Dolasetron

Dolasetron is a prescription medication used to prevent nausea and vomiting caused by chemotherapy. Dolasetron is also used to prevent or treat nausea and vomiting after surgery.

Dolasetron belongs to a group of drugs called serotonin 5-HT3 antagonists, which block serotonin from causing nausea and vomiting.

This medication comes in tablet and injectable forms. The tablet is taken by mouth within one hour before chemotherapy. The injectable form is given by IV (into the vein) during surgery.

Common side effects of dolasetron include headache, diarrhea, tiredness, and dizziness.

Dolasetron is a prescription medicine used to prevent nausea and vomiting caused by chemotherapy. Dolasetron is also used to prevent or treat nausea and vomiting after surgery.

This medication may be prescribed for other uses. Ask your doctor or pharmacist for more information.

Dolasetron Tablets

The recommended oral (by mouth) dolasetron dosage for the prevention of nausea and vomiting caused by chemotherapy is 100 mg. Dolasetron dosing for children 2 to 16 years of age is based on the child's weight.

The dose should be taken within one hour before chemotherapy.

Dolasetron Injection

The recommended intravenous dosage of dolasetron injection is 12.5 mg given during surgery. Dolasetron injection dosing for children 2 to 16 years of age is based on the child's weight.

Dolasetron injection solution may be mixed into apple or apple-grape juice for children to take by mouth within 2 hours before surgery. When dolasetron injection is taken by mouth, the recommended dosage in children 2 to 16 years of age is 1.2 mg/kg.

Do not take dolasetron if you are allergic to any of its ingredients.

Dolasetron may cause serious cardiac arrhythmias (abnormal heart rhythm) such as QT prolongation, a dangerous irregular heart rhythm. Tell your doctor right away if you experience any of the following symptoms:

• change in heart rate
• lightheadedness
• fainting episodes

Your chances of developing QT prolongation and other serious heart arrhythmias are higher if you:

• have had abnormal heart rhythms or someone in your family has had abnormal heart rhythms
• have had other heart problems including heart attack
• take certain medications that increase risk of abnormal heart rhythm. (See "Drug Interactions" section.)
• take diuretics ("water pills"). See "Drug Interactions" section.
• have low blood levels of magnesium or potassium (can be caused by certain chemotherapy medications)
• are elderly or have kidney disease

Dolasetron injection is not to be given to adults or pediatric patients for the prevention of nausea and vomiting associated with chemotherapy.

Dolasetron may cause serious side effects. See "Drug Precautions" section.

Common side effects of this medication include:

• headache
• diarrhea
• tiredness
• heartburn
• dizziness
• chills
• indigestion
• less frequent urination

Tell your doctor if any side effect is bothersome or doesn't go away. Especially tell your doctor right away if you experience any of these symptoms, which may be symptoms of serious side effects:

• dizziness
• fainting
• irregular heartbeat (fast or slow)
• chest pain
• hives, rash
• itching
• difficulty swallowing
• difficulty breathing

This is not a complete list of dolasetron side effects. Ask your doctor or pharmacist for more information.

Tell your doctor about all the medicines you take including prescription and non-prescription medicines, vitamins, and herbal supplements.

Because dolasetron can increase the risk of QT prolongation (a dangerous irregular heart rhythm) tell your doctor if you take any of the following medications:

• medications for arrhythmia such as flecainide (Tambocor), quinidine (Quinidex, Quinaglute),
• verapamil (Calan, Isoptin, Verelan, in Tarka)
• diuretics ("water pills")

Some medications increase the risk of dolasetron side effects by increasing the level of dolasetron in the blood. Such medications include:

• atenolol (Tenormin)
• cimetidine (Tagamet)

Rifampin (Rifadin) may decrease blood levels of dolasetron.

Also, be sure to tell your doctor if you have ever received chemotherapy medications.

This is not a complete list of dolasetron drug interactions. Ask your doctor or pharmacist for more information.

Tell your doctor if you are pregnant or plan to become pregnant.

The FDA categorizes medications based on safety for use during pregnancy. Five categories - A, B, C, D, and X, are used to classify the possible risks to an unborn baby when a medication is taken during pregnancy.

This medication falls into category B. There are no well-done studies that have been done in humans with dolasetron. In animal studies, pregnant animals were given this medication, and the babies did not show any medical issues related to this medication.

Tell your doctor if you are breastfeeding or plan to breastfeed. It is not known if dolasetron is excreted in human breast milk or if it will harm your nursing baby.