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Drosera rotundiflora (sundew plant)
Drosera was the main remedy Hahnemann used for whooping cough . Indeed a dry, barking, croupy cough responds well to Drosera. There is an oppression in the chest and the pain is only relieved by exerting great pressure on the chest with both hands. The bouts of coughing occur close to each other so that the person hardly has the time to take a breath. At the end of such an attack, there is often vomiting. The cough is worse after midnight , worse when lying down, and worse from the heat of the bed.      

Drosera also helps to relieve speaker's sore throat (as do Rhus tox. and Arnica).