Contraindications of<unk> include hypersensitivity reactions among others. It is not recommended in people with autoimmune diseases due to lack of data in these individuals. Prolonged-release pharmaceutical<unk> (Circadin) contains lactose and should not be used in people with the lactase deficiency or glucose–galactose malabsorption. Use of<unk> is also not recommend in women who are pregnant or breastfeeding or in people with liver disease.
Melatonin 
Etoperidone
Sertindole
Tropisetron
Zolpidem
Cilansetron
Chloracyzine
Alosetron