magic bullet

noun

1. something that cures or remedies without causing harmful side effects: So far there is no magic bullet for economic woes.

noun

1. informal any therapeutic agent, esp one in the early stages of development, reputed to be very effective in treating a condition, such as a malignant tumour, by specifically targeting the diseased tissue

n.

1. A drug, therapy, or preventive therapy that cures or prevents a disease.