India dispatched consignments of SII's Covishield to Myanmar, Seychelles and Mauritius.
India is sending Covid-19 vaccines as part of donation program to neighbours and key partners.
Bhutan, Maldives, Bangladesh, Nepal were also part of India's initial rollout of vaccines.
In addition, India plans to supply vaccine doses to Afghanistan and Sri Lanka.
Covishield's commercial supplies to countries having agreements with SII have also begun.
Two flights are slated to carry two million doses each to Brazil and Morocco on Friday.
India is carrying out vaccine diplomacy under its 'Neighbourhood First' policy.
Last week, India launched the world's biggest Covid-19 vaccination drive across the country.