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Alkaloids are chemical compounds that can be made naturally. They contain basic nitrogen atoms. The name comes from the word alkaline and was used to describe any alkaline containing nitrogen. Alkaloids are made by a large variety of organisms, such as bacteria, fungi, plants, and animals and are part of the group of natural products (also called secondary metabolites). Many alkaloids can be from basic substances by acid-base extraction. Many alkaloids are toxic to other organisms. Some alkaloids have a bitter taste.
- Cocaine, used as an anesthetic and a stimulant, is an illegal drug when it is not used medically.
- Caffeine, used as a stimulant, is used as something addictive in coffee or tea. In this case and the following, herbivores can eat the leaves but they get heart palpitations if they eat too many.
- Nicotine, used as a stimulant in cigarettes, can also be used to treat certain forms of epilepsy.
- Morphine is widely used to subdue severe pain. In a special slow-release form, it is sometimes used to help people get away drug addiction.
- Quinine, used to treat certain forms of malaria, is sometimes used to give food a bitter taste.
- Curare, the poison dart substance, is originally a plant product from Strychnos toxifera, which is later concentrated in poison dart frogs.
- Strychnine and brucine are toxic alkaloids produced by Strychnos nux-vomica. This is a close relative of S. toxifera.