Avoid driving or operating machinery if you feel tired.
Dizziness (Common (1-5%))
Rise slowly from sitting or lying positions. Avoid driving if dizzy.

🚨 Serious Side Effects

Severe allergic reaction (anaphylaxis) (Rare (<0.1%))
Seek immediate medical attention if you experience rash, itching, swelling of the face, lips, tongue, or throat, or difficulty breathing.
Irregular heartbeat (QT prolongation, torsades de pointes) (Rare (<0.1%))
Seek immediate medical attention if you feel palpitations, faint, or have chest pain.
Serotonin syndrome (Rare (<0.1%))
Seek immediate medical attention if you have agitation, confusion, rapid heart rate, high blood pressure, dilated pupils, muscle twitching, or diarrhoea while taking this medicine with other serotonergic drugs.

⚠️ Rare Side Effects

Transient visual disturbances
Usually resolves within minutes to hours. Consult a doctor if it persists or recurs.
Low blood pressure
Lie down and elevate your legs. Seek medical attention if you feel faint or dizzy.
Hiccups
Usually self-limiting. Consult a doctor if persistent and bothersome.

Consult your doctor if you experience any unusual symptoms.

🔬 Drug Interactions

Drug Severity Effect
Apomorphine Major
Amiodarone Major
Tramadol Moderate
SSRIs (e.g., fluoxetine) Moderate
Rifampicin Moderate
Carbamazepine Moderate
Phenytoin Moderate
Paracetamol Minor
Antacids Minor
Warfarin Minor

🚨 Major Interactions

  • Apomorphine
  • Amiodarone, sotalol, quinidine, and other QT-prolonging drugs

⚡ Moderate Interactions

  • Tramadol
  • SSRIs and SNRIs
  • CYP3A4 inducers (e.g., rifampicin, carbamazepine, phenytoin)

🍷 Alcohol Interaction

Alcohol may increase dizziness, drowsiness, and fatigue while taking this medicine. It is advisable to avoid or limit alcohol consumption during treatment.

🔎 Check Your Other Medicines

Educational tool. Always confirm with your doctor or pharmacist.

🛡️ Safety & Warnings

🚫 Contraindications

["Known hypersensitivity to ondansetron or any component of the formulation","Concomitant use with apomorphine"]

⚠️ Warnings & Precautions

["Use with caution in patients with congenital long QT syndrome or a family history of it.","Correct electrolyte imbalances before starting treatment.","Avoid use in patients with severe liver impairment unless benefits outweigh risks.","May cause dizziness; avoid driving or operating machinery until you know how it affects you.","Do not use to treat nausea and vomiting without a diagnosed cause, as it may mask a serious underlying condition."]

🤱 Lactation Safety

Ondansetron is excreted in small amounts in breast milk. It is generally considered safe for short-term use during breastfeeding, but consult a doctor before use.

💊 Overdose Management

Overdose of this medicine may cause severe nausea, vomiting, dizziness, low blood pressure, and irregular heartbeat. There is no specific antidote. Treatment is supportive and symptomatic. If overdose is suspected, seek immediate medical attention. Contact a poison control centre if available.

⏰ Missed Dose

If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take a double dose to make up for a missed one.

Additional Safety Advice

General Safety

Take this medicine exactly as prescribed by your doctor. Do not increase or decrease the dose on your own. Inform your doctor if you have a history of heart rhythm problems, liver disease, or low potassium or magnesium levels. Avoid driving or operating heavy machinery if you feel dizzy or tired after taking this medicine. Tell your doctor about all other medicines you are taking, especially those that affect heart rhythm or serotonin levels. Do not drink alcohol while taking this medicine, as it may worsen dizziness. If you are pregnant, planning pregnancy, or breastfeeding, consult your doctor before using this medicine. Keep this medicine out of the reach of children.

👴 Special Considerations for Elderly

💡 For Patients Above 65

Elderly patients may be more sensitive to the side effects of this medicine, especially dizziness, constipation, and heart rhythm changes. Use with caution and monitor closely. No specific dose adjustment is usually required, but your doctor may adjust the dose based on your kidney and liver function.

🤰 Pregnancy Planning (TTC)

If you are planning pregnancy or are pregnant, consult your doctor before taking this medicine. It is generally considered acceptable for use in pregnancy when clinically needed, but the benefits and risks should be weighed. Do not start or stop this medicine without medical advice.

🏥 Post-Surgery Considerations

This medicine is often used to prevent and treat nausea and vomiting after surgery. It is usually given before or after the procedure as directed by your anesthesiologist or surgeon. Follow their instructions carefully.

🦷 Dental Procedures

If you are undergoing dental procedures and have a history of nausea with anesthesia, inform your dentist. This medicine may be used to prevent nausea, but it should be prescribed by a doctor.

💚 Lifestyle Tips for Better Results

🏃
Stay well hydrated by drinking plenty of fluids, especially if you are vomiting.
🥗
Eat small, frequent meals rather than large ones to help reduce nausea.
😴
Avoid strong odours and spicy foods that may trigger nausea.
💧
Get adequate rest to help your body recover.
🧘
Practice relaxation techniques such as deep breathing to manage nausea.
🌞
Avoid alcohol, as it can worsen dizziness and dehydration.

🏋️ Exercise Considerations

If you feel dizzy or tired after taking this medicine, avoid strenuous exercise or activities that require balance. Light activity such as walking may be fine if you feel well. Listen to your body and rest when needed.

