The homeopathic medicines are derived from following sources:
Plant Kingdom: Herbs and plants are from plant kingdom such as Belladonna atropa (Deadly Nightshade) , Calendula Off (Marigold), Arnica Montana (Leopards bane), Crocus Sativa (Meadow saffron)
Mineral Kingdom: Most of the elements and compounds like metals, salts, alkali, and acids are from mineral kingdom such asSulphur, Calcarea Carb (Calcium Carbonate) , Nitric-Acid, Natrum-Muriaticum (Common Salt)
Animal Kingdom: Drosera, Rumex, Lac Defloratum, Oleum Jecrosis, etc
There are other 4 classes of homeopathic medicine-Nosodes, Sarcodes, Impondarablia, Tautopathic.
Homeopathy has a unique approach to the method of preparation of the drugs (called potentisation) in which the end result will contain only the 'dynamic curative power' of the drug substance/concentrated ingredient. This ensures that homeopathic remedies with its nano dose are non-toxic, absolutely safe, and bring about cure. Homeopathic dilutions are dispensed in medicinal alcohol. The tablets, pills, globules, or powder are non-medicinal and are used as a medium to administer the homeopathic medicines.
Homeopathic medicines are available for a wide range of conditions, from acute to chronic (longstanding). Homeopathic medicine is chosen on the basis of wholistic approach (totality of physical, metal and emotional symptoms of patient) which treats different complaints of the same person.
For how long one has to take homeopathic medicines depends on the illness as well as the other individual characteristics of your case. In general, a slowly developing or long-standing complaint takes longer to cure than an acute one. Most of the times what happens is the patient come to us with long history of chronic illness. Therefore the treatment takes time. Homoeopathy is in fact fast acting in acute conditions such as fever, diarrhea, vomiting, etc.
Homeopath Physicians do not wait for a disease to progress to an observable level by tests/machines. They observe the objective and subjective symptoms. Constitutional medicine is the best preventive medicine in Homeopathy. As times it has been seen that a specific medicine for example Euphrasia taken for conjunctivitis precipitates the illness rather than stimulating the illness. Eupatorium Perfoliatum is one specific medicine for prevention of chiken gunya fever when taken during epidemic.