Compare Zofran vs. Emend

Head-to-head comparisons of medication uses, side effects, ratings, and more.


Zofran (ondansetron)

Prescription only

Emend (aprepitant)

Prescription only
Helps prevent nausea and vomiting.

Zofran (ondansetron) works well to prevent nausea and vomiting. It's available in different forms that you don't have to swallow in case you can't keep anything down.

3.6/ 5 average rating with 366 reviewsforZofran
Stops nausea and vomitting caused by chemotherapy and surgery.

Emend (aprepitant) is used with other medicines to stop nausea and vomiting that can happen after chemotherapy and surgery.

  • Zofran (ondansetron) comes in many different forms that you don't have to swallow, such as a film that goes on the tongue or a dissolving pill.
  • Zofran (ondansetron) is fast-acting and starts working within 30 minutes.
  • Unlike some other nausea medicines, the side effects for Zofran (ondansetron) are relatively mild.
  • Emend (aprepitant) can help stop nausea that lasts several days after receiving chemo, which is harder to control than the nausea that starts immediately.
  • Emend (aprepitant) can also be used to stop nausea in adults that happens after surgery.
  • Emend (aprepitant) also comes as a liquid for children over 6 months and adults who can't take pills.
  • The side effects of Emend (aprepitant) are usually mild and include hiccups and fatigue.
  • Zofran (ondansetron) doesn't treat nausea and vomiting that's already happening. It only works to prevent future episodes.
  • High doses of Zofran (ondansetron) can cause problems with heart rhythm if you're at risk.
  • If you are also taking antidepressants, you are at higher risk of developing a dangerous condition called serotonin syndrome. Talk with your doctor about your risks.
  • Emend (aprepitant) only stops nausea and vomiting from happening. It won't work if you already have nausea and vomiting.
  • Emend (aprepitant) has to be used in combination with other medicines to treat chemotherapy related nausea.
  • Emend (aprepitant) needs to be taken for the first three days of chemo.
Used for
  • Nausea and vomiting due to cancer medicines
  • Prevention of nausea and vomiting due to radiation therapy and after surgery
  • Severe nausea and vomiting in pregnancy
  • Prevention of acute and delayed nausea and vomiting associated with highly-emetogenic chemotherapy
  • Prevention of acute and delayed nausea and vomiting associated with moderately-emetogenic chemotherapy
  • Prevention of postoperative nausea and vomiting
Dosage forms
  • Pill
  • Disintegrating tablet
  • Liquid
  • Sublingual film
  • Pill
  • Liquid
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366 reviews so far
saidit'sworth it
saiditworked well
saidit'sa big hassle

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Side effects
8possible side effects
  • Headache
  • Oxygen deficiency
  • Fever
  • Dizziness
  • Gynecologic problems
  • Anxiety
  • Problems urinating
  • Itching
See more detailed side effects
6possible side effects
  • Fatigue
  • Diarrhea
  • Weakness
  • Indigestion
  • Hiccups
  • Lower white blood cells
See more detailed side effects
Risks and risk factors
  • Serotonin syndrome
    • Taking antidepressants, lithium, or some migraine medicines with Zofran (ondansetron).
  • Heart rhythm problems
    • History of long QT syndrome
    • Very high doses of Zofran (ondansetron)
    • Taking other medicines causing heart rhythm problems
    • Low magneium or potassium
    • Heart failure
  • Masking of intestinal blockage and stomach bloating
    • Abdominal surgery
    • Chemotherapy
See more detailed risks and warnings
  • Drug Interactions
  • Decreased INR when used with warfarin (Coumadin)
    • Taking warfarin with Emend (aprepitant)
  • Risk of reduced efficacy of hormone based birth control
    • Taking hormone-based birth control
See more detailed risks and warnings