Dan. I'm not a physician, but I'll toss in my two cents worth. I think that 5 days on Cialis is simply too short of a time to actually see improvement in your urination regiment. I was on Avodart for 4 years, and I know when I first began taking it, they told me it usually takes several weeks to "kick in". Once I was on it daily, my urination got better (slowly). I have had times where my urination pattern was fine
for weeks or even months, and then, without warning I had a "bad night" where I was up most of the night. Standing over the toilet trying my best to pee, and nothing. 15 minutes later some urination occurs. I just think it's part of the BPH thing, and I wouldn't put too much weight into one bad night. If this becomes a habitual matter (nightly or 5 nights a week), then a discussion with your urologist is in order. Be carefull of caffienated drinks anytime past 5pm, same holds true with teas, coffee. I usually cut way back on my liquid intake after dinnertime. Same with alcohol. The key word here is moderation (sadly). Stay away from cold water (ice cubes), that always riled things up for me.
My guess for you is that you had a good, quiet, string of evenings where you were feeling good. One bad night is going to happen. Cut back on your fluid intake after dinnertime and see what happens.
In my case, I dealt with pretty severe symptoms for years, and 2 weeks ago I bit the bullet and had a Terp done. They told me that I'd be up 4-5 times per night for the next 2-3 months while I recover (true). My flow is dramatically improved, very painfiul urination, but slowly improving, some residual bleeding, normal.
Keep an eye on this stuff. Make sure you see your urologist as needed, and make sure his exam includes a DRI. Make sure they draw blood and give you a PSA reading. I had PSA's in the 20's. Taking Avodart faithfully got my PSA's below 5. Make sure you keep a close eye on all this. No reason for panic, but do not ignore symptoms, especially if they are getting worse. If you do not have faith in your urologist, or he's blowing you off, find a new doc. The smartest thing I could have done. If you're in the Phoenix, AZ area I can recommend a really good one.
Best of Luck, Tim