Yikes, this thread blew up. Seems some are skeptical of other people's experiences. That is why I mentioned we are all different. What happens to you isn't universal to everyone always. Sucks if you are experiencing sides at .25mg, that means you probably are hyper sensitive to it. Quite simply, different people have different sensitivity levels to meds. Effects how sides hit them, and how much they can take to make the drug work. With all medications, you take what is effective and acceptable to your system, this simply can be different between people. Again though, if .25mg is causing you issue, bummer. I could see someone being spiteful about it, everyone else can use it but even small doses cause issues to that person. Sorry to hear that.
In my case, when I took it 10 years ago, I had no understanding that there were sexual side effects, didn't read up, just young and dumb. Slowly however, my drive went away, and all the other usual problems set in. Didn't even know it was finasteride until I decided to stop, mainly because I suspected it was hurting my general health somehow. Bam, within a week everything returned, and I realized that it had been messing with my sex life. The decline had happened so gradually I hadn't attributed it to finasteride. But sure as sh*t, when I got off 1mg, my drive and abilities came flying back. I was surprised and moved on.
Jump to now, older and wiser. I realize lower doses probably will work for me, .25 has caused no sides. Now, I don't know if .5mg will be the same, but suspect it will be ok. 1mg is out however. No BS here, just straight personal story.