Adverse reactions : תופעות לוואי

4.8         Undesirable effects

Summary of the safety profile

The most frequent adverse reactions with fezolinetant 45 mg were diarrhoea (3.2%) and insomnia (3.0%).

There were no serious adverse reactions reported at an incidence greater than 1% across the total study population. On fezolinetant 45 mg, four serious adverse reactions were reported. The most serious adverse reaction was an event of endometrial adenocarcinoma (0.1%).

The most frequent adverse reactions leading to dose discontinuation with fezolinetant 45 mg were alanine aminotransferase (ALT) increased (0.3%) and insomnia (0.2%).
Tabulated list of adverse reactions

The safety of fezolinetant has been studied in 2203 women with VMS associated with menopause receiving fezolinetant once daily in phase 3 clinical studies.

Adverse reactions observed during clinical studies are listed below by frequency category in each system organ class. Frequency categories are defined as follows: very common (≥1/10); common (≥1/100 to <1/10); uncommon (≥1/1 000 to <1/100); rare (≥1/10 000 to <1/1 000); very rare (<1/10 000); and not known (cannot be estimated from the available data).

Table 1. Adverse reactions for fezolinetant 45 mg
MedDRA system organ class            Frequency
Adverse reaction
(SOC)                         category

Psychiatric disorders            Common                Insomnia
Gastrointestinal disorders       Common                Diarrhoea, Abdominal pain 
Alanine aminotransferase (ALT) increased,
Investigations                   Common
Aspartate aminotransferase (AST) increased

Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorization of the medicinal product is important.
It allows continued monitoring of the benefit/risk balance of the medicinal product.
Any suspected adverse events should be reported to the Ministry of Health according to the National Regulation by using an online form https://sideeffects.health.gov.il.