All adults over the age of 18 will be offered a coronavirus jab starting from 1 May, the government said on Monday.
However, with vaccines in short supply in many states, it is unclear where the additional doses will come from.
The government said last week that it only had 27 million doses - or enough jabs for nine days at current rates of vaccination.
India is currently vaccinating health workers, front line workers and people over 45, but a number of states - including the worst-affected Maharashtra state - have reported insufficient supply. There have been reports of people being turned away from vaccination centres in many areas.
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