Increased excise on pre-mixed spirits in Australia is expected to boost beer sales for Foster's and Lion Nathan.

The excise on spirit-based RTDs in the country was this week increased from A$39.36 (US$36.95) per litre of pure alcohol to A$66.67, which is expected to lead to a rise of up to 30% in shelf prices.

The federal government said the move was aimed at curbing binge drinking among teenagers.

Analysts said Diageo and Independent Distillers were likely to suffer the biggest downturn in sales, while the impact on Fosters' and Lion Nathan's RTD divisions would be offset by drinkers switching to beer.

Coca-Cola Amatil said its Pacific Beverages joint venture with SABMiller would rely on the strength of brands such as Jim Beam and Cola to weather "some inevitable short-term adjustments".

"The tax will not affect our overall long-term alcohol strategy or direction, as pre-mixed drinks, or RTDs, are just one part of our alcohol portfolio," a spokeswoman said.