Such was Hahnemman's success, particularly with endemic and epidemic diseases, that Homoeopathy quickly spread throughout Europe and across to America. Dr Fredrick Harvey Foster Quinn introduced Homoeopathy into Great Britain in the late 1820's and in 1849 he founded the London Homoeopathic Hospital.

Homoeopathy was brought to America in 1825 and rapidly gained in popularity, partly due to the fact that the excesses of conventional medicine were especially extreme there, and partly due to the efforts of Constantine Hering. Hering developed the doctrine that symptoms always move in a particular way: from the surface to the interior, from the extremities to the upper part of the body, and from less vital to more vital organs. His "Laws of Cure" state that the cure must take place in the reverse order of the appearance of the symptoms (first in, last out).

Nearly as important as Hahnemann himself to the development and popularization of Homoeopathy was the American physician James Tyler Kent (1849 – 1921). His most important contribution may be his repertory, which is still widely used today.

Homoeopathy reached its peak of popularity in America in the decades 1865–1885. In the 1930s the popularity of Homoeopathy began to wane, especially in Europe and the United States, partly due to advances in biology and conventional medicine, partly due to a decline in coherence in the Homoeopathic community and partly due to increasing influence of AMA on medical practice. Homoeopathy experienced a renaissance in the 1970s that continues to this day. George Vithoulkas, who studied in India, where the Homoeopathic tradition had remained strong, was instrumental in resurrecting Homoeopathy in Europe.

With advent of computer technology, the ease with which large symptom databases can be used has brought about profound changes in the way Homoeopathy is practised. Today a large number of Homoeopaths use personal computers to sift through hundreds of thousands of pages of provings and case studies. The Homoeopathic repertorisation software have made practicing Homoeopathy much more easier.

Growth of Homoeopathy in India

Homeopathy did not take much time to be introduced in India. As early as 1810. Some German Physicians and missionaries landed in Bengal and started distributing homeopathic remedies among the local inhabitants. By the middle of the nineteenth century, there were many amateur Homoeopaths among Indian Civil and Military Services personnel in Bengal.

A Book entitled 'Thirty-five Years in the East Adventures, Discoveries' etc. published in London in 1852, by Dr. John Martin Honigberger, gives a glimpse of the beginning of Homoeopathic practice in Lahore at the court of Maharaja Ranjit Sinh. Dr. Honigberger had learnt Homoeopathy from Hahnemann in Paris in 1835. In 1839 Hea came to India for the second time and took up the treatment of Maharaja Ranjit Singh and succeeded in his mission beyond expectations. Roundabout 1846, some Homoeopathic hospitals were started by Surgeon Samuel Brookling, a retired Medical Officer at Tanjaore and Puducotta in South India under the patronage of the Rajahs of those States. In November 1851 at Calcutta, the Homoeopathic Hospital and Free Dispensary was started under the patronage of Hon'ble Sir John Hunter Littler, Deputy Governor of Bengal and President of the Council of India; and Dr. Tonnere a French Allopath by education but converted to Homeopathy, was appointed the Physician-in-charge of the hospital.

The year 1867 is also memorable for the establishment of the Banaras Homoeopathic Hospital with shri Lokenath Moitra who was converted to Homeopathy by Babu Rajendra Lall Dutt, a Physician-in-charge.

In august 1869, a Homoeopathic charitable dispensary was opened at Allahabad by private subscriptions and Babu Priyanath Bose, layman practising Homoeopathy was put Incharge of the Institution. Thus, Homoeopathy spread throughout the length and breadth of India even at that early period. The year 1870 is another important landmark in the history of Homeopathy in India when His Highness, the Maharaja Bahadur of Jaypur sent for Dr. Salazar of Calcutta for the treatment of his cataract, which was successfully treated by the doctor with Homoeopathic medicines.

The first Homoeopathic Dispensary which has completed more than 100 years of public service was started by Chhatrapati Shahu Maharaj, then emperor of Kolhapur State. It will not be exagarration if we say, Raja Ranjitsingh of Punjab brought Homoeopathy in India, through Dr. honningberg for treatment of Royal family, then credit of starting first public Homoeopathic dispensary goes to Shri. Chhatrapati Shahu Maharaj who opened the doors of Homoeopathy for common man in 1898.

Towards the end of the nineteenth century, another great man with a broad imagination and outlook entered the field of Homoeopathy as a chemist and pharmacist. It was Mahesh Ch. Bhattacharya who was a pioneer in selling good quality of medicines at economical rates. He also compiled and published a pharmacopoeia in Bengali and English with whose help thousands have been able to enter the line.