Nux Vomica, commonly known by the same name is the dried ripe seeds of the plant Strychnos Nux-vomica. It is part of the Loganiaceæ family.

Synonyms – Poison nut, Semen strychni

Habitat – India, Burma, Ceylon

Uses – A powerful spinal nerve tonic and highly poisonous. Nux Vomica is employed as a source of the alkaloid strychnine and in the form of galenical preparations - medicines comprised of natural rather than synthetic materials. Strychnine is the main active chemical in Nux Vomica. As its name suggests, It is particularly noted for its stimulative affect upon the gastro-intestinal tract.

Characteristics – No odour with an extremely bitter taste. The seeds are disc shaped and nearly flat, sometimes irregularly bent. They are ash-grey or greenish-grey, from two to two and a half centimetres in diameter and about six millimetres thick. The surfaces are densely covered with short, satiny and closely appressed hairs.