The Australian Medical Association says some pharmacies are offering flu vaccinations too early.

The health sector lobby has urged people to hold off on this year’s flu jab.

“We are concerned when pharmacies are out there advertising early flu shots at a time that might not be clinically appropriate,” AMA national president Michael Gannon said.

“People who are vaccinated too early in autumn might have lost protection by late in the spring when the virus has mutated.

“Doctors are working closely with the Health Department in Canberra on this year's seasonal vaccination program, trying to get the best possible value out of the huge investment and to protect as many vulnerable populations as possible.”

He said timing is important for the continued efficacy of the drugs.

“Remember why you need to have a vaccine every year is the influenza virus rapidly and quickly mutates. It will be appropriate for some patients to defer having their flu shot until well into April,” he said.