Boiron Aconitum Napellus. Aconitum Napellus is a natural homeopathic remedy formulated to relieve restlessness, acute sudden onset of infection, inflammatory fevers, and numbness. This remedy is good for those who exhibit fear and anxiety, especially after acute emotional trauma. Aconitum napellus is often used for the common cold, croup, fever, eye injuries, and earache.