Veoza Side Effects: Complete Safety Guide
When Do Side Effects Start? How Long Do They Last? Timeline, Contraindications & Food Interactions
Key Takeaways: Veoza Side Effects
- Common side effects: Diarrhoea, insomnia, abdominal pain, and increased liver enzymes (ALT/AST) affect up to 1 in 10 women.
- Onset: Most side effects appear within the first few days to weeks of starting treatment.
- Duration: Mild side effects usually resolve within days to weeks as the body adjusts; liver enzyme elevations are typically asymptomatic and monitored by your doctor.
- Contraindications: Do not take Veoza if you are pregnant, breastfeeding, allergic to fezolinetant, or taking strong/moderate CYP1A2 inhibitors.
- Food interactions: None – Veoza can be taken with or without food.
- Seek help: Immediately contact your doctor if you experience signs of liver injury (yellow skin/eyes, dark urine, fatigue) or an allergic reaction (swelling, rash, difficulty breathing).
Veoza (fezolinetant) is generally well tolerated, but like all medicines, it can cause side effects in some women. Understanding what to expect, when side effects typically start, how long they last, and which women should avoid this medicine helps ensure safe and effective treatment.
Important Safety Information
Seek immediate medical attention if you develop any signs of a serious allergic reaction (swelling of the face, lips, tongue or throat, difficulty breathing, severe rash) or liver injury (unexplained fatigue, loss of appetite, yellowing of the skin or eyes, dark urine). Do not take Veoza if you are pregnant, breastfeeding, or taking strong or moderate CYP1A2 inhibitors (see Contraindications).
Common Side Effects of Veoza
In clinical trials and from post‑marketing experience, the following side effects were reported in at least 1 in 100 women (common). They are generally mild to moderate and often resolve without stopping treatment.
| Side Effect | Frequency | Description |
|---|---|---|
| Diarrhoea | Common (≥1/100 to <1/10) | Loose or watery stools, usually mild and transient. |
| Insomnia | Common | Difficulty falling or staying asleep; may be related to the medicine's action on the central nervous system. |
| Abdominal pain | Common | Stomach discomfort, cramping, or pain; often resolves with continued use. |
| Increased ALT/AST (liver enzymes) | Common | Detected in blood tests; usually asymptomatic. Your doctor may monitor these levels periodically. |
Other side effects may occur but are less common. If you experience any unusual symptoms, report them to your doctor or pharmacist.
When Do Veoza Side Effects Start?
Most side effects associated with Veoza appear within the first few days to weeks of starting treatment. Because the drug reaches steady state in 5–7 days, any early symptoms (e.g., diarrhoea, abdominal discomfort) often manifest during this initial period. Liver enzyme elevations are typically detected on routine blood tests performed around 4 weeks after initiation, though they can occur earlier.
If side effects appear later in treatment, they are usually mild and may be related to other factors. It is important to report any new or worsening symptoms to your healthcare provider.
How Long Do Veoza Side Effects Last?
The duration of side effects varies by individual and by the type of side effect:
- Diarrhoea, abdominal pain, insomnia: These often resolve within days to a few weeks as the body adjusts to the medication. If they persist or become bothersome, your doctor may recommend taking the tablet with food (for gastrointestinal symptoms) or switching to morning dosing (for insomnia).
- Elevated liver enzymes: Usually asymptomatic and may return to normal with continued treatment or after dose adjustment. In rare cases, if levels become significantly elevated, your doctor may discontinue Veoza. Monitoring ensures safety.
After stopping Veoza, side effects generally resolve within a few days, consistent with the drug’s elimination half‑life of 8–10 hours.
Side Effects Timeline: From Start to Resolution
Week 1-2 (Onset)
Gastrointestinal side effects (diarrhoea, abdominal pain) and insomnia may appear. Liver enzymes may start to rise but are often undetectable without blood tests.
Week 2-4 (Peak)
Most common side effects peak during this period. Your doctor may check liver enzymes at around week 4.
Week 4-8 (Resolution)
Mild side effects often subside. If liver enzymes remain elevated but stable, treatment may continue with monitoring.
Long‑term
Most women tolerate Veoza well long‑term. If side effects persist or are severe, alternative treatments may be considered.
