Nux vomica is prepared from the strychnine-containing seeds of the Strychnine or Poison Nut tree. Once prepared in homeopathic potencies, the remedy is non-toxic and safe for use with infants through to the elderly. Those who need Nux vomica do things to excess. They overwork and overindulge in food, coffee, stimulants, and alcohol (it is a key remedy for hangover). They are competitive, driven, irritable, and intolerant of the shortcomings of others. Eventually, nervous exhaustion leads to sleep difficulties, and sensitivity to smells, light, and sound. Pains are cramping and spasmodic, and worsened by sedentary habits.