Aconite: in spasmodic cases, also in asthma consequent on nasal catarrh in children.
Alcohol: in combination with amyl nitrite in spasmodic asthma.
Alkalies: in chronic bronchial catarrh.
Allyl Tribromide.
Alum: 10 grn. of dry powdered alum put on the tongue may arrest a spasm.
Ammonia Vapor.
Ammoniacum: like Asafetida.
Ammonium Benzoate.
Amyl Nitrite: sometimes checks paroxysm in spasmodic asthma and dyspnea due to cardiac hypertrophy. Must not be given in chronic bronchitis and emphysema.
Anemonin.