Dosing in homeopathy varies based upon a myriad of factors, most notably on whether your symptoms are chronic or acute.
Because I was experiencing acute respiratory symptoms from a recent exposure,that I had experienced the day after a spraying in my area, I took a water dose - several pilules (30C) in a 500ml bottle of distilled water from which I removed a tbsp and placed in a coffee cup of distilled water.
If symptoms abate, do nothing, the body has been stimulated to heal itself. If the symptoms get worse, I tend to try the same med in a different strength.
I am not a homeopathic physician, I do intensive studying and attend seminars for my own benefit and that of my family.