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Drugs reference index «ondansetron»

ondansetron


ondansetron

Generic Name: ondansetron (oral) (on DAN se tron)Brand Names: Zofran, Zofran ODT

What is ondansetron?

Ondansetron blocks the actions of chemicals in the body that can trigger nausea and vomiting.

Ondansetron is used to prevent nausea and vomiting that may be caused by surgery or by medicine to treat cancer (chemotherapy or radiation).

Ondansetron may be used for other purposes not listed in this medication guide.

What is the most important information I should know about ondansetron?

You should not use this medication if you are allergic to ondansetron or to similar medicines such as dolasetron (Anzemet), granisetron (Kytril), or palonosetron (Aloxi).

Before taking ondansetron, tell your doctor if you have liver disease, or a personal or family history of Long QT syndrome.

Ondansetron orally disintegrating tablets may contain phenylalanine. Tell your doctor if you have phenylketonuria (PKU).

The serious side effects of this medication include blurred vision or temporary vision loss (lasting from only a few minutes to several hours), slow heart rate, trouble breathing, anxiety, agitation, shivering, feeling like you might pass out, and urinating less than usual or not at all. Stop taking ondansetron and call your doctor at once if you have any of these side effects. Ondansetron can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert.

What should I discuss with my health care provider before taking ondansetron?

You should not use this medication if you are allergic to ondansetron, to similar medicines such as dolasetron (Anzemet), granisetron (Kytril), or palonosetron (Aloxi).

If you have any of these other conditions, you may need a dose adjustment or special tests to safely take ondansetron:

  • liver disease; or
  • a personal or family history of Long QT syndrome.

FDA pregnancy category B. This medication is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment. It is not known whether ondansetron passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

Ondansetron orally disintegrating tablets may contain phenylalanine. Tell your doctor if you have phenylketonuria (PKU).

How should I take ondansetron?

Take this medication exactly as it was prescribed for you. Do not take the medication in larger amounts, or take it for longer than recommended by your doctor. Follow the directions on your prescription label.

Ondansetron can be taken with or without food.

Take the ondansetron regular tablet with a full glass of water.

To take ondansetron orally disintegrating tablet (Zofran ODT):

  • Keep the tablet in its blister pack until you are ready to take the medicine. Open the package and peel back the foil from the tablet blister. Do not push a tablet through the foil or you may damage the tablet.

  • Using dry hands, remove the tablet and place it in your mouth. It will begin to dissolve right away.

  • Do not swallow the tablet whole. Allow it to dissolve in your mouth without chewing.

  • Swallow several times as the tablet dissolves. If desired, you may drink liquid to help swallow the dissolved tablet.

Measure the liquid form of ondansetron with a special dose-measuring spoon or cup, not a regular table spoon. If you do not have a dose-measuring device, ask your pharmacist for one.

Store ondansetron at room temperature away from moisture and heat.

See also: Ondansetron dosage in more detail

What happens if I miss a dose?

Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at your next regularly scheduled time. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention if you think you have received too much of this medicine.

Overdose symptoms may include sudden loss of vision, severe constipation, feeling light-headed, or fainting.

What should I avoid while taking ondansetron?

Ondansetron can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert.

Ondansetron side effects

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have a serious side effect such as:
  • blurred vision or temporary vision loss (lasting from only a few minutes to several hours);

  • slow heart rate, trouble breathing;

  • anxiety, agitation, shivering;

  • feeling like you might pass out; or

  • urinating less than usual or not at all.

Less serious side effects may include:

  • diarrhea or constipation;

  • weakness or tired feeling;

  • fever;

  • headache; or

  • dizziness, drowsiness.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Ondansetron Dosing Information

Usual Adult Dose for Nausea/Vomiting -- Chemotherapy Induced:

Initial: 0.15 mg/kg IV given 30 minutes before the start of emetogenic therapy, then repeat the dose at 4 hour intervals for 2 additional doses. A continuous IV dose option consists of 8 mg followed by 1 mg/hr for the next 24 hours.Alternative therapies:With highly emetogenic chemotherapy, give a onetime IV dose of 32 mg, 30 minutes before the start of single-day therapy; Infuse over 15 minutes. Alternatively, give a single 24 mg orally 30 minutes before therapy.With moderate emetogenic chemotherapy, give 8 mg orally 30 minutes before the start of therapy, then 8 mg given 8 hours after the first dose. Thereafter, give 8 mg every 12 hours for 1 to 2 days after emetogenic therapy is complete.

