I found this on a homoeopathic site: For sudden onset of illness, such as colds, when the body is cold, but the face is hot, short, dry cough, thirst. Can be a sore throat. For ailments that are brought on after being exposed to cold wind. . Also a very useful remedy for shock, fear and anxiety, especially with restlessness; first stages of croup; earache when the ear is red, hot and painful; sudden onset of fever; insomnia with fear or anxiety.