Yes, but when I switched to the lower dosage it was just as effective - so don't go popping the higher dose. I had a lot more hair back then when I started, but my regimen definitely stopped the male pattern baldness and grew some back. I wasn't religious about it, and eventually just got complascent and let my prescription expire. I subsequently dabbled here and there with treatments as I felt like it, but in all likelihood it was money down the drain since I wasn't commited to it. My gains reversed and my loss progressed for the next several years. Here I am!
I've decided to go it again with the so-called "Big 3"... I was younger back then and not quite as responsible from a commitment perspective. I see a lot of guys here who have the mindset I did back then - which is a very poor one indeed. In hindsight, I advise you to:
1) See an MD before beginning treatment. Get yourself a thorough checkup and discuss your hairloss. See a dermatologist who is knowledgeable about the topic.
2) If you and your doctor decide that treatment is appropriate, stick to it. No skipping days or weeks. Don't stop and start treatments just because you get paranoid that something isn't working, or that it isn't meeting your timeline expectation. You might as well burn your money in a bonfire, and you'll have wasted time (and possibly hair).
The only caveat is if you're experiencing unexpected side effects to the treatment medication. If this happens, consult your MD and make adjustments when prescribed.
3) Give it time. It took time to lose your hair and it will take time to stop the loss and potentially regrow some. Don't freak out if progress isn't made in the first month, 3 months, 6 months, or longer. Don't analyze progress every day. You won't see anything. Check things out every month or so, and AGAIN, don't freak out if you don't sense progress. We all respond (or don't respond) differently to treatment. Hairloss is no different than some other conditions.
4) Prepare yourself for the possibility of treatment-induced shedding. It's just the way it is, and should be viewed as an encouraging sign that you're responding. Generally that hair will be replaced with new growth, and would have fallen out over time anyway. One step back, two steps forward. I've been there and can attest.
5) Don't obsess and mope around. You are your own worst critic. It's easy to get maniacal about what other people are thinking about your hair. Believe me, most people aren't scrutinizing you. You think they are, but they aren't. The mind can be very cruel, but you can control that to a large extent. Get perspective and don't let it rule your life. Often, people get into a funk/depression, start acting differently and selfishly, and THEN people don't want to be around them (rightly so). Don't barricade yourself in your room in a nosedive of self-pity. Get out and get with it like normal.
6) Don't be negative. Don't freak out if you read a negative, bitter post on this board. Most guys on here are just like you, going through the tough reality of male pattern baldness. There's a lot of emotion sometimes. Most have not not applied #2 and #3 above, and some are going through #4, causing them to display #5.
Read these 6 steps as many times as it takes to drive them into your head. Good luck to you.