Usual Adult Dose for Nausea/Vomiting:

Initial: 0.15 mg/kg IV given 30 minutes before the start of emetogenic therapy, then repeat the dose at 4 hour intervals for 2 additional doses. A continuous IV dose option consists of 8 mg followed by 1 mg/hr for the next 24 hours.Alternative therapies:With highly emetogenic chemotherapy, give a onetime IV dose of 32 mg, 30 minutes before the start of single-day therapy; Infuse over 15 minutes. Alternatively, give a single 24 mg orally 30 minutes before therapy.With moderate emetogenic chemotherapy, give 8 mg orally 30 minutes before the start of therapy, then 8 mg given 8 hours after the first dose. Thereafter, give 8 mg every 12 hours for 1 to 2 days after emetogenic therapy is complete.

Usual Adult Dose for Nausea/Vomiting -- Postoperative:

4 mg IV (undiluted) over 2 to 5 minutes, or IM, immediately before induction of anesthesia or postoperatively if nausea or vomiting occurs immediately after surgery. Alternatively, 16 mg orally 1 hour before induction of anesthesia

Usual Adult Dose for Nausea/Vomiting--Radiation Induced:

8 mg orally every 8 hours, give the first dose 1 to 2 hours prior to radiotherapy.

Usual Adult Dose for Pruritus:

Study (n=150) - Induced by Intrathecal Fentanyl8 mg IV before spinal anesthesia.

Usual Adult Dose for Alcohol Dependence:

Study (n=321) - Early onset alcoholism4 mcg/kg two times daily.

Usual Adult Dose for Postanesthetic Shivering:

Study (n=82)8 mg IV, 3 to 5 minutes before the induction of anesthesia.

Usual Pediatric Dose for Nausea/Vomiting -- Postoperative:

Child 1 month to 12 years:40 kg or less: 0.1 mg/kg single dose IV, administered over 2 to 5 minutes, immediately prior to or following anesthesia induction, or postoperatively if nausea and/or vomiting present shortly after surgery.40 kg or more: 4 mg single dose IV, administered over 2 to 5 minutes, immediately prior to or following anesthesia induction, or postoperatively if nausea and/or vomiting present shortly after surgery.

Usual Pediatric Dose for Nausea/Vomiting -- Chemotherapy Induced:

Child 6 months to 18 years: 0.15 mg/kg as an IV infusion (over 15 minutes) administered 30 minutes before the start of emetogenic therapy, then at 4 and 8 hours after the first dose, respectively.4 to 11 years: 4 mg orally given 30 minutes before the start of emetogenic therapy, then 4 mg orally 4 and 8 hours after the first dose. Thereafter, 4 mg orally every 8 hours for 1 to 2 days after emetogenic therapy is complete.11 years or older:: 8 mg orally 3 times daily, or 24 mg orally once daily.

Usual Pediatric Dose for Gastroenteritis:

Study (n=145) - Control of emesis during the ED phase of oral rehydration:6 months to 12 months: 1.6 mg orally every 8 hours1 year to 3 years: 3.2 mg orally every 8 hours4 years or older: 4 mg orally every 8 hoursDosage was administered 15 minutes before the start of oral rehydration.

What other drugs will affect ondansetron?

Tell your doctor about all other medications you use, especially:

  • phenytoin (Dilantin), phenobarbital (Luminal);

  • carbamazepine (Carbatrol, Tegretol);

  • tramadol (Ultram); or

  • rifampin (Rifadin, Rimactane, Rifater).

This list is not complete and there may be other drugs that can interact with ondansetron. Tell your doctor about all your prescription and over-the-counter medications, vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start a new medication without telling your doctor.

Where can I get more information?

  • Your pharmacist can provide more information about ondansetron.
  • Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
  • Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
Copyright 1996-2006 Cerner Multum, Inc. Version: 7.01. Revision Date: 01/11/2010 11:42:50 AM.
  • ondansetron Oral, Injection, Intravenous Advanced Consumer (Micromedex) - Includes Dosage Information
  • Ondansetron MedFacts Consumer Leaflet (Wolters Kluwer)
  • Ondansetron Prescribing Information (FDA)
  • Zofran Prescribing Information (FDA)
  • Zofran Detailed Consumer Information (PDR)
  • Zofran Consumer Overview
  • Zofran ODT Prescribing Information (FDA)
  • Zofran ODT Orally Disintegrating Tablets MedFacts Consumer Leaflet (Wolters Kluwer)