Standard Emend Dosing for Chemotherapy
Emend (fosaprepitant/aprepitant) prevents nausea and vomiting from highly emetogenic chemotherapy like cisplatin. Adults typically take three 125 mg capsules: one on day 1 (1 hour before chemo), one on day 2, and one on day 3.[1]
Why Three Capsules?
This 3-day regimen targets acute and delayed nausea. Day 1 pairs with IV fosaprepitant or oral meds like ondansetron and dexamethasone; days 2-3 continue oral coverage. Single-day use alone is insufficient for full protection.[1][2]
Adjustments for Moderately Emetogenic Chemo
For less nausea-prone regimens (e.g., cyclophosphamide), a single 125 mg capsule on day 1 suffices, often with other antiemetics. Always follow oncologist's plan based on chemo type.[1]
Pediatric Dosing
Kids 6 months+ weighing under 40 kg get weight-based IV fosaprepitant (often day 1 only); over 40 kg match adult oral schedule of three 125 mg capsules.[1]
Common Regimens Patients Search
| Chemo Type | Capsules Needed | Timing |
|------------|-----------------|--------|
| Highly emetogenic (e.g., cisplatin ≥50 mg/m²) | 3 (125 mg each) | Day 1 (pre-chemo), Day 2, Day 3 |
| Moderately emetogenic (e.g., carboplatin AUC ≥4) | 1 (125 mg) | Day 1 only |
| With radiation | Varies; often 1-3 capsules | Per protocol[1][2] |
What If I Miss a Dose?
Take the missed capsule as soon as possible on that day unless it's day 1 post-chemo. Skipping doesn't require restarting; consult your doctor to avoid nausea breakthrough.[1]
Side Effects and Drug Interactions
Fatigue, diarrhea, or hiccups occur in 10-20% of users. Emend interacts with warfarin, oral contraceptives, and CYP3A4 drugs—inhibits them for days after dosing.[1][2]
Alternatives if Capsules Aren't Tolerated
IV Aprepitant (Emend for Injection) on day 1 replaces the first capsule for poor swallowers. Cheaper generics available since patent expiry.[1][3]
[1]: Emend Prescribing Information (Merck)
[2]: NCCN Antiemesis Guidelines v2.2023
[3]: DrugPatentWatch: Aprepitant Patents