Priya Anand is a urologist who long ago made peace with the fact that her most useful work often happens in slightly awkward conversations. Erectile dysfunction and hair loss are common, treatable, and still wrapped in embarrassment, and she has spent her career making these subjects ordinary so that people get seen rather than quietly giving up.
In the forum threads her habit is to find the one fact that actually matters in each question and lead with it. Across the whole PDE5 family the non-negotiable is nitrates, and she says so plainly every time it is relevant. With finasteride she is honest about the trade-offs and the slow timeline, because managing expectations is half the treatment.
She covers the three erection medicines plus finasteride here, and she compares them without favourites, because the best drug is the one that fits your body and your life. As with everything on the site, her answers are general education from a doctor, not a treatment plan for you.