Magic bullet means: Sometimes, a silver bullet is the magic bullet. 1. This drug is the perfect one to treat a specific disease without side effects. Paul Ehrlich, a German scientist, first coined the term “magic bullet” to refer to antibody. Later, salvarsan, a drug he developed to combat syphilis, was also used.
2. There is a magic solution for every vexing problem.
(in Medical Dictionary)

What else does Magic bullet mean?

A magical cure or solution is something that can be regarded.
(in Merlin Dictionary)