aprepitant(redirected from fosaprepitant)
aprepitant (oral)(a-prep-i-tant) ,
fosaprepitant (injection)(fos-a-prep-i-tant) ,
Pregnancy Category: B
Pharmacologic: neurokinin antagonists
Pharmacologic: neurokinin antagonists
Oral: Intravenous: Prevention of:
- Acute and delayed nausea and vomiting associated with initial and repeat courses of highly emetogenic chemotherapy,
- Nausea and vomiting associated with initial and repeat courses of moderately emetogenic chemotherapy.
Acts as a selective antagonist at substance P/neurokinin 1 (NK1) receptors in the brain.
Decreased nausea and vomiting associated with chemotherapy.
Augments the antiemetic effects of dexamethasone and 5-HT3 antagonists (ondansetron).
Absorption: 60–65% absorbed following oral administration. Following IV administration, fosaprepitant is rapidly converted to aprepitant, the active component.
Distribution: Crosses the blood brain barrier; remainder of distribution unknown.
Metabolism and Excretion: Mostly metabolized by the liver (CYP3A4 enzyme system); not renally excreted.
Half-life: Aprepitant—9–13 hr.
Time/action profile (antiemetic effect)
|PO||1 hr||4 hr*||24 hr|
|IV||rapid||end of infusion*||24 hr|
Contraindicated in: Hypersensitivity;Concurrent use with pimozide (risk of life-threatening adverse cardiovascular reactions); Lactation: May cause unwanted effects in nursing infants.
Use Cautiously in: Concurrent use with any agents metabolized by CYP3A4; Obstetric: Use only if clearly needed; Pediatric: Safety not established.
Adverse Reactions/Side Effects
- stevens-johnson syndrome (life-threatening)
- hypersensitivity reaction (flushing, erythema, dyspnea) (IV)
Drug-Drug interactionAprepitant inhibits, induces, and is metabolized by the CYP3A4 enzyme system; it also induces the CYP2C9 system. Concurrent use with other medications that are metabolized by CYP3A4 may result in ↑ toxicity from these agents including docetaxel, paclitaxel, etoposide, irinotecan, ifosfamide, imatinib, vinorelbine, vinblastine, vincristine, midazolam, triazolam, and alprazolam ; concurrent use should be undertaken with caution.Concurrent use with drugs that significantly inhibit the CYP3A4 enzyme system including (ketoconazole, itraconazole, nefazodone, clarithromycin, ritonavir, nelfinavir, and diltiazem ) may ↑ blood levels and effects of aprepitant.Concurrent use with drugs that induce the CYP3A4 enzyme system including rifampin, carbamazepine, and phenytoin may ↓ blood levels and effects of aprepitant.↑ blood levels and effects of dexamethasone (regimen reflects a 50% dose reduction); a similar effect occurs with methylprednisolone (↓ IV dose by 25%, ↓ PO dose by 50% when used concurrently).May ↓ the effects of warfarin (careful monitoring for 2 wk recommended), oral contraceptives (use alternate method), and phenytoin.
Prevention of Nausea and Vomiting Associated with Highly Emetogenic Chemotherapy
Oral (Adults) 125 mg 1 hr prior to chemotherapy (Day 1) (with dexamethasone 12 mg PO 30 min prior to chemotherapy and a 5-HT3 antagonist prior to chemotherapy), then 80 mg once daily for 2 days (Days 2 and 3) (with dexamethasone 8 mg once daily for 3 days [Days 2–4]).
Intravenous (Adults) Single-dose regimen—150 mg 30 min prior to chemotherapy on Day 1 (with dexamethasone 12 mg PO 30 min prior to chemotherapy and a 5-HT3 antagonist prior to chemotherapy). Continue dexamethasone on Days 2–4 (8 mg PO on Day 2, 8 mg twice daily on Days 3 and 4); 3–day regimen—115 mg 30 min prior to chemotherapy on Day 1 (with dexamethasone 12 mg PO 30 min prior to chemotherapy and a 5-HT3 antagonist prior to chemotherapy). Continue aprepitant 80 mg PO on Days 2 and 3. Continue dexamethasone 8 mg once daily on Days 2–4.
Prevention of Nausea and Vomiting Associated with Moderately Emetogenic Chemotherapy
Oral (Adults) 125 mg 1 hr prior to chemotherapy (Day 1) (with dexamethasone 12 mg PO 30 min prior to chemotherapy and a 5-HT3 antagonist), then 80 mg once daily for 2 days (Days 2 and 3).
Intravenous (Adults) 115 mg 30 min prior to chemotherapy on Day 1 (should be given with dexamethasone 12 mg PO 30 min prior to chemotherapy and a 5-HT3 antagonist). Continue aprepiptant 80 mg PO once daily on Days 2 and 3.
Prevention of Postoperative Nausea and Vomiting
Oral (Adults) 40 mg given within 3 hr prior to induction of anesthesia.
