{"id":8084,"date":"2025-08-02T07:00:02","date_gmt":"2025-08-02T07:00:02","guid":{"rendered":"https:\/\/healthmedicinet.com\/review\/hmn-common-and-serious-side-effects-of-ondansetron-zofran-in-2025\/"},"modified":"2025-08-02T07:00:02","modified_gmt":"2025-08-02T07:00:02","slug":"hmn-common-and-serious-side-effects-of-ondansetron-zofran-in-2025","status":"publish","type":"post","link":"https:\/\/healthmedicinet.com\/review\/hmn-common-and-serious-side-effects-of-ondansetron-zofran-in-2025\/","title":{"rendered":"HMN: Common and serious side effects of ondansetron (Zofran) in 2025"},"content":{"rendered":"<p>\n<br \/>Do you know:  Common and serious side effects of ondansetron (Zofran) in 2025<\/p>\n<div id=\"main-content\">\n<div id=\"post-intro\">\n<div id=\"takeaways\">\n<h2>Key takeaways<\/h2>\n<ul>\n<li>\n<p><span style=\"font-weight: 400;\">Ondansetron is a generic prescription drug used to prevent nausea and vomiting from chemotherapy, radiation, and surgery.<\/span><\/p>\n<\/li>\n<li>\n<p><span style=\"font-weight: 400;\">Common side effects include headache, drowsiness, constipation, tiredness, weakness, and chills.<\/span><\/p>\n<\/li>\n<li>\n<p><span style=\"font-weight: 400;\">Serious side effects, which are less common, may include QT prolongation, serotonin syndrome, and allergic reactions. <\/span><\/p>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<section class=\"table-of-contents\">\n<div class=\"anchorLinks\">\n<div class=\"mobile-only\">\n<div class=\"dropdownLists\">\n<div tabindex=\"0\" class=\"dropdownBtn\"><span class=\"listsIcon\"><br \/>\n\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.singlecare.com\/blog\/wp-content\/themes\/singlecare\/images\/union.svg\" width=\"14\" height=\"20\"\/><\/span><br \/>\n\t\t\t\t\t\t\t<label><\/label><br \/>\n\t\t\t\t\t\t\t<span class=\"downArrow\"><br \/>\n\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.singlecare.com\/blog\/wp-content\/themes\/singlecare\/images\/dropDownArrow.svg\" width=\"24\" height=\"24\"\/><br \/>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<p><span style=\"font-weight: 400;\">Ondansetron is a prescription drug used for the prevention of nausea and vomiting in people undergoing cancer chemotherapy, <\/span><span style=\"font-weight: 400;\">radiation therapy<\/span><span style=\"font-weight: 400;\">, or surgery. While Zofran is the brand name, it is no longer available in pharmacies in the U.S. Generic versions\u2014ondansetron oral tablets and orally disintegrating tablets (ODT)\u2014are still commonly prescribed, although many doctors and patients continue to refer to the medication as Zofran.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ondansetron<\/span><span style=\"font-weight: 400;\"> belongs to a class of <\/span><span style=\"font-weight: 400;\">antiemetics<\/span><span style=\"font-weight: 400;\"> (anti-nausea drugs) called 5-HT3 <\/span><span style=\"font-weight: 400;\">receptor antagonists<\/span><span style=\"font-weight: 400;\">. These drugs block <\/span><span style=\"font-weight: 400;\">serotonin<\/span><span style=\"font-weight: 400;\">, a chemical in the brain that passes signals between nerves. By blocking <\/span><span style=\"font-weight: 400;\">serotonin<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> shuts down the \u201cchemoreceptor trigger zone,\u201d the area of the brain responsible for the nausea reflex. <\/span><span style=\"font-weight: 400;\">Ondansetron<\/span><span style=\"font-weight: 400;\"> is a widely used drug, but it may not be right for everyone. <\/span><span style=\"font-weight: 400;\">Side effects<\/span><span style=\"font-weight: 400;\"> can be a problem, particularly for people with certain medical or physical conditions.