Why do I feel dizzy and confused after application of minox 5%?

I apply minox twice a day. But after application I feel kinda retarded and dizzy. I can't concentrate or think properly. This effect lasts for 2-4 hours after application. I have a bad hairfall and don't want to quit minox. Neither I want to fell retarded for 8 hours a day for my whole life :/ How to get rid of this problem?...I have heard minox lowering BP but mine after application seem to be same as before application