Type of medicine: antiviral
Generic and brand names: oseltamivir phosphate, oral; Tamiflu
This medicine is taken by mouth to prevent or treat infections caused by influenza viruses. It does not treat bacterial or other types of infections.
Before you take this medicine, tell your healthcare provider if you have ever had:
Tell your provider if you have gotten the nasal-spray flu vaccine within the past 2 weeks. Do not get the nasal spray flu vaccine for at least 48 hours after you start taking this medicine.
Females of childbearing age: Tell your healthcare provider if you are pregnant or plan to become pregnant. It is not known whether this medicine will harm an unborn baby. Do not breast-feed while taking this medicine without your healthcare provider's approval.
This medicine is most effective if you take it within 2 days after your flu symptoms start.
This medicine comes in capsules or a liquid that is taken by mouth. If you have the liquid, shake the medicine before each use. The pharmacist will give you a marked measuring device. It is important that you use this measuring device. Follow your healthcare provider's instructions on which dose to take. Read the label on the medicine bottle carefully and call your healthcare provider or pharmacist if the directions do not match the measuring device amounts or if you have any questions.
You may take this medicine with or without food. Taking it with meals may lessen the chance the drug will upset your stomach.
Be sure to take this medicine for the full treatment time, even if you feel better after the first few doses. Your infection may not clear up completely if you stop the medicine too soon.
Check the label on the medicine for directions about your specific dose. If you are taking this medicine to prevent the flu, take as directed by your healthcare provider.
If you miss a dose, take it as soon as you remember. However, if you are scheduled to take your next dose in 2 hours or less, skip the missed dose and take 1 dose at the usual time. Do not take double doses. If you miss several doses, ask your healthcare provider what to do.
If you or anyone else has intentionally taken too much of this medicine, call 911 or go to the emergency room right away. If you pass out, have seizures, weakness or confusion, or have trouble breathing, call 911. If you think that you or anyone else may have taken too much of this medicine, call the poison control center. Do this even if there are no signs of discomfort or poisoning. The poison control center number is 800-222-1222.
Symptoms of an acute overdose may include: nausea vomiting.
People with the flu, particularly children and teens, who take this medicine may have behavior changes. Contact your provider right away if you notice changes in thoughts or behavior, such as:
This medicine is not a substitute for a flu shot. You should continue to get a flu shot every year.
If you need emergency care, surgery, or dental work, tell the healthcare provider or dentist you are taking this medicine.
Along with its needed effects, your medicine may cause some unwanted side effects. Some side effects may be very serious. Some side effects may go away as your body adjusts to the medicine. Tell your healthcare provider if you have any side effects that continue or get worse.
Life-threatening (Report these to your healthcare provider right away. If you cannot reach your healthcare provider right away, get emergency medical care or call 911 for help): Allergic reaction (hives; itching; rash; trouble breathing; tightness in your chest; swelling of your lips, tongue, and throat).
Serious (contact your health care provider right away): Confusion; hallucinations; depression; suicidal thoughts; severe skin rash or redness, peeling, or blisters; irregular heartbeat; yellowing of your eyes or skin; seizures.
Other: Diarrhea, nausea, vomiting, headache, tiredness, trouble sleeping, cough, runny or stuffy nose, dizziness.
When you take this medicine with other medicines, it can change the way this or any of the other medicines work. Nonprescription medicines, vitamins, natural remedies, and certain foods may also interact. Using these products together might cause harmful side effects. Talk to your healthcare provider if you are taking:
Do not get the nasal spray flu vaccine for at least 48 hours after you start taking this medicine.
If you are not sure if your medicines might interact, ask your pharmacist or healthcare provider. Keep a list of all your medicines with you. List all the prescription medicines, nonprescription medicines, supplements, natural remedies, and vitamins that you take. Be sure that you tell all healthcare providers who treat you about all the products you are taking.
Store the capsules at room temperature. The liquid may be stored in the refrigerator or at room temperature. Always follow the directions on the medicine bottle for storage. Ask your pharmacist if you have any questions.
Keep the container tightly closed. Protect it from heat, high humidity, and bright light. Do not let the medicine freeze.
This advisory includes selected information only and may not include all side effects of this medicine or interactions with other medicines. Ask your healthcare provider or pharmacist for more information or if you have any questions.
Ask your pharmacist for the best way to dispose of outdated medicine or medicine you have not used. Do not throw medicine in the trash.
Keep all medicines out of the reach of children.
Do not share medicines with other people.