\u00a0<\/span><\/p>\n<h2 id=\"common-side-effects-of-ondansetron\"><span style=\"font-weight: 400;\">Common side effects<\/span><span style=\"font-weight: 400;\"> of <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The most <\/span><a href=\"https:\/\/medlineplus.gov\/druginfo\/meds\/a601209.html\"><span style=\"font-weight: 400;\">common side effects<\/span><\/a><span style=\"font-weight: 400;\"> of <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Headache<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Drowsiness<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Constipation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tiredness<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Weakness<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Chills<\/span><\/li>\n<\/ul>\n<h2 id=\"serious-side-effects-of-ondansetron\"><span style=\"font-weight: 400;\">Serious side effects<\/span><span style=\"font-weight: 400;\"> of <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Serious side effects are less common, but may occur in some cases, including:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Abnormal heart rhythms<\/span><span style=\"font-weight: 400;\"> (<\/span><span style=\"font-weight: 400;\">arrhythmias<\/span><span style=\"font-weight: 400;\">)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Serotonin syndrome<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Temporary blindness or other vision problems<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hallucinations (seeing or hearing things that are not there)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Drug-induced movement problems (extrapyramidal effects including twitching, slurred speech, and involuntary rolling of the eyes upward)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Severe <\/span><span style=\"font-weight: 400;\">allergic reactions<\/span><span style=\"font-weight: 400;\"> such as <\/span><span style=\"font-weight: 400;\">anaphylaxis<\/span><\/li>\n<\/ul>\n<h3 id=\"ondansetron-and-irregular-heartbeat\"><span style=\"font-weight: 400;\">Ondansetron<\/span><span style=\"font-weight: 400;\"> and <\/span><span style=\"font-weight: 400;\">irregular heartbeat<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Ondansetron<\/span><span style=\"font-weight: 400;\"> can affect the heart\u2019s rhythm. In particular, <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> affects the <\/span><span style=\"font-weight: 400;\">QT interval<\/span><span style=\"font-weight: 400;\">, the time it takes for the bottom chambers of the heart to contract and then fully relax. <\/span><span style=\"font-weight: 400;\">Ondansetron<\/span><span style=\"font-weight: 400;\"> can increase that time, a phenomenon called <\/span><span style=\"font-weight: 400;\">QT prolongation<\/span><span style=\"font-weight: 400;\"> or <\/span><span style=\"font-weight: 400;\">long QT syndrome<\/span><span style=\"font-weight: 400;\">. If <\/span><span style=\"font-weight: 400;\">QT prolongation<\/span><span style=\"font-weight: 400;\"> is too great, the bottom chambers lose their rhythm and start to beat irregularly, causing conditions such as <\/span><span style=\"font-weight: 400;\">torsades<\/span> <span style=\"font-weight: 400;\">de pointes<\/span><span style=\"font-weight: 400;\">, a potentially life-threatening heart condition. When taking <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\">, get immediate <\/span><span style=\"font-weight: 400;\">medical attention<\/span><span style=\"font-weight: 400;\"> at any <\/span><a href=\"https:\/\/www.cedars-sinai.org\/health-library\/diseases-and-conditions\/l\/long-qt-syndrome.html\"><span style=\"font-weight: 400;\">sign of <\/span><span style=\"font-weight: 400;\">QT prolongation<\/span><\/a><span style=\"font-weight: 400;\">, such as:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Palpitations<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Shortness of breath<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Chest pain<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Lightheadedness<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fainting<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Healthcare providers do not know the <\/span><a href=\"https:\/\/www.pdr.net\/drug-summary\/Zofran-ODT-Orally-Disintegrating-Tablets--Oral-Solution--and-Tablets-ondansetron----ondansetron-hydrochloride-244\"><span style=\"font-weight: 400;\">exact incidence<\/span><\/a><span style=\"font-weight: 400;\"> of <\/span><span style=\"font-weight: 400;\">QT prolongation<\/span><span style=\"font-weight: 400;\"> in people taking <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\">, but as a <\/span><span style=\"font-weight: 400;\">side effect<\/span><span style=\"font-weight: 400;\">, it is more likely in people who already have <\/span><span style=\"font-weight: 400;\">heart rhythm<\/span> <span style=\"font-weight: 400;\">abnormalities<\/span><span style=\"font-weight: 400;\">, a family history of <\/span><span