Tirzepatide + B12
A weekly dual-action GLP-1/GIP injection for meaningful weight loss and appetite control, paired with vitamin B12 for energy.
Injection
from $208/mo
Taken by mouth · As needed
Digestive supportAnti-nauseaGI health
Ondansetron
Oral ondansetron, an anti-nausea medication used off-label to support digestive comfort during weight-loss treatments. Ondansetron blocks nausea signals in the gut and brain, making early weeks of weight loss more tolerable.
- FDA-approved anti-nausea medication
- Supports digestive comfort during weight loss
- Oral tablet, as-needed dosing
- Monthly$49/mo
- Free, discreet shipping
- Licensed U.S. pharmacy
- Board-certified physicians
Disclaimer: Prescription products require an online evaluation with a licensed medical professional who will determine if a prescription is appropriate. Products are compounded by a licensed pharmacy. The FDA has not reviewed or approved compounded products for any use for safety, efficacy, or quality. Compounded medications are not FDA-approved brand-name products.
- How
- Taken by mouth
- How often
- As needed
- Each shipment
- 30 tablets
- Strengths
- 2 options · 4–8 mg
What is Ondansetron?
(serotonin 5-HT3 antagonist)
Ondansetron is an FDA-approved anti-nausea medication (brand name Zofran). It works by blocking serotonin receptors in the gut and brain that trigger nausea. Off-label use with weight-loss medications like GLP-1 helps users tolerate the common early side effect of nausea.
What's in it
- OndansetronBlocks nausea signals
Support medication
FDA-approved for nausea; off-label support for weight-loss tolerance
Ondansetron is not a weight-loss drug. It is used to manage nausea that commonly occurs in the first 1–2 weeks of GLP-1 therapy or other weight-loss medications. Reducing nausea improves adherence to treatment.
Is it right for you?
Who it's for
People on a GLP-1 who get nausea when the dose goes up.
What sets it apart
It is not a weight-loss medicine. It blocks the nausea signal so you can stay on your treatment.
Worth knowing before you start
It can cause constipation, which GLP-1s already cause. Use it on the bad days, not every day.
What to expect
Nausea relief
works within 30 minutes; effects last 4–8 hours
Early support only
used for first 1–2 weeks, then usually stopped
Stays on track
by reducing nausea, it helps you continue your weight-loss plan
No weight-loss effect
ondansetron is purely supportive, not a weight-loss drug
How ondansetron support works
Day 1
Your physician prescribes ondansetron if nausea is expected (e.g., starting GLP-1). It can be taken daily or as-needed during the first 1–2 weeks.
1Week 1
Start your weight-loss medication. If nausea occurs, ondansetron provides relief within 30 minutes. Take it as directed.
2Weeks 2–3
Nausea usually diminishes as your body adjusts. You may still use ondansetron as-needed for any residual queasiness.
3Week 4+
Most people find they no longer need ondansetron. The medication is purely supportive; as GLP-1 nausea fades, it is discontinued.
4Beyond
Long-term: ondansetron is not used for ongoing weight loss; it was only for the early adjustment period. Your weight-loss plan continues without it.
5
Individual results vary. Benefits reflect what Zepym Health members commonly report to their physician at check-ins; they are not the results of a clinical trial.
How you use it
This is the starting dose the pharmacy prints on the label. Your physician sets yours and adjusts it with you.
- How
- Taken by mouth
- Dose
- 1 tablet (4 mg)
- How often
- As needed
- Each shipment
- 30 tablets
- Pharmacy label
- Take 1 tablet (4 mg) by mouth once daily as needed for nausea for 30 days.
Strengths the pharmacy carries
- 8 mg
- 4 mg
The science of anti-nausea support
Ondansetron is highly effective for chemotherapy-induced and post-operative nausea. GLP-1 users commonly experience nausea in weeks 1–2; ondansetron provides relief.
The medication does not affect weight loss itself; it simply makes the early weeks more tolerable by reducing nausea, allowing people to continue their treatment.
Learn moreImportant safety information and common side effects
Ondansetron is generally well-tolerated. Common mild side effects are headache, constipation, and fatigue. Rare serious effects include QT prolongation (heart rhythm changes) in very high doses, though this is uncommon at standard weight-loss-support doses. Do not use if you have a history of QT prolongation or certain heart arrhythmias. Tell your physician about all medications and heart conditions. Stop and seek care for severe headache, fainting, or irregular heartbeat.
Every plan includes
- Personalized, physician-guided plan
- Monthly plan
- Dispensed by a US-licensed compounding pharmacy
- Unlimited protocol adjustments and messaging
- Ongoing support and check-ins
- Pause or cancel anytime
- Reviewed by our in-house physicians
How it works
1.Connect with a physician
Answer a few questions online and a US-licensed physician reviews your health, history and goals to make sure treatment is right for you. 100% online. No in-person visit required.
2.Get your discreet shipment
If approved, your treatment is compounded by a US-licensed, LegitScript-certified pharmacy, inspected for quality, and shipped discreetly to your door.
3.Receive continuous support
Start with one goal, then keep building over time. Unlimited physician messaging, easy refills and dose adjustments, all from the Zepym Health app.
Ondansetron educational content reviewed by our physician
Scott Nass, MDDoctor of Medicine, board-certified in Family Medicine
Charles R. Drew University and David Geffen School of Medicine at UCLA. Family Medicine residency at Ventura County Medical Center.
Frequently asked questions
How do I take Ondansetron?
Taken by mouth, as needed. The starting prescription is 1 tablet (4 mg) each time. Your physician sets your own dose and it is printed on your label.
What strengths does Ondansetron come in?
The pharmacy carries 2: 4 mg, 8 mg. Your physician chooses which one you get.
How much arrives in each shipment?
30 tablets at the starting strength, shipped to your door from a licensed US pharmacy.
How does ondansetron help with weight loss?
It doesn't directly help with weight loss. Ondansetron reduces nausea, a common side effect of GLP-1 and other weight-loss medications. By managing nausea, it helps you tolerate the early weeks of treatment and stay on your plan.
Is ondansetron addictive?
No. Ondansetron is not addictive. It is a non-controlled anti-nausea medication. It is safe to use as-needed for nausea relief.
Do I have to take ondansetron?
No. It is optional. If you experience nausea during weight-loss treatment and want relief, your physician can prescribe it. If nausea is mild or absent, you may not need it.
How long do I take ondansetron?
Typically 1–2 weeks, as-needed. Most GLP-1 nausea fades after the first 2–3 weeks as your body adjusts. Once nausea stops, you discontinue ondansetron.
Can I take ondansetron with other medications?
Tell your physician about all medications. Ondansetron has few drug interactions, but some cardiac medications (QT-prolonging drugs) require caution. Your physician will screen for interactions.
Nausea management, short-term support.
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The above statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Prescription products require an online evaluation with a licensed medical professional who will determine if a prescription is appropriate. Individual results vary.
Sources
- 1
Ondansetron efficacy and safety for chemotherapy-induced and postoperative nausea.
Drugs, 2012 - 2
GLP-1 receptor agonists and nausea: mechanisms and management strategies.
Diabetes Care, 2023
Ondansetronfrom $49/mo