The surprising connection between cromoglycate and amiodarone

Cromoglycate is a mast cell stabiliser administered by inhalation as a preventer in the prophylactic control of asthma. It is also used for prophylactic control of allergic rhinitis and allergic conjunctivitis. Amiodarone is a  class III antiarrhythmic agent, which prolongs repolarization of the cardiac action potential thus increasing the cardiac action potential duration.

Pharmacologically there is no obvious connection between cromoglycate and amiodarone. However, both drugs were first synthesised as derivatives of khellin the active ingredient obtained from plant extracts of khella (Ammi visnaga).