style=\"font-weight: 400;\">QT prolongation<\/span><span style=\"font-weight: 400;\">, slow heart rate, <\/span><span style=\"font-weight: 400;\">congestive heart failure<\/span><span style=\"font-weight: 400;\">, heart attack, or an electrolyte imbalance such as low <\/span><span style=\"font-weight: 400;\">magnesium<\/span><span style=\"font-weight: 400;\">, calcium, or <\/span><span style=\"font-weight: 400;\">potassium<\/span><span style=\"font-weight: 400;\"> levels. It is also more likely when <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> is combined with other drugs that lengthen the <\/span><span style=\"font-weight: 400;\">QT interval,<\/span><span style=\"font-weight: 400;\"> such as selective <\/span><span style=\"font-weight: 400;\">serotonin<\/span><span style=\"font-weight: 400;\"> reuptake <\/span><span style=\"font-weight: 400;\">inhibitors<\/span><span style=\"font-weight: 400;\"> (<\/span><span style=\"font-weight: 400;\">SSRIs<\/span><span style=\"font-weight: 400;\">), <\/span><span style=\"font-weight: 400;\">antipsychotics<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">antifungal drugs<\/span><span style=\"font-weight: 400;\">, and some types of antibiotics.<\/span><\/p>\n<h3 id=\"ondansetron-and-serotonin-syndrome\"><span style=\"font-weight: 400;\">Ondansetron<\/span><span style=\"font-weight: 400;\"> and <\/span><span style=\"font-weight: 400;\">serotonin syndrome<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Serotonin syndrome<\/span><span style=\"font-weight: 400;\"> is a drug-induced condition that can occur when <\/span><span style=\"font-weight: 400;\">serotonin<\/span><span style=\"font-weight: 400;\"> levels in the brain get too high. Symptoms are often mild and last for only a few days, but the most severe cases can be life-threatening. In many cases, <\/span><span style=\"font-weight: 400;\">serotonin syndrome<\/span><span style=\"font-weight: 400;\"> is brought on by taking more than one drug that affects <\/span><span style=\"font-weight: 400;\">serotonin<\/span><span style=\"font-weight: 400;\"> levels. However, <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> and similar drugs\u20145-HT3 <\/span><span style=\"font-weight: 400;\">receptor antagonists<\/span><span style=\"font-weight: 400;\"> such as granisetron\u2014can cause <\/span><span style=\"font-weight: 400;\">serotonin syndrome<\/span><span style=\"font-weight: 400;\"> when taken alone. The exact incidence is not known, but get immediate medical help at any sign of <\/span><span style=\"font-weight: 400;\">serotonin syndrome,<\/span><span style=\"font-weight: 400;\"> such as:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Agitation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hallucinations<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Rapid heartbeat<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">High or low <\/span><span style=\"font-weight: 400;\">blood pressure<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dizziness<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sweating<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Flushing<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fever<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tremor<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Muscle rigidity<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Overactive reflexes<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Loss of coordination<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Nausea<\/span><\/li>\n<\/ul>\n<div id=\"coupon-cta\" class=\"coupon-cta master-template\">\n<p id=\"headline\">Save up to 80% on Ondansetron with <\/p>\n<p id=\"subheadline\">Different pharmacies offer different prices for the same medication.  helps find the best price for you.<\/p>\n<div class=\"details-wrap\">\n<p>\n\t\t\t\t\tOndansetron 4 mg (10 Tablet)\t\t\t\t<\/p>\n<p>\n\t\t\t\t\t23666 &#8211; Hampton, VA\t\t\t\t<\/p>\n<\/p><\/div>\n<div class=\"api-response\">\n<div class=\"coupon\">\n<div class=\"logo\">\n\t\t\t<img decoding=\"async\" src=\"https:\/\/images.singlecare.com\/content\/images\/pharmacy\/logo-color-kroger.svg\" alt=\"Kroger Pharmacy\"\/>\t\t\t<\/div>\n<\/p><\/div>\n<div class=\"coupon\">\n<div class=\"logo\">\n\t\t\t<img decoding=\"async\" src=\"https:\/\/images.singlecare.com\/content\/images\/pharmacy\/logo-color-harristeeter.svg\" alt=\"Harris Teeter Pharmacy\"\/>\t\t\t<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p>\t\t\tSee Ondansetron prices at all pharmacies\n\t\t<\/p><\/div>\n<h2 id=\"how-long-do-ondansetron-side-effects-last\"><span style=\"font-weight: 400;\">How long do <\/span><span style=\"font-weight: 400;\">ondansetron<\/span> <span style=\"font-weight: 400;\">side effects<\/span><span style=\"font-weight: 400;\"> last?