In homeopathic repertorisation, eliminating symptoms are those symptoms which helps to exclude all the medicines that are not needed for the patient and bring only those medicines that are required for the patient.

There are two methods of elimination:
1. Single-step elimination: The elimination of the medicine is done only once, at the beginning of the exercise. The most prominently characteristic symptom is selected as the eliminating symptom. The medicines indicated for this are noted down. For the next rubric/symptom, only these medicines that are common to the eliminating symptom are considered.
2. Cascading elimination: In this method, elimination is carried out throughout the whole process. Each symptom becomes the eliminating symptom for the next symptom. Extreme caution and care should be taken in structuring the hierarchy of symptoms.

The eliminating symptom is very important in the exercise of repertorisation because it dictates and determines the medicines that compete for the mantle of the similimum. It acts as a safe shortcut to the prescription in the hands of an experienced physician. If you can get such marked eliminating symptoms to begin with, you will see what a lively small number of drugs you have to carry down through all, the rubrics, and how much easier and quicker it is to get your remedy.

For example, if a patient complains of dyspepsia with burning pain in the stomach and frequent vomiting of sour fluid, and you find that he cannot stand the heat – whatever his stomach may do – that he is ill if long out in the sun, prefers cold weather and a cold climate, never goes near the fire, etc., these can be considered as eliminating symptoms. You know at once, whatever his stomach condition may be, with that temperament, that warm personality, it would be useless for deep and curative work to think of giving him Arsenicum, Phosphorus, Nux, or Sepia. He is a hot patient, and these are predominantly cold remedies. You can strike them out at once.