Mad King........I started daily Cialis about two weeks ago. I began having unreliable erections for the last year, coincidentally about the same time I started TRT. TRT has kept libido very strong, (basically wanting my wife every night), but the erections became so unreliable it definitely became an issue. I ordered some Cialis and Viagra from one of the India overseas dispensers to experiment. I decided to start daily Cialis at 10mg a day, and also take one 50mg Viagra pill about an hour before sex. It worked like magic the very first day. The first week, Cialis was giving me very strong pressure headaches, almost unbearable, I was losing concentration throughout the day and constantly having to clear me ears. I experimented by reducing to 5mg and the headache was still there, however a lot less severe. When I knew wife and I were plannig to be intimate I increased back up to 10mg along with the 50mg Viagra. I noticed that 5mg daily is probably enough for me and the headaches are a lot less severe. My headaches have also reduced even at 10mg a day (I've been experimenting going up and down). The good news for me is, the stuff works no matter what dose I take, and it seems that my body has become accustomed to it, so the severe headaches are now very mild at best. This has been the past 2 1/2 weeks from a brand new user.