Capsules: 40 mg, 80 mg, 125 mg
Lyophilized solid (requires reconsititution prior to injection): 115 mg/vial, 150 mg/vial
- Assess nausea, vomiting, appetite, bowel sounds, and abdominal pain prior to and following administration.
- Monitor hydration, nutritional status, and intake and output. Patients with severe nausea and vomiting may require IV fluids in addition to antiemetics.
- Assess for rash periodically during therapy. May cause Stevens-Johnson syndrome. Discontinue therapy if severe or if accompanied with fever, general malaise, fatigue, muscle or joint aches, blisters, oral lesions, conjunctivitis, hepatitis and/or eosinophilia.
- Lab Test Considerations: Monitor clotting status closely during the 2 wk period, especially at 7–10 days, following aprepitant therapy in patients on chronic warfarin therapy.
- May cause mild, transient ↑ in alkaline phosphatase, AST, ALT, and BUN.
- May cause proteinuria, erythrocyturia, leukocyturia, hyperglycemia, hyponatremia, and ↑ leukocytes.
- May cause ↓ hemoglobin and WBC.
Potential Nursing DiagnosesRisk for deficient fluid volume (Indications)
Imbalanced nutrition: less than body requirements (Indications)
- For chemotherapy, aprepitant is given as part of a regimen that includes a corticosteroid and a 5-HT3 antagonist (see Route/Dosage).
- Oral: Administer daily for 3 days. Day 1—administer 125 mg 1 hr prior to chemotherapy. Days 2 and 3—administer 80 mg once in the morning. May be administered without regard to food.
- Single-Dose Regimen: Intermittent Infusion: Inject 5 mL of 0.9% NaCl for Injection into vial. Swirl gently; avoid shaking or jetting saline into vial. Diluent: Prepare an infusion bag of 145 mL 0.9% NaCl. Withdraw entire volume from vial, and transfer to infusion bag for a total volume of 150 mL. Concentration: 1 mg/mL. Gently invert bag 2–3 times. Solution is stable for 24 hr at room temperature. Inspect solution for particulate matter. Do not administer solutions that are discolored or contain particulate matter.
- Rate: Infuse over 20–30 min.
- 3-Day Regimen: Intermittent Infusion: Inject 5 mL of 0.9% NaCl for Injection into vial. Swirl gently; avoid shaking or jetting saline into vial. Diluent: Prepare an infusion bag of 110 mL 0.9% NaCl. Withdraw entire volume from vial, and transfer to infusion bag for a total volume of 115 mL. Concentration: 1 mg/mL. Gently invert bag 2–3 times. Solution is stable for 24 hr at room temperature. Inspect solution for particulate matter. Do not administer solutions that are discolored or contain particulate matter.
- Rate: Administer over 15 min.
- Y-Site Compatibility: dexamethasone, granisetron, methylprednisolone, ondansetron, palonosetron
- Solution Incompatibility: Incompatible with solutions containing divalent cations (calcium, magnesium) including LR and Hartmann's solution.
- Instruct patient to take aprepitant as directed. Direct patient to read the Patient Package Insert before starting therapy and to reread it each time the prescription is renewed.
- Instruct patient to notify health care professional if nausea and vomiting occur prior to administration.
- Advise patient to notify health care professional immediately if symptoms of hypersensitivity reaction (hives, rash, itching, redness of the face/skin, difficulty in breathing or swallowing) occur.
- Instruct patient to notify health care professional of all Rx or OTC medications, vitamins, or herbal products being taken and consult health care professional before taking any new medications.
- Caution patient that fosaprepitant may decrease the effectiveness of oral contraceptives. Advise patient to use alternate nonhormonal methods of contraception during and for 1 mo following treatment. Advise patient to notify health care professional if pregnancy is planned or suspected or if breast feeding.
- Advise patient and family to use general measures to decrease nausea (begin with sips of liquids and small, nongreasy meals; provide oral hygiene; remove noxious stimuli from environment).
- Decreased nausea and vomiting associated with chemotherapy.
- Prevention of postoperative nausea and vomiting.
an antiemetic agent.
indications This drug is used to prevent nausea and vomiting associated with cancer chemotherapy (including high-dose cisplatin). It is used in combination with other antiemetics.
contraindications Known hypersensitivity to this drug prohibits its use.
adverse effects Adverse effects of this drug include insomnia, anxiety, depression, confusion, peripheral neuropathy, bradycardia, deep vein thrombosis, hypertension, abdominal pain, anorexia, gastritis, vomiting, heartburn, serum creatine, proteinuria, dysuria, anemia, asthenia, fatigue, dehydration, fever, hiccups, tinnitus, and increased aspartate aminotransferase, alanine aminotransferase, and blood urea nitrogen. Life-threatening side effects include thrombocytopenia and neutropenia. Common side effects include headache, dizziness, diarrhea, constipation, and nausea.