Herbal formulas act as both nutrients and drugs in the patient's body. Humans and animals have co-evolved with plants and have gastro-intestinal and detoxification systems more safely amenable to herbal treatment than most modern drugs. The average time to see a response with herbal formulas is 5 - 14 days. Very chronic diseases may take longer, especially if multiple problems are being addressed. As your pet's condition changes, formulas may have to be adjusted to address underlying diseases that may have been hidden by the presenting complaints.