Pelargonium sidoides is also known as Umcka or Umckaloabo. It is an effective herbal extract that works against flu, sinusitis, colds, ear infections and tonsillitis. The Umcka herbal remedy is effective in relieving symptoms of bronchitis in adults, particularly those with cough and sputum production. Studies show that Umcka works best within 2 days from the onset of cold or flu.