Oseltamivir phosphate (Fluvir) 75 mg


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Oseltamivir Phosphate (Fluvir) 75mg capsule is containing active ingredient Oseltamivir, is a FDA approved anti-viral prescription medicine used to treat acute uncomplicated influenza A and influenza B viruses that cause the flu in adults and pediatric patients.

Oseltamivir is also useful for influenza prophylaxis if there is flu outbreak or within 48 hours of contact with an infected individual in adults and children greater than one year of age. Oseltamivir is not a substitute for flu vaccine. If you receive the flu vaccine every year, continue to do.

Moreover, the US FDA has disapproved of this medicine’s use to treat patients with mild, moderate, and severe COVID-19. Do not use this medicine to treat COVID-19 unless directed by the doctor. 

Oseltamivir phosphate Fluvir 75 mg

What does Oseltamivir phosphate (Fluvir) 75mg contain?

Oseltamivir phosphate (Fluvir) 75mg capsule contains its active ingredient oseltamivir, which is an anti-viral medicine that belongs to a class of drugs called neuraminidase inhibitors. 

Black iron oxide (Fe3O4), gelatin, red iron oxide (Fe2O3), titanium dioxide (TiO2), and yellow iron oxide (Fe2H6O) are all included in the 75 mg capsule shell. Each capsule is printed with blue ink that contains the colorant FD&C Blue No.2.

How does Oseltamivir phosphate (Fluvir) 75mg work?

Oseltamivir phosphate (Fluvir) 75mg capsule and its active ingredient oseltamivir, is an anti-viral medicine which acts as a neuraminidase inhibitor with potent and selective competitive inhibition of the influenza virus neuraminidase, an enzyme necessary for viral replication. It works by stopping the spread of the flu virus in the body. Oseltamivir also reduces the duration of shedding and the viral titer and can shorten the length of symptoms by 1 to 3 days. 

Who cannot take Oseltamivir phosphate (Fluvir) 75mg?

Before taking this drug, inform your doctor if you have any of the following conditions.  Oseltamivir is not suitable for everyone. Patients under treatment for the following conditions, or any ongoing managed condition, should consult their doctor prior to taking this medication 

  • You should not use this medicine if you are allergic to oseltamivir, any other medications, or any of the ingredients in oseltamivir capsules . 
  • HIV/AIDS, or other conditions that can weaken the immune system
  • A medical history of heart, lung and kidney disease or kidney transplant or bone marrow transplant
  • Oseltamivir should not be used in patients with influenza illnesses due to strains confirmed as resistant to oseltamivir.
  • In addition, it should not be used for diseases caused by organisms other than influenza viruses.

How should you take Oseltamivir phosphate (Fluvir) 75mg?

Take this drug exactly as prescribed by your doctor with food (to reduce gastrointestinal upset) or without food. You may view Additional Information tab for recommended doses. Take this medication as soon as flu symptoms appear or as soon as possible after you have been exposed to the flu. Oseltamivir works best if you start taking it within 2 days either of these events. Do not take this medicine in larger or smaller amounts or for longer than recommended. Do not skip any doses and finish the full course of treatment.

  • When oseltamivir is used to treat flu symptoms, it is usually taken two times a day (morning and evening) for 5 days. 
  • When oseltamivir is used to prevent flu, it is usually taken once a day for at least 10 days, or for up to 6 weeks during a community flu outbreak. 

Periodically reassess the appropriateness of continued use of the daily regimen. Dosage recommendations may vary among individual products and between countries (refer to detailed product guideline).

What if you miss a dose?

If you miss a dose of this medicine, 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 dosing schedule. Do not double the doses. 

What if you take too much?

Reports of overdoses or toxicity with oseltamivir have been received from clinical trials and during post-marketing experience. In the majority of cases reporting overdose, no adverse reactions were reported. Adverse reactions reported following overdose were similar in nature to those observed with therapeutic doses of oseltamivir.

If you take too much of the drug, seek medical help immediately.

What are the side effects of Oseltamivir phosphate (Fluvir) 75mg?

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. The most frequently reported adverse effect by patient taking oseltamivir Includes:

  • Nausea (up to 10%)
  • Vomiting (2 to 15%) – most frequently reported side effect in children (16% of children aged 1-12 years) 
  • Abdominal pain
  • Diarrhea
  • Headache 
  • Insomnia
  • Vertigo 

Other side effects occurring less than 1% of the time include conjunctivitis, epistaxis, allergy, arrhythmia, GI bleeding, erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis, confusion, seizures, and neuropsychiatric events.

