The word stimulant is used to refer to therapeutic agents - including natural substances such as herbs, oils, or essences, or conventional pharmaceutical drugs, that promote (increase) the activity of a system of the body, or a function of the body.
For example, caffeine, as contained in standard, as opposed to de-caffeinated, coffee and other soft drinks, is a stimulant of the central nervous system.
Tip: When studying agents that are stimulants, be sure to memorise the body system/function that they act on.
A more general way to define the word stimulant is to describe it as the property of therapeutic agents that quicken specific physiological function/s of the body.
The definitions in this section are of words used to refer to the actions (effects) of both pharmaceutical drugs and natural remedies. For information about specific oils, herbs, and remedies that might have properties including some of the actions mentioned in this section, see other parts of this website. For example, the pages about Aromatherapy Essential Oils, Bach Flower Remedies, Herbalism, Homeopathic Remedies, Homeopathy and Massage Carrier Oils.