New menopause drug:- 5.3 Preclinical safety data Effects in non-clinical studies were observed only at exposures considered sufficiently in excess of the maximum human exposure indicating little relevance to clinical use. Repeated dose toxicity Repeated administration of fezolinetant to rats and monkeys showed the effects consistent with the primary pharmacological action (oestrous cycle disruptions, the lack of ovarian activity, decreased uterine and/or ovarian weight, uterine atrophy). These effects were observed at high exposure levels (> 10-fold of the anticipated clinical exposure at the human therapeutic dose of 45 mg). Furthermore, in rats, secondary effects were seen on the liver and thyroid which are considered to be an adaptive response to the enzyme induction and in the absence of functional impairment and accompanying necrotic changes were considered non-adverse. The finding of thyroid follicular cell hyperplasia is considered secondary to the liver enzyme induction due to the increased thyroid hormone metabolism, resulting in the positive feedback to the pituitary for the stimulation of thyroid stimulating hormone production and increased thyroid activity. It is generally accepted that rodents are more sensitive to this type of liver-mediated thyroid toxicity than humans, thus these findings are not expected to be clinically relevant. In monkeys, thrombocytopenia, sometimes associated with haemorrhagic episodes and regenerative anaemia, was seen following repeated administration at high dose levels (> 60-fold of human exposure at the human therapeutic dose). Genotoxicity Fezolinetant and its major metabolite ES259564 showed no genotoxic potential in the in vitro bacterial reverse mutation test, in vitro chromosomal aberration test, and in vivo micronucleus test. Carcinogenicity An increase in the incidence of thyroid follicular cell adenoma was noted in a 2-year rat carcinogenicity study (186-fold of human exposure at the human therapeutic dose). The increase is considered to be a rat specific effect secondary to the induction of hepatocyte metabolic enzymes and does not constitute a clinical carcinogenic risk. Additionally, increased incidence of thymomas, which slightly exceeded the historical control range, was observed in both species. However, these findings were only noted at exposure levels significantly in excess (> 50-fold) of the clinical exposure at the human therapeutic dose, and therefore are not expected to be relevant to humans. 😔 Veoza, INN-fezolinetant
European Union
https://ec.europa.eu › health › anx_160974_en
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Breast-feeding Veoza is not indicated during lactation. It is unknown whether fezolinetant and its metabolites are excreted in human milk.
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