I took finasteride (1.25mg) and got side effects, so I stopped. Took me around a month to return to normal. I think most people are 2-6 weeks recovering. I haven't re-tried it, but I may do, one day.
I'm using Rogaine now, I'm pretty happy with the results, but at around the 5 month mark I started getting a really itchy head. Revita shampoo helped a little (I ordered it off the internet, but I think you have other ketaconazole options in Australia).
It also started itching when I switched back to the liquid after a month on the foam. I think I'll still stick with the liquid though, I really didn't like the foam.
Another guy here said the laser comb helped reduce irritation, and that his hair count improved when he started using it along side finasteride and minoxidil, too.
Hope this helps.