Standard Dosing Schedule for Emend (Aprepitant)
Emend, used to prevent nausea and vomiting from chemotherapy, follows a 3-day oral regimen. Take the first 125 mg dose 1 hour before chemotherapy starts on Day 1. Follow with 80 mg once daily in the morning on Days 2 and 3, ideally at the same time each day.[1][2]
For single-day chemo, some protocols limit it to Day 1 only, but confirm with your oncologist.
How to Take It Exactly
Swallow capsules whole with water, with or without food—timing matters more than meals. Avoid grapefruit juice, as it raises aprepitant levels and risks side effects.[1][3]
If using the IV form (Emend for Injection), it's given over 30 minutes starting 30 minutes before chemo.[2]
What If I'm Using It for Other Reasons?
Emend is FDA-approved mainly for chemo-induced nausea (CINV), often with ondansetron and dexamethasone. It's not standard for post-op nausea (use the single 40 mg dose 3 hours before surgery) or general nausea—check with your doctor.[1][2]
Common Timing Mistakes to Avoid
Don't start late on Day 1; it reduces effectiveness. Missing doses drops protection by up to 50% in studies.[3] No need to double up—stick to the schedule.
Side Effects Tied to Timing
Fatigue or hiccups peak if doses overlap with chemo peaks. Liver enzyme changes are rare but monitored via blood tests.[1]
[1]: Emend Prescribing Information (Merck)
[2]: FDA Label for Aprepitant
[3]: Medscape - Aprepitant Dosing