Australia's expert vaccination panel may soon tick off on a major expansion to the country's coronavirus vaccination program, paving the way for third doses to be administered.

Yesterday, the medicines regulator the TGA approved Pfizer for use as a third dose - sometimes referred to as a booster - for Australians aged 18 or over after six months after their second dose.

But despite the third dose boosting immunity, the Federal Government says they won't require it to be considered fully vaccinated.

Also on today's show:

* How does the TGA and ATAGI work in approving and recommending vaccines?

* Why only 18 years or over?

* Can I go get it a bit early?

* What about side effects?