Generic name: aprepitant (ap-RE-pi-tant)
Drug class: NK1 receptor antagonists
Medically reviewed by Drugs.com. Last updated on Sep 22, 2021.
Commonly used brand name(s)
In the U.S.
Available Dosage Forms:
Therapeutic Class: Antiemetic
Pharmacologic Class: Neurokinin-1 Receptor Antagonist
Uses for aprepitant
Aprepitant injection is used together with other medicines (eg, dexamethasone, granisetron, ondansetron) to prevent acute and delayed nausea and vomiting caused by cancer medicines (chemotherapy). It is a substance P/neurokinin 1 (NK1) receptor antagonist that works by blocking the signals to the brain that cause nausea and vomiting.
Aprepitant is given only by or under the direct supervision of your doctor.
Before using aprepitant
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For aprepitant, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to aprepitant or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Appropriate studies have not been performed on the relationship of age to the effects of aprepitant injection in the pediatric population. Safety and efficacy have not been established.
Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of aprepitant injection in the elderly. However, elderly patients are more likely to have age-related liver, kidney, or heart problems, which may require caution and an adjustment in the dose for patients receiving aprepitant.
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Interactions with medicines
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are receiving aprepitant, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using aprepitant with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.
Using aprepitant with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
- Doxorubicin Hydrochloride Liposome
- Ethinyl Estradiol
- Sirolimus Protein-Bound
- St John's Wort
Using aprepitant with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Interactions with food/tobacco/alcohol
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using aprepitant with any of the following is usually not recommended, but may be unavoidable in some cases. If used together, your doctor may change the dose or how often you use aprepitant, or give you special instructions about the use of food, alcohol, or tobacco.
- Grapefruit Juice
Other medical problems
The presence of other medical problems may affect the use of aprepitant. Make sure you tell your doctor if you have any other medical problems, especially:
- Liver disease, severe—Use with caution. May make this condition worse.
Proper use of aprepitant
A nurse or other trained health professional will give you aprepitant in a medical facility. It is given through a needle placed into one of your veins.
Aprepitant may be injected for at least 2 minutes. It may also be given slowly, so the IV tube will have to stay in place for at least 30 minutes. It will be given on the first day of your chemotherapy session, along with other medicines (eg, dexamethasone, granisetron, ondansetron) about 30 minutes before the start of treatment.
Aprepitant comes with a patient information leaflet. Read and follow the instructions carefully. Ask your doctor if you have any questions.
Precautions while using aprepitant
Check with your doctor if severe nausea and vomiting continue after leaving the medical facility.
Do not receive aprepitant if you are also using pimozide (Orap®). Using these medicines together may cause serious unwanted effects.
Birth control that contains hormones (eg, pills, rings, implants, other devices) may not work as well to prevent pregnancy when used with aprepitant. Use another form of birth control (including condoms or spermicide) along with your pills during treatment with aprepitant and for 1 month after the last dose. If you think you have become pregnant while using the medicine, tell your doctor right away.
Aprepitant may cause a serious allergic reaction, called anaphylaxis, which can be life-threatening and requires immediate medical attention. Tell your doctor right away if you have a rash, itching, hoarseness, trouble breathing, trouble swallowing, or any swelling of your hands, face, or mouth after receiving aprepitant.
Aprepitant may decrease the prothrombin time (time it takes for your blood to clot) when used together with warfarin (Coumadin®) in patients with blood clotting problems. Talk to your doctor if you have concerns.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.
Aprepitant side effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
- Bloody, black, or tarry stools
- burning feeling while urinating
- chest pain or discomfort
- defects in intelligence, short-term memory, learning ability, and attention
- difficult or painful urination
- fast, irregular, pounding, or racing heartbeat or pulse
- frequent urination
- general feeling of discomfort or illness
- increased sensitivity of the skin to sunlight
- increased volume of pale, dilute urine
- lightheadedness, dizziness, or fainting
- lower back or side pain
- pale skin
- redness or other discoloration of the skin
- severe and continuing nausea
- severe stomach pain, cramping, burning
- severe sunburn
- slow heartbeat
- sore throat
- tender, swollen glands in the neck
- trouble breathing
- trouble walking
- troubled breathing with exertion
- ulcers, sores, or white spots in the mouth
- unusual bleeding or bruising
- unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness
- vomiting of material that looks like coffee grounds
Incidence not known
- Blistering, peeling, or loosening of the skin
- difficulty swallowing
- hives, itching, skin rash
- joint or muscle pain
- puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
- red skin lesions, often with a purple center
- red, irritated eyes
- tightness in the chest
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- Abnormal dreams
- body aches or pain
- burning, dry, or itching eyes
- change or loss in taste
- confusion about identity, place, and time
- continuing ringing or buzzing or other unexplained noise in the ears
- discharge, excessive tearing
- dry throat
- false or unusual sense of well-being
- feeling of warmth
- hearing loss
- increased sweating
- increased thirst
- muscle cramp or weakness
- oily skin
- redness of the face, neck, arms and occasionally, upper chest
- redness, pain, swelling of the eye, eyelid, or inner lining of the eyelid
- runny nose
- sleepiness or unusual drowsiness
- stomach discomfort
- voice changes
- weight gain
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
Frequently asked questions
More about aprepitant
- Side Effects
- During Pregnancy
- Dosage Information
- Drug Images
- Drug Interactions
- Pricing & Coupons
- En Español
- 13 Reviews
- Drug class: NK1 receptor antagonists
- Drug Information
- Aprepitant (Advanced Reading)
- Aprepitant Capsules
- Aprepitant Injection
- Aprepitant Oral Suspension
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