What is Zolgensma, world's most expensive drug that costs ₹18 cr a dose?

Life-changing drug 'Zolgensma', considered the world's most expensive drug with a reported list price of ₹18 crore per dose, was first approved for use by the US and recently by the UK. The one-time gene therapy is used to treat babies with a type of severe spinal muscular atrophy. The condition causes muscle weakness and affects movement and breathing.