In the study of Homoeopathic Philosophy, one of the most fundamental concepts explained by Samuel Hahnemann in the Organon of Medicine is the doctrine of Primary and Secondary Action. These aphorisms (63–69) form the physiological and philosophical foundation of how medicines act upon the human organism.
Understanding this concept is essential not only for BHMS examinations but also for developing clarity in practical prescribing.
In Aphorisms 63–69, Hahnemann explains how medicines act on the human organism through:
- Primary Action
- Secondary Action
These actions occur due to interaction between the medicine and the vital force.
What is Primary Action?
Definition
Primary action is the initial effect produced by a medicine on the healthy human organism.
Primary action is the initial effect produced by a medicine upon the living organism. When a medicinal substance is introduced into the body, it disturbs the vital force and alters the state of health for a certain period of time.
Although both the medicine and the vital force participate in this process, Hahnemann clearly states that the primary action is chiefly the effect of the medicine itself. During this stage, the vital force behaves in a passive or receptive manner. It allows the medicinal influence to act upon it.
For example, when a person drinks strong coffee, he may experience excessive alertness and excitement. When opium is taken, it produces deep stupefied sleep. When a hand is immersed in hot water, it becomes warm. These are all instances of primary action.
In short, primary action is the direct medicinal effect on the organism.
Explanation
- Every medicine deranges the vital force.
- It alters the state of health for a shorter or longer duration.
- Though both medicine and vital force are involved, it is chiefly the effect of the medicine.
- During this stage, the vital force remains passive or receptive.
Example
- Opium causes deep sleep.
- Coffee causes excitement.
- Hot water makes the hand warm.
What is Secondary Action?
Definition
Secondary action is the reaction of the vital force against the primary action of the medicine.
It is:
- Automatic
- Oppositional
- A self-preserving response of the vital force
Secondary action is the reaction of the vital force against the primary action of the medicine. After being influenced by the medicine, the vital force does not remain passive. It attempts to restore balance and re-establish normal health.
This reaction is automatic and arises from the self-preserving nature of the vital force. It represents the organism’s effort to counteract or overcome the disturbance caused by the medicine.
Secondary action may appear in two forms:
- Opposite reaction (counter-action)
- Curative reaction (in homoeopathy)
Secondary Counter-Action: The Opposite Reaction
In many cases, the secondary action manifests as an opposite state to the primary action.
If a person becomes heated due to violent exercise (primary action), he may later experience chilliness and shivering (secondary action). After the profound sleep caused by opium, sleeplessness may follow the next night. After the excitement produced by coffee, sluggishness and drowsiness may remain for a long time.
Similarly, if a hand is kept in very cold water, it first becomes pale and cold (primary action), but after removal and drying, it becomes red, hot, and inflamed (secondary action).
This phenomenon explains why antipathic or palliative treatment provides only temporary relief. When a medicine produces effects opposite to disease symptoms, it may suppress them briefly. However, once its action ceases, the vital force reacts strongly in the opposite direction, often making the original symptoms worse.
Thus, palliation is temporary and ultimately aggravating.
Secondary Curative Action: The Basis of Homoeopathic Cure
The most important aspect of this doctrine is the secondary curative action seen in homoeopathy.
When a minute dose of a medicine is given that is similar to the existing disease, it produces a slight artificial disease (primary action). Because this medicinal disease is similar and slightly stronger than the natural disease, it extinguishes the natural disease according to the law stated in Aphorism 26: the stronger similar artificial disease removes the weaker natural one.
After the natural disease is removed, only a small medicinal disease remains. Since the dose is minute and potentized, this artificial disease is short-lived. The vital force easily overcomes it through its secondary action.
The result is restoration of health.
This is not suppression. This is not opposition. It is a natural and permanent cure based on the law of similars.
Suspended Animation: An Exceptional Situation
Hahnemann was strongly opposed to palliative treatment. However, in the footnote to Aphorism 67, he modified his stance in certain exceptional circumstances.
In cases of suspended animation—where a previously healthy person is in sudden danger of life and there is no time for the action of a homoeopathic remedy—temporary palliative measures may be justified.
These situations are extremely urgent, sudden, and life-threatening. In such cases, stimulation of irritability and sensibility may be necessary as a preliminary measure.
This shows Hahnemann’s practical wisdom and humanitarian outlook.
Primary action is the direct disturbance caused by the medicine. Secondary action is the organism’s attempt to restore balance. When medicines are used antipathically, the secondary action aggravates the disease. When used homoeopathically in minute doses, the secondary action becomes curative and restores health permanently.
Thus, Aphorisms 63–69 of the Organon provide one of the most profound insights into the dynamics of healing in homoeopathy.