The medicinal agents used by the siddhars could be classified into three groups:
- Thavaram (herbal product)
- Thadhu (inorganic substances)
- Uppu (water-soluble inorganic substances that give out vapour when put into fire)
- Pashanam (agents not dissolved in water but emit vapour when fired),
- Uparasam (similar to pashanam but differ in action)
- Loham (not dissolved in water but melt when fired)
- Rasam (substances which are soft)
- Ghandhagam (substances which are insoluble in water, like sulphur).
- Jangamam (animal products).
Siddha system connects both spiritual and physical and treats the person as a whole i.e. it concentrates on the physical, psychological, social and spiritual well-being of an individual.
The Siddha System is effective in treating chronic skin diseases like Psoriasis, Rheumatoid arthritis, Arthritis, Nerve & Muscle Diseases, Acne, Paralysis, Allergy, Asthma, Respiratory Diseases, Ovarian & Hormonal Disorders, Brain Development Disorders, Infertility, Diabetes, Obesity, Insomnia/Depression, Anaemia, Prostate enlargement, Piles and Peptic ulcer, etc.
The Siddha System also deals with the problems affecting women’s health. Once the girl child attains menarche, the Siddha System has got a variety of preparations that can strengthen her reproductive system so as to deliver a healthy child in the future. And also, effective treatments are available to take care of menopausal syndromes, especially problems related to hormonal imbalance.