Have you ever experienced problems after switching minoxidil concentrations?
In January 2011, I decided to make an experiment with Xandrox 15 Plus in order to regrow some hair in my temples. I applied Xandrox 15 Plus once daily in the morning in my temples, and continued in using 5% minoxidil on the whole head in the evening.
In June/July 2011 I noticed that I regrew few thick hairs on bald places, but at the same time, my hairline in my left temple was utterly devastated. (I applied it only on bald places in my right temple.) I realized that I experienced a minoxidil-induced shedding that wouldn't stop. The stuff was simply too strong for me. Since I ran out of Xandrox then, I bought 15% EssenGen from MinoxidilMax and applied it only once every other day for 1 month, and in August 2011 I started to apply a 10% mixture every other day. In February 2012 I found out that it was producing no further results and I quitted 10% minox completely.
The thinned hairline has improved a bit in the meantime, but it was still below the original level. I noticed that there were always some new hairs growing, but the density didn't increase, which suggested that the hair cycle was shortened and the hairs fell out, grew back, fell out and so on.
Now, I would suppose that after quitting the strong minoxidil concentrations, which f*cked up my hair cycle, my lost hair would grow back. Some people even reported that after heavy shedding on 15% minox and switching back to 5%, they not only regrew the lost hair, but experienced an amazing regrowth.
Well, this doesn't seem to be my case. In mid-April 2012 (i.e. 2 months after switching back to 5% minoxidil), I started to lose whole groups of hairs along my hairline in the left temple, and now, even after 3,5 months, it still didn't stop. My left temple is in the worst state ever, already matching the Xandrox-induced shed. The lost hairs start to grow back after some time, but very, very slowly, and I wouldn't bet my money that they will regrow back in full density and strength.
My biggest concern is that 5% minoxidil may cease to work in me. :P However, this would be quite an unlikely coincidence, and furthermore, the hairline in my right temple, where I applied it only on bald places, remains solid like before. Therefore, I suspect that the hair cycle may only be "resetting", but I wouldn't expect that the hairline would be getting worse even after 3 months. It's mindboggling and depressing, because I don't know, what's happening. I have been using 6% minoxidil since mid-April (a mixture of 5% Kirkland with 15% EssenGen), which seems to be the best compromise in this situation.
I understand that this question is difficult to answer via the internet, but it is always better to share experience. One never knows, if someone experienced the same. In any case, if I had known that I would have gone through such an ordeal, I would have never used neither the Xandrox, nor any similarly strong minox! :P