Decontaminate patient!
Liquid phosgene can cause off-gassing with release of toxin from clothes post-exposure
Do not allow patient to be active as it worsens condition
Inhaled beta agonists for bronchoconstriction
Diuretics and corticosteroids not shown to be effective
Liquid phosgene can cause off-gassing with release of toxin from clothes post-exposure
Pulmonary chemical agents
Blister chemical agents 
Environmental exposure antibiotics
Lewisite 
High altitude medicine
Sulfur mustard 
Upper respiratory infection
Phosgene oxime 