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O2 Tablet is a combination medicine containing ofloxacin (an antibiotic) and ornidazole (an antiprotozoal/antibacterial). It is used to treat bacterial and parasitic infections, such as diarrhea, dysentery, and other intestinal infections. It works by killing the infection-causing organisms and preventing their growth. Take it as prescribed and complete the full course to ensure effective treatment. Avoid alcohol during treatment and for a few days after stopping the medicine, as it may cause unpleasant effects. Common side effects include nausea, dizziness, stomach pain, and headache. Use O2 Tablet with caution in people with liver problems, neurological disorders, or a history of tendon problems.Written By Dr. Swati Mishra, BDS,
Reviewed By Dr. Sachin Gupta, MD Pharmacology, MBBS,
Last updated on 13 Apr 2026 | 12:53 PM (IST)



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General Information








Product introduction
O2 Tablet is best taken with food. Take it at a fixed time to ensure better efficacy. Do not take more than the recommended dose, as it may have harmful effects on your body. If you miss a dose, take it as soon as you remember. The treatment must be completed even if you feel better to ensure a complete recovery.
This medicine may lead to some side effects such as nausea, vomiting, dizziness, and headache. To overcome any such side effects, it is advised to eat a healthy, balanced diet and drink plenty of fluids. If any of the side effects get aggravated, consult your doctor immediately. If you experience any allergic reaction (rashes, itching, swelling, shortness of breath, etc.), you must seek immediate medical help.
Before taking this medicine, tell your doctor if you have any liver or kidney problems. Also, inform your doctor about all other medicines you are taking for any health condition. Pregnant or breastfeeding women should consult their doctor before using this medicine. Avoid drinking alcohol during treatment, as it may increase dizziness. This medicine usually does not affect the ability to drive, but do not drive or operate machinery if it makes you sleepy or dizzy. If you are allergic to this medicine, avoid using it. Adequate rest during the course of treatment may help the medicine work more effectively.
Uses of O2 Tablet
- Treatment of Bacterial & parasitic infections
Benefits of O2 Tablet
O2 Tablet is a medicine used to treat infections caused by bacteria and parasites. It works by killing harmful microorganisms and stopping their growth, helping the body clear the infection. This helps relieve symptoms such as diarrhea, abdominal pain, cramps, and discomfort. As the infection resolves, it supports recovery and helps restore normal digestive function. Complete the full course as prescribed to help prevent recurrence and to reduce the risk of drug resistance.
Side effects of O2 Tablet
- Dizziness
- Headache
- Insomnia (difficulty in sleeping)
- Vomiting
- Itching
- Vaginal inflammation
- Diarrhea
- Nausea
How to use O2 Tablet
How O2 Tablet works
Dosage
The dose of O2 Tablet depends on your age, the type and severity of infection, and your overall health. It is usually taken two times a day, depending on the infection being treated. However, your doctor will decide the right dose and duration of treatment for you.
Try to take the medicine at evenly spaced times each day. Do not take more than the prescribed dose and do not use it for longer than recommended. Complete the full course of treatment even if you start to feel better, as stopping the medicine too early may allow the infection to return or become harder to treat.
Missed Dose
If you miss a dose of O2 Tablet, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular schedule. Do not double the dose.
Overdose
An overdose of O2 Tablet may cause confusion, dizziness, impairment of consciousness, and convulsive seizures, as well as gastrointestinal reactions.
If overdose is suspected, please contact your doctor. The doctor may consider standard measures to remove any unabsorbed drug.
All substitutes for O2 Tablet
Ofron-OZ Tablet
Oflotas-OZ Tablet
Olox-OZ Tablet
Oflox OZ Tablet
Ornof Tablet
Quick tips
- Complete the full course of O2 Tablet exactly as advised, even if you start feeling better.
- Take O2 Tablet with water and maintain adequate hydration, especially if diarrhea is present.
- Avoid alcohol while taking O2 Tablet and for some time after completing the course, as it may cause severe reactions and worsen side effects.
- Avoid taking antacids or mineral supplements close to the dose of O2 Tablet unless advised by your doctor, as they may reduce its absorption.
- Seek medical advice if you develop severe diarrhea, bloody stools, or high fever.
- Stop taking O2 Tablet and seek medical help if you develop rash, swelling, breathing difficulty, or signs of allergic reaction.
- Inform your doctor if you have kidney disease, seizures, or heart rhythm problems before taking O2 Tablet.
- Report symptoms such as tendon pain, numbness, tingling, palpitations, or severe dizziness promptly.
- Consult your doctor if symptoms do not improve within 2–3 days of starting O2 Tablet.
- Inform your doctor if you are pregnant, planning pregnancy, or breastfeeding before taking O2 Tablet.
Safety advice

Alcohol

Pregnancy

Breast feeding

Driving

Kidney

Liver
Frequently asked questions
Fact Box
Habit Forming
Therapeutic Class
References





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Marketer details
Address: Plot No. D2 Medley House,Street No. 6 M.I.D.C. Area, Andheri (East), Mumbai-400 093, INDIA
Vendor Details
A licensed vendor partner from your nearest location will deliver O2 Tablet. Once the pharmacy accepts your order, the details of the pharmacy will be shared with you. Acceptance of your order is based on the validity of your doctor's ℞ and the availability of this medicine.
In case of any issues, contact us
Email ID: [email protected]Phone Number: 0124-4166666
Address: 5th Floor Tower - B of the Presidency Building, 46/4 Mehrauli Gurgaon Road, Sector 14, Gurugram, Haryana-122001, India
Lab tests offered by us
- CBC (Complete Blood Count)
- FBS (Fasting Blood Sugar)
- Thyroid Profile Total (T3, T4 & TSH)
- HbA1c (Glycosylated Hemoglobin)
- PPBS (Postprandial Blood Sugar)
- Lipid Profile
- Vitamin D (25-Hydroxy)
- Urine R/M (Urine Routine & Microscopy)
- Coronavirus Covid -19 test- RT PCR
- LFT (Liver Function Test)
- KFT (Kidney Function Test)
- TSH (Thyroid Stimulating Hormone) Ultrasensitive
- ESR (Erythrocyte Sedimentation Rate)
- Uric Acid, Serum
- Vitamin B12
- CRP (C-Reactive Protein), Quantitative
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- Diabetes Screening (HbA1C & Fasting Sugar)
- KFT with Electrolytes (Kidney Function Test with Electrolytes)
- Cholesterol - Total
- Hb (Hemoglobin)
- Complete Hemogram (CBC & ESR)





