<prompt> Drug used in ameliorative test for myasthenia gravis is:PhysostigmineEdrophoniumTacrinePyridostigmine  <response>: Ans. B EdrophoniumRef: KDT 8the p121Drug used in ameliorative test tensilon test for myasthenia gravis is edrophonium. It is a cholinergic drug and can be used for diagnosis of myasthenia gravis because of its short duration of action 10 - 30 min. 