Contraindications: Who Should Not Take Veoza
Do not take Veoza if any of the following apply:
- Allergy: Hypersensitivity to fezolinetant or any of the excipients listed in section 6 of the Patient Information Leaflet.
- Strong or moderate CYP1A2 inhibitors: Concomitant use with medicines that significantly inhibit CYP1A2 is contraindicated because they can increase fezolinetant exposure by 2‑ to 10‑fold, raising the risk of side effects. Examples include:
- Fluvoxamine (antidepressant)
- Enoxacin (antibiotic)
- Mexiletine (antiarrhythmic)
- Ethinyl oestradiol‑containing contraceptives (combined oral contraceptives)
- Pregnancy: Veoza is not for use during pregnancy. Women of childbearing potential should use effective non‑hormonal contraception.
- Breastfeeding: It is unknown if fezolinetant passes into breast milk; breastfeeding is not recommended during treatment.
- Additional cautions (not absolute contraindications but require careful assessment):
- Pre‑existing liver disease – your doctor may monitor liver enzymes.
- Severe renal impairment – has not been studied.
- History of breast cancer or other oestrogen‑related cancers – safety not established.
- History of seizures – not studied.
- Concomitant hormone replacement therapy (HRT) – combination has not been studied.
Food Interactions and Considerations
Veoza can be taken with or without food. Clinical studies show that food does not significantly affect the absorption or overall exposure of fezolinetant. Therefore, there are no dietary restrictions related to the medicine.
However, taking Veoza with a light meal may help reduce gastrointestinal side effects such as abdominal pain or diarrhoea in some individuals. If you experience insomnia, taking the tablet in the morning rather than at night may be beneficial.
There are no known interactions with specific foods or beverages, including alcohol. Nevertheless, as with any medicine, it is wise to avoid excessive alcohol consumption, which can independently affect liver function and sleep quality.
When to Seek Medical Attention
While most side effects are mild and self‑limiting, you should contact your doctor immediately if you experience:
- Signs of liver injury: Unexplained fatigue, loss of appetite, yellowing of the skin or eyes (jaundice), dark urine, or upper abdominal pain.
- Allergic reaction: Rash, itching, swelling of the face, lips, tongue or throat, difficulty breathing, or severe dizziness.
- Persistent or severe side effects: Diarrhoea that leads to dehydration, abdominal pain that interferes with daily activities, or insomnia that significantly affects your quality of life.
If you have any concerns, do not hesitate to speak with your prescribing doctor or pharmacist. You can also report side effects directly to the MHRA via the Yellow Card Scheme (www.mhra.gov.uk/yellowcard).
Veoza FAQs
What are the most common side effects of Veoza?
The most common side effects (affecting up to 1 in 10 women) are diarrhoea, insomnia, abdominal pain, and elevated liver enzymes (ALT/AST) seen in blood tests.
How soon after starting Veoza do side effects appear?
Most side effects begin within the first few days to weeks of treatment, often during the first 2–4 weeks.
How long do Veoza side effects usually last?
Mild side effects like diarrhoea, abdominal pain, and insomnia often resolve within days to a few weeks as the body adjusts. Elevated liver enzymes are typically monitored and may stabilise with continued treatment.
Can I take Veoza with food to reduce side effects?
Yes, taking Veoza with food may help ease gastrointestinal side effects like abdominal pain or diarrhoea. The medicine can be taken with or without food, so choose what works best for you.
Is Veoza safe for women with liver disease?
Veoza should be used with caution in women with pre‑existing liver disease. Your doctor will likely monitor your liver enzymes before and during treatment. It is not recommended if you have severe liver impairment.
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Medical Content Manager
Nabeel is a co-founder and medical content manager of Chemist Doctor. He works closely with our medical team to ensure the information is accurate and up-to-date.
Medical Doctor
Dr. Feroz is a GMC-registered doctor and a medical reviewer at Chemist Doctor. He oversees acute condition and urgent care guidance.
Medical Director
Usman is a co-founder and medical director of Chemist Doctor. He leads the organisation's strategic vision, bridging clinical and operational priorities.
Review Date: 28 March 2026
Next Review: 28 September 2026
Published on: 28 March 2026
Last Updated: 28 March 2026