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Most common <\/span><span style=\"font-weight: 400;\">ondansetron<\/span> <span style=\"font-weight: 400;\">side effects<\/span><span style=\"font-weight: 400;\"> such as headache, <\/span><span style=\"font-weight: 400;\">drowsiness<\/span><span style=\"font-weight: 400;\">, or <\/span><span style=\"font-weight: 400;\">constipation<\/span><span style=\"font-weight: 400;\"> go away when the drug is discontinued. <\/span><span style=\"font-weight: 400;\">Ondansetron<\/span><span style=\"font-weight: 400;\"> has a <\/span><a href=\"https:\/\/pubchem.ncbi.nlm.nih.gov\/compound\/4595#section=Metabolism-Metabolites\"><span style=\"font-weight: 400;\">half-life<\/span><\/a><span style=\"font-weight: 400;\"> of three to four hours in healthy adults, but this may be increased to six to eight hours in older adults. This means it takes the body three to four hours to eliminate half a dose of <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> from the body, so the entire dose should be eliminated in 15 to 20 hours (if no more doses are taken). That\u2019s when most <\/span><span style=\"font-weight: 400;\">side effects<\/span><span style=\"font-weight: 400;\"> should fade.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Some more <\/span><span style=\"font-weight: 400;\">serious side effects<\/span><span style=\"font-weight: 400;\"> may take longer to resolve. Some, like <\/span><span style=\"font-weight: 400;\">serotonin syndrome<\/span><span style=\"font-weight: 400;\">, severe <\/span><span style=\"font-weight: 400;\">allergic reactions<\/span><span style=\"font-weight: 400;\">, or <\/span><span style=\"font-weight: 400;\">heart rhythm<\/span> <span style=\"font-weight: 400;\">abnormalities<\/span><span style=\"font-weight: 400;\">, may require emergency medical treatment to get better. Severe <\/span><span style=\"font-weight: 400;\">heart rhythm<\/span><span style=\"font-weight: 400;\"> problems, however, may produce long-lasting or lifelong complications.<\/span><\/p>\n<h2 id=\"ondansetron-interactions-contraindications-and-warnings\"><span style=\"font-weight: 400;\">Ondansetron<\/span><span style=\"font-weight: 400;\"> interactions, contraindications, and warnings<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Physical and <\/span><span style=\"font-weight: 400;\">medical conditions<\/span><span style=\"font-weight: 400;\"> may affect the safety or effectiveness of <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\">, so some people may not be able to take <\/span><span style=\"font-weight: 400;\">ondansetron,<\/span><span style=\"font-weight: 400;\"> and others may require <\/span><span style=\"font-weight: 400;\">dosing<\/span><span style=\"font-weight: 400;\"> changes or closer monitoring for adverse reactions.<\/span><\/p>\n<h3 id=\"interactions\"><span style=\"font-weight: 400;\">Interactions<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">As with any other prescription drug, certain <\/span><span style=\"font-weight: 400;\">drug interactions<\/span><span style=\"font-weight: 400;\"> can cause problems when people are taking <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\">. Before taking this medicine, make sure your health care provider and pharmacist know about all the medicines you take, including prescription drugs, OTC medicines, and vitamins or supplements.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Some drug interactions with ondansetron include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The Parkinson\u2019s medication Apokyn (<\/span><span style=\"font-weight: 400;\">apomorphine<\/span><span style=\"font-weight: 400;\">)\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Azole antifungal drugs<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Certain antibiotics<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Additionally, <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> may interact with drugs that affect serotonin levels, including:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Some interactions will require avoiding a drug, while others may require adjusting the dose. Talk to your healthcare provider about drug interactions and how they may affect you.