<unk>  is a vasodilator.<unk>  was found to depress the tonicity of coronary vessels, improve myocardial metabolism (so that heart can sustain hypoxia better) and also exert a positive chronotropic and inotrophic effects, thereby not precipitating angina pectoris. The latter property (positive chronotropic and inotrophic effects) is particularly important, because other vasodilators used in angina may be counter productive causing coronary steal phenomenon.
Synergestic effects with antibiotics have been suggested.
Oxyfedrine
Ritodrine
Midodrine
Gepefrine
Dimetofrine
Etilefrine
Chloroxylenol
Dipivefrine