This is not a complete list of possible adverse effects; others may arise. For medical advice on side effects, contact your doctor.

Get emergency medical help if you have signs of an allergic reaction (hives, difficulty of breathing, swelling in your face of throat) to oseltamivir, or a severe skin reaction (fever, sore throat, burning in your eyes, skin pain, red or purple skin rash that spreads and causes blistering and peeling).   

What other precautions should be taken?


Oseltamivir is not indicated to treat flu in children younger than 2 weeks of age nor to prevent flu in children younger than 1 year of age. Safety and efficacy have not been established.


Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of oseltamivir in the elderly.


This drug is a categorized as FDA Pregnancy class C. Use with caution if benefits outweigh risks. Animal studies show risk and human studies not available or neither animal nor human studies done.


There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding. 

Drug-Disease interactions

The presence of other medical problems may affect the use of this medicine. Make sure you tell your doctor if you have any other medical problems, especially:

  • Heart disease or
  • Illnesses caused by viruses other than influenza Type A or B or
  • Liver disease, severe or
  • Lung disease or
  • Serious medical problems that may need admission to a hospital or
  • Weakened immune system—Safety of this medicine for people with these conditions is not established.
  • Kidney disease—Use with caution. The effects may be increased because of slower removal of the medicine from the body.

Drug-Drug interactions

Tell your doctor what prescription and nonprescription medications, vitamins, nutritional supplements and herbal products you are taking or plan to take. Be sure to mention any of the following medications especially that affect the immune system such as: Azathiprine, cyslosporine, cancer chemotherapy medications, methotrexate, sirolimus, and oral steroids such as dexamethasone and prednisone. Your doctor may need the change the doses of your medications or monitor you carefully for side effects. 


There are no direct interactions between alcohol and the flu shot or flu medications. This means that alcohol doesn’t affect how well the shot or medications work. Always drink in moderation and drink responsibly. 


Oseltamivir Phosphate (Fluvir) 75mg is not expected to affect your ability to drive a car or operate machinery. If you experience a decrease alertness, and affect your vision or make you feel sleepy and dizzy while taking this medicine. Do not drive and immediately consult your doctor. 

Diet and Lifestyle

Apart from vaccination and antiviral treatment, the public health management includes personal protective measures like:

  • Regular hand washing with proper drying of the hands
  • Good respiratory hygiene – covering mouth and nose when coughing or sneezing, using tissues and disposing of them correctly
  • Early self-isolation of those feeling unwell, feverish and having other symptoms of influenza
  • Avoiding close contact with sick people
  • Avoiding touching one’s eyes, nose or mouth

Quick Tips

  • Oseltamivir phosphate (Fluvir) 75mg will not stop you from giving the flu to others. You should wash your hands frequently, and avoid practices such as sharing cups and utensils that can spread the virus to others. 
  • The most effective way to prevent the disease is vaccination. Oseltamivir is not a substitute for flu vaccine. If you receive the flu vaccine every year, continue to do so. 
  • Do not let anyone else take your medication. Your prescription is probably not refillable. If you still have symptoms of the flu after you finish taking oseltamivir, call your doctor

How should you store Oseltamivir phosphate (Fluvir) 75mg?

Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing. Keep out of the reach of children. Do not keep outdated medicine or medicine no longer needed. 

What company produces Oseltamivir phosphate (Fluvir) 75mg?

Hetero HealthcareChairman: Dr. B. Partha Saradhi Reddy
Founder: Uttambhai Nathalal Mehta
Founded: 1993
Headquarters: Hyderabad
Number of employees: Over 22,000
Subsidiaries: Camber Pharmaceuticals Inc.
Website: https://www.heterohealthcare.com


Additional Information


The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. Recommended doses are as follows. If your dose is different, do not change it unless your doctor tells you to do so.

Treatment of influenza A and B:
Adult: 75 mg twice a day for 5 days. Initiate within 2 days of onset of symptoms.
Children: Dose will vary depending on age and weight

Prevention of influenza A and B:
Adult: 75 mg once daily for at least 10 days. Initiate within 2 days of exposure.
For community outbreak: May continue dosing for up to 6 weeks
Children: Dose will vary depending on age and weight

Side Effects

Common side effects:
-Nausea (up to 10%)
-Vomiting (2 to 15%) – most frequently reported side effect in children (16% of children aged 1-12 years) 
-Abdominal pain


This medicine is not recommended for use in patients with a known allergy to Oseltamivir or any other inactive ingredients present along with the formulation.

Pack Size

30 Pills, 60 Pills, 90 Pills


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