\u00a0<\/span><\/p>\n<h3 id=\"abuse-and-dependence\"><span style=\"font-weight: 400;\">Abuse and dependence<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The <\/span><span style=\"font-weight: 400;\">U.S. Food and Drug Administration<\/span><span style=\"font-weight: 400;\"> (<\/span><span style=\"font-weight: 400;\">FDA<\/span><span style=\"font-weight: 400;\">) does not classify <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> as a <\/span><span style=\"font-weight: 400;\">controlled substance<\/span><span style=\"font-weight: 400;\">, meaning it has no potential for abuse or physical dependence. <\/span><span style=\"font-weight: 400;\">Ondansetron<\/span><span style=\"font-weight: 400;\"> is given either as a single dose or for no longer than a few days at a time during <\/span><span style=\"font-weight: 400;\">cancer treatment<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">radiation treatment<\/span><span style=\"font-weight: 400;\">, or surgery. Withdrawal symptoms are not experienced when <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> treatment is discontinued.<\/span><\/p>\n<h3 id=\"overdose\"><span style=\"font-weight: 400;\">Overdose<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">An overdose of <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> can be a serious medical emergency, so get emergency <\/span><span style=\"font-weight: 400;\">medical attention<\/span><span style=\"font-weight: 400;\"> if too much <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> has been taken. An <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> overdose <\/span><a href=\"https:\/\/www.mayoclinic.org\/drugs-supplements\/ondansetron-oral-route-oromucosal-route\/proper-use\/drg-20074421#\"><span style=\"font-weight: 400;\">may cause symptoms<\/span><\/a><span style=\"font-weight: 400;\"> such as temporary vision loss, severe <\/span><span style=\"font-weight: 400;\">constipation<\/span><span style=\"font-weight: 400;\">, low blood pressure, lightheadedness, and fainting. In addition, <\/span><span style=\"font-weight: 400;\">serotonin syndrome<\/span><span style=\"font-weight: 400;\"> has been reported in children who have overdosed on <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3 id=\"restrictions\"><span style=\"font-weight: 400;\">Restrictions<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">When a drug is never given to people with certain <\/span><span style=\"font-weight: 400;\">medical conditions<\/span><span style=\"font-weight: 400;\">, those <\/span><span style=\"font-weight: 400;\">medical conditions<\/span><span style=\"font-weight: 400;\"> are called contraindications. <\/span><span style=\"font-weight: 400;\">Ondansetron<\/span><span style=\"font-weight: 400;\"> is contraindicated in:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">People who are allergic to <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> or any ingredient in the medicine<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">People who have congenital long QT syndrome<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">People who take the medicine apomorphine<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Health care professionals<\/span><span style=\"font-weight: 400;\"> will avoid <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> or use it cautiously in people with <\/span><a href=\"https:\/\/www.mayoclinic.org\/drugs-supplements\/ondansetron-oral-route-oromucosal-route\/proper-use\/drg-20074421#\"><span style=\"font-weight: 400;\">certain <\/span><span style=\"font-weight: 400;\">medical conditions<\/span><\/a><span style=\"font-weight: 400;\"> such as:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>People with a family history of <\/b><b>long QT syndrome<\/b><span style=\"font-weight: 400;\"> because of the risk of serious <\/span><span style=\"font-weight: 400;\">heart rhythm<\/span> <span style=\"font-weight: 400;\">abnormalities<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">People with a history of <\/span><b>heart rhythm abnormalities, heart attack, or heart failure<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Irregular heartbeats<\/span><span style=\"font-weight: 400;\"> are also a risk if <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> is given to people with <\/span><b>electrolyte imbalances<\/b><span style=\"font-weight: 400;\">, particularly low <\/span><span style=\"font-weight: 400;\">magnesium<\/span><span style=\"font-weight: 400;\">, low <\/span><span style=\"font-weight: 400;\">potassium<\/span><span style=\"font-weight: 400;\">, or low calcium.