Bronchostop Cough pastilles are traditionally used to relieve any cough: dry, tickly, chesty, mucus or catarrh. On-the-go pastille format. Buttercup Bronchostop Cough Pastilles contain thyme herb extract. A traditional herbal medicinal product for use in the relief of coughs, such as chesty coughs and dry, tickly, irritating coughs and catarrh, exclusively based upon long-standing use as a traditional remedy. Always read the leaflet. Voted 2016 Product of the Year Award by consumers themselves.