Boiron Belladonna. Belladonna is a natural homeopathic remedy formulated to provide relief from fever, flu, tonsillitis, sore throat, dry tickly cough worsened by speech, earache, throbbing pain, and sudden onset of flushed skin with cold extremities. Belladonna also relieves intense headaches, abdominal pain, toothache, inflammation of kidneys, pinkeye, heat stroke, and nose bleeds. For women, this remedy treats breast infections, menstrual cramps, and irritated nipples due to breast feeding.