Assuming secondary hypogonadism, then with few exceptions
enclomiphene will not restore or maintain fertility with any form of TRT that keeps serum testosterone at mid to high levels continuously. These forms of TRT include injections of testosterone esters, topical testosterone products and pellets. It has been demonstrated by
Maximus that at least one form of
oral testosterone is short-acting enough to be amenable to stimulation by
enclomiphene.
The reason why
enclomiphene is usually ineffective with TRT is because there is independent negative feedback by androgens at the hypothalamus. A SERM such as
enclomiphene only blocks negative feedback from estrogens.
If you want to try it anyway then you might be interested in my
speculation about cistanche, which perhaps would ameliorate the negative feedback by androgens.
The cons are primarily the hassle and expense. There's also uncertainty about the long-term effects of SERM/SARM use. It's not clear how selective these are for the target receptors in the HPTA. There's at least suspicion that
enclomiphene can dampen libido via effects on other brain areas.