Antagonist, agonist, mini-IVF — what the protocol names actually mean
A short, plain-language tour of the most common stimulation protocols and when each one is the right choice.
When your physician says 'antagonist protocol' they mean a stimulation cycle that uses GnRH antagonist injections to prevent premature ovulation. It is the most common modern protocol because it is short, has a low risk of OHSS, and works well for most patients.
An 'agonist protocol' (sometimes called 'long Lupron') uses a different class of drug to first suppress and then stimulate. It is older, longer, and now used in specific cases where the physician wants very tight control over the cycle.
'Mini-IVF' or minimal-stimulation IVF uses oral medications and very low-dose injectables to retrieve a smaller number of eggs. It is appropriate for some patients with diminished ovarian reserve, and for patients who specifically want a less medicated cycle.
There is no 'best' protocol in the abstract — there is only the best protocol for your physiology, your history, and the cycle you are trying to run. The right answer should always be explained, not just prescribed.