From Boericke's materia medica:

(Iodide of Ammonia) Indicated when iodine has but partially relieved its cases of laryngitis and bronchitis, catarrhal pneumonia, oedema of lungs. 

Head
Dull headache, especially in young people, face stupid, heavy; vertigo, Meniere's disease. 

Dose
Second and third trit. Compare: AMMONIUM TARTARICUM (Dry hacking cough after every cold).