MENTHODEX COUGH SYRUP 100ML s a cough syrup with expectorant properties for the relief of colds, sore throats, irritating and chesty coughs. Ingredient. Ammonium Chloride 200mg, Sodium Citrate 100mg, Menthol 15.5mg, Liquid Extract of Horehound 0.003ml, Squill Ticture 0.002ml, Tolu Tincture 0.002ml, Liquid extract of Tussilago 0.0008ml