Acute encephalitis syndrome is a person of any age, with acute onset of fever and a change in mental status including symptoms such as confusion, disorientation, or inability to talk and or new onset of seizures excluding febrile convulsions at any time of year. It's very painful condition of the medical fraternity to overcome from this situation. The alternative therapy like Homoeopathy may play a vital role to minimise the sufferings.

The ideal of any Homoeopathic Pharmacopoeia is to give to the manufacturer specific directions with respect to identification, collection, preparation, preservation of the source material and the finished product and ensure the physician the availability of a standard drug material. Here is mentioned the history of development of homoeopathic pharmacopoeia and content of HPI.