🥗 Diet Recommendations

Eat small, frequent meals.
Choose bland, easy-to-digest foods like crackers, toast, and rice.
Avoid spicy, greasy, or strongly flavoured foods.
Sip clear fluids throughout the day.
Avoid alcohol and caffeine, which can worsen dehydration.

💼 Impact on Daily Work & Life

This medicine may cause dizziness or fatigue, which can affect your ability to drive or operate machinery. Avoid these activities until you know how the medicine affects you. Most people can continue their normal daily activities, but take precautions if you feel unsteady.

🛑 When to Stop This Medicine

Do not stop taking this medicine without consulting your doctor. If you experience severe side effects or your condition worsens, contact your doctor immediately. Usually, this medicine is taken for a short period, and your doctor will advise you when to stop.

📅 Long-Term Use Effects

Long-term use of this medicine is not common, as it is usually prescribed for short periods. Prolonged use may lead to constipation, headache, and fatigue. There is limited information on the effects of long-term use. Regular monitoring of liver function and heart rhythm may be advised in patients with underlying conditions. Consult your doctor if you need to take this medicine for more than a few days.

🌿 Non-Medicine Approaches

These can complement medicine but do not replace prescribed treatment.

Ginger

Some people find ginger helpful for mild nausea, but evidence is limited.

Evidence: Limited
Acupuncture

Acupuncture at the P6 point may help reduce nausea and vomiting in some patients.

Evidence: Moderate
Relaxation techniques

Deep breathing and guided imagery may help manage nausea.

Evidence: Limited

💉 Vaccination Considerations

💉 If You're Getting Vaccinated

There are no known interactions between this medicine and vaccines. You can receive vaccinations as scheduled, but inform your healthcare provider if you are taking this medicine.

📦 Storage Guide

✅ DO

Store at room temperature (15-30°C)

❌ DON'T

Do not refrigerate unless specified

✅ DO

Keep in original container

❌ DON'T

Do not transfer to unmarked containers

✅ DO

Keep away from direct sunlight

❌ DON'T

Do not store in bathroom cabinet

✈️ Traveling with This Medicine

When travelling, carry this medicine in its original packaging with a copy of your prescription. Store it at room temperature and protect it from extreme heat or moisture. If you are crossing time zones, adjust your dosing schedule only after consulting your doctor. Keep it in your hand luggage to avoid loss or temperature extremes. Check customs regulations for carrying prescription medicines in your destination country.

💰 Cost Analysis & Savings

👥 Real Patient Stories

Educational, anonymized scenarios. Individual results may vary.

👤 A 52-year-old woman undergoing chemotherapy for breast cancer
She was prescribed this medicine before each chemotherapy session. She found that taking it 30 minutes before treatment significantly reduced her nausea and vomiting. She also learned to take it with a light snack to avoid stomach discomfort. She reported mild constipation, which was managed by increasing fibre and fluids in her diet.
💡 Lesson: Taking this medicine exactly as prescribed before chemotherapy can greatly improve comfort and quality of life during treatment.
👤 A 35-year-old man recovering from abdominal surgery
He experienced severe nausea after surgery and was given this medicine. Within an hour, his nausea subsided and he was able to rest comfortably. He was advised to avoid driving for 24 hours due to mild dizziness. He was also reminded not to take more than the prescribed dose.
💡 Lesson: This medicine is effective for post-operative nausea, but it can cause dizziness, so it is important to avoid driving until you know how it affects you.

💬 Questions Patients Often Ask

Q: How long does it take to work?

A: This medicine usually starts to reduce nausea within 30 to 60 minutes after oral administration.

Q: Can I take it with food?

A: Yes, you can take this medicine with or without food. Taking it with a small snack may help reduce stomach upset.

Q: Is it safe during pregnancy?

A: This medicine is generally considered acceptable for use in pregnancy when clinically needed, but you should consult your doctor to weigh the benefits and risks.

Q: What should I do if I miss a dose?

A: If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not double dose.

🤔 Common Patient Concerns

💭 These are the concerns patients most commonly raise

  • Can I take this medicine long-term?
  • Will it affect my kidney function?
  • Can I drive after taking this medicine?
  • Does it interact with my blood pressure medicine?
  • What if I miss a dose?
  • Can I drink alcohol while taking this?

🔄 Substitutes for onsopil 4mg tablet

View All

Alternative brands with exact same active ingredient:

Medical Note: Always consult your doctor before switching medications.

🛑 Myths vs. Facts

  • Myth: This medicine can be taken for any type of stomach upset.
    Fact: This medicine is specifically for nausea and vomiting caused by chemotherapy, radiotherapy, or surgery. It is not a general stomach remedy.
  • Myth: This medicine is safe to take without a prescription.
    Fact: This medicine is a prescription drug and should only be taken under medical supervision.
  • Myth: Taking this medicine with alcohol is safe.
    Fact: Alcohol may increase dizziness and drowsiness. It is best to avoid alcohol while taking this medicine.

🔄 Alternative Options

Generic Alternatives

  • Ondansetron 4 mg tablet

Brand Alternatives

  • Alset 4mg Tablet

📊 Comparison with Similar Medicines

[{"medicine":"Ondansetron","class":"5-HT3 receptor antagonist","common_use":"Chemotherapy, radiotherapy, post-operative nausea","half_life":"3-6 hours"},{"medicine":"Granisetron","class":"5-HT3 receptor antagonist","common_use":"Chemotherapy, radiotherapy, post-operative nausea","half_life":"3-6 hours"},{"medicine":"Palonosetron","class":"5-HT3 receptor antagonist","common_use":"Chemotherapy-induced nausea and vomiting","half_life":"40 hours"}]

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