Aconitum napellus is one of the most important acute remedies in homeopathy. It is primarily indicated in conditions that arise suddenly and violently, often after exposure to dry, cold winds, fright, or shock. The key feature is sudden onset with great anxiety, restlessness, and fear of death.

It is especially useful in the first stage of acute inflammations before pus formation sets in—such as in colds, fevers, pneumonia, croup, or ear infections.