Out of the multiple vaccines available, how is one or more vaccine chosen for administration?

The safety and efficacy data from clinical trials of vaccine candidates are examined by Drug regulator of our country before granting the license for the same. Hence, all the COVID-19

vaccines that receive license will have comparable safety and efficacy. However, it must be ensured that the entire schedule of vaccination is completed by only one type of vaccine as different COVID-19 vaccines are not interchangeable.