Yes it is curable in homoeopathy. Along with that your father have to do exercise for strengthing the muscle . There are several medicine which help to strengthen the muscles bt here if you ask then every one suggest medicine which help only one time and futher followup is not occur.
Permanent cure always need proper medicine with dietary management along with proper followup. So choose any physician and take treatment acc to that nothing added by yourself.
Next Steps
you can also book online appointment here also.
Health Tips
water intake should be more.
exercise is simple.. whenever he has urge to urine then hold for few sec and then release urine. during urination again try to hold urine for. few sec then again release. if during urination he has do that activity 3 to 4 times then gradually muscle become strengthen.
medicine are rhustox, causticum, gelsemium, alumina .