Someone I know was advised angiography and angioplasty by a heart specialist. He went to another doctor- who tells there is no need of those, but has prescribed an ayurvedic medicine called “Myodrrops XL” along with some other medicines. Is this medicine an effective alternative to angiography and angioplasty?

No it’s not. NOTHING you ingest can remove the blockages. If there was, don’t you think that the drug would be widely sold & marketed?
angiography is a test which detedcts the blockages in the arterys angioplasty is putting a stent to open the blocked artery.