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ondansetron<\/span><span style=\"font-weight: 400;\"> is used cautiously and with extra monitoring in people at risk of <\/span><b>gastrointestinal obstruction<\/b><span style=\"font-weight: 400;\">, including people who have undergone recent <\/span><b>abdominal surgery<\/b><span style=\"font-weight: 400;\">.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">P<\/span><span style=\"font-weight: 400;\">eople with <\/span><b>phenylketonuria<\/b><span style=\"font-weight: 400;\">, <\/span><a href=\"https:\/\/www.ncbi.nlm.nih.gov\/books\/NBK535378\/\"><span style=\"font-weight: 400;\">a hereditary condition<\/span><\/a><span style=\"font-weight: 400;\"> that can produce a toxic buildup in the body of the amino acid phenylalanine.\u00a0<\/span><\/li>\n<\/ul>\n<h2 id=\"how-to-avoid-ondansetron-side-effects\"><span style=\"font-weight: 400;\">How to avoid ondansetron <\/span><span style=\"font-weight: 400;\">side effects<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">For the most part, <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\">\u2019s <\/span><span style=\"font-weight: 400;\">side effects<\/span><span style=\"font-weight: 400;\"> are minor\u2014usually a headache, <\/span><span style=\"font-weight: 400;\">drowsiness<\/span><span style=\"font-weight: 400;\">, and <\/span><span style=\"font-weight: 400;\">constipation<\/span><span style=\"font-weight: 400;\">. A few tips, however, can reduce both the incidence and severity of <\/span><span style=\"font-weight: 400;\">side effects<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3 id=\"1-take-ondansetron-as-directed\"><span style=\"font-weight: 400;\">1. Take <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> as directed<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Take <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> tablets exactly as instructed. Do not skip a dose or stop taking the medicine early. The doctor may give special instructions if you vomit after taking <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> tablets, so follow these instructions carefully.<\/span><\/p>\n<h3 id=\"2-tell-the-healthcare-provider-about-all-medical-conditions\"><span style=\"font-weight: 400;\">2. Tell the healthcare provider about all <\/span><span style=\"font-weight: 400;\">medical conditions<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The first step in avoiding <\/span><span style=\"font-weight: 400;\">serious side effects<\/span><span style=\"font-weight: 400;\"> is to make sure the prescribing <\/span><span style=\"font-weight: 400;\">healthcare professional<\/span><span style=\"font-weight: 400;\"> knows about your <\/span><span style=\"font-weight: 400;\">medical conditions<\/span><span style=\"font-weight: 400;\"> and medical history. For <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">side effects<\/span><span style=\"font-weight: 400;\"> are more likely in people with the following <\/span><span style=\"font-weight: 400;\">medical conditions<\/span><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Heart disease<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Heart rhythm<\/span> <span style=\"font-weight: 400;\">abnormalities<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Slow heartbeats<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Electrolyte imbalance<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Any history or family history of <\/span><span style=\"font-weight: 400;\">QT prolongation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Any intestinal blockage<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Liver disease<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Any history of allergies to <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\">, granisetron, palonosetron, or dolasetron<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">While there is no certainty about the risks, make sure to tell the healthcare provider about pregnancy, <\/span><span style=\"font-weight: 400;\">breastfeeding<\/span><span style=\"font-weight: 400;\">, or any plans to get pregnant or breastfeed.