There is no set treatment for hydrophobia in homoeopathy.The patient should be rushed to the hospital.
The developed disease requires first of all "the removal of every cause of excitement";the separation of the patient from everything calculated to disturb or render him anxious;the maintenance of the utmost quiet;the employment of a friendly tone of address(in place of coercive measures);And the endeavour to calm the sufferer by kind treatment.
The following medicines can be tried till patient is hospitalised.

Symptoms/Problems Remedy Frequency(Doses)
Congested face;wild staring look,pupil dilated;sensitive to sunlight or shining objects;throst sore,spasm of throat,hoarse,barking voice;inability to swallow;oppression;anxiety,hallucinations;biting and snapping;convulsions Belladonna 30 or 200 1/2 hourly
When swallowing is prevented by inflammation;and not only from spasms of the throat;spasms follow the pain caused by swallowing;also when there is priapismus Cantharis 200 or 1M 10 min(3)
When the skin becomes bluished red,with edges hard and swollen.Fear of water Hydrophobinum 200 or 1M 10 min(3)
General convulsions more prominent than spasms of the throat;abuses those around.Sleep is interrupted as if by a sudden fright followed by convulsions Hyoscyamus 200 or 1M 10 min(3)
Fear of imaginary objects;and the great mobility and restlessness;with screaming and fear of dark Stramonium 200 or 1M 10 min(3)
In the worse state of developed disease Lachesis 200 or 1M 10 min(3)