<prompt> Drug used for ameliorative test for Myasthenia gravis isEdrophoniumPhysostigmineTacrinePyridostigmine  <response>: KDT 6e p 104 Drug used in ameliorative testtensilon test for Myasthenia gravis is edrophonium. it is a cholinergic drug and can be used for diagnosis of Myasthenia gravis because of a sho duration of action10-30 min 