The Pepsi Flavours concept draws on the experience of coffee shops, where consumers can order a standard drink flavoured with a shot of syrup. It will be trialled in 32 licensed premises across the UK over three months.
The flavours available include Apple, Vanilla, Cherry, Winter Spice and Tropical.
A spokeswoman said: 'Pepsi Flavours is the latest example of our work in on-premise innovation.'
She added that there were no plans to launch the flavoured variants into the off-trade.