Many thanks for your very relevant comments, Quantum. It would be good to know this information, indeed.
Mushnikk, on the Poiscenter topic quoted earlier, does not seem to have experienced anejaculation with Silodosin, only "reduced semen volume", with "a remission of symptoms (fatigue, brain fog)".
As for me, I believe that I can testify that I didn't have the usual Pois (especially the overwhelming fatigue) after a deliberately aborted orgasm (without medication), though I don't know if it was a case of anejaculation or retrograde ejaculation. It may have occurred more than once, when I didn't know "POIS" yet, so I don't remember.