<\/span><\/p>\n<h3 id=\"3-tell-the-healthcare-provider-about-all-medications\"><span style=\"font-weight: 400;\">3. Tell the healthcare provider about all medications<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Drug interactions<\/span><span style=\"font-weight: 400;\"> between <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\"> and other medications can also cause problems. The healthcare provider particularly needs to know if you are taking any of the following medications:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Do not take other prescriptions or <\/span><span style=\"font-weight: 400;\">over-the-counter<\/span><span style=\"font-weight: 400;\"> medicines until checking in with a doctor or other healthcare provider.<\/span><\/p>\n<h3 id=\"4-be-careful-about-driving-and-other-risky-activities\"><span style=\"font-weight: 400;\">4. Be careful about driving and other risky activities<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Ondansetron<\/span><span style=\"font-weight: 400;\"> can cause <\/span><span style=\"font-weight: 400;\">drowsiness<\/span><span style=\"font-weight: 400;\">, dizziness, and other impairments. For most people, these effects will be minor. Still, it\u2019s a good idea to be careful about driving, operating machinery, or participating in potentially hazardous activities when taking <\/span><span style=\"font-weight: 400;\">ondansetron<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3 id=\"5-contact-a-healthcare-provider-if-vomiting-continues\"><span style=\"font-weight: 400;\">5. Contact a healthcare provider if vomiting continues<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">If vomiting continues, contact a healthcare provider. An additional dose may be prescribed or the healthcare provider may switch to another medication.<\/span><\/p>\n<h3 id=\"6-watch-for-signs-of-heart-rhythm-problems\"><span style=\"font-weight: 400;\">6. Watch for signs of <\/span><span style=\"font-weight: 400;\">heart rhythm<\/span><span style=\"font-weight: 400;\"> problems<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Get medical help right away if there are any signs of heartbeat problems such as palpitations, lightheadedness, or <\/span><span style=\"font-weight: 400;\">chest pain<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3 id=\"7-watch-for-signs-of-intestinal-problems\"><span style=\"font-weight: 400;\">7. Watch for signs of intestinal problems<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Consult with a healthcare provider if abdominal pain or swelling is experienced. 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serious side effects of ondansetron (Zofran) in 2025 Key takeaways Ondansetron is a generic prescription drug used to prevent nausea and vomiting from chemotherapy, radiation, and surgery. Common side effects include headache, drowsiness, constipation, tiredness, weakness, and chills. Serious side effects, which are less common, may include QT prolongation, serotonin [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-8084","post","type-post","status-publish","format-standard","hentry","category-health-news"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/healthmedicinet.com\/review\/wp-json\/wp\/v2\/posts\/8084","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/healthmedicinet.com\/review\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/healthmedicinet.com\/review\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/healthmedicinet.com\/review\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/healthmedicinet.com\/review\/wp-json\/wp\/v2\/comments?post=8084"}],"version-history":[{"count":0,"href":"https:\/\/healthmedicinet.com\/review\/wp-json\/wp\/v2\/posts\/8084\/revisions"}],"wp:attachment":[{"href":"https:\/\/healthmedicinet.com\/review\/wp-json\/wp\/v2\/media?parent=8084"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/healthmedicinet.com\/review\/wp-json\/wp\/v2\/categories?post=8084"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/healthmedicinet.com\/review\/wp-json\/wp\/v2\/tags?post=8084"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}