I spoke with the prescribing doc today, she looked up the study, and on the question or whether minoxidil interferes with testosterone replacement therapy said, "I can't say for sure. Ask your endocrinologist", who still hasn't replied.
I did post something similar on another board, and this reply was made:
so i will chime in here with my brief understanding on how these meds work. not sure about the one you are currently using but the other ones i do know of. so all of them unless i am wrong on yours work by blocking dht. so dht is the most anabolic portion of the drugs that we use. some drugs are dht derived and others like test actually convert. higher levels of dht in your system is where you get all the bad stuff that we dont want ie hair loss oily skin etc... blocking dht in a sense is going to weaken the effects of your compounds. so the trade off is either take one of the meds to block it and have lesser gains or find ones that dont hammer the piss out of your hair line. i was watching a video from one of the steriod docs a few months back and he was addressing this very issue. he said that you could use the other 2 meds and run the risk of your dick never working again and lessening your gains or try the other approach of using non dht derived compounds and being very easy with the ones that convert over to dht. i am like jipped, i started shaving my head for work way back when and when i went to grow it back it didnt come back. so at that point i was just like fuck it, it's already gone anyway.
i know we are all vain ass holes and stuff but here is the kicker. so if you are having issues with hair loss while on then you can bet your ass that you are also having prostate issues as well. you are dht sensitive and dht also hammers the shit out of your prostate as well. that to me is way worse but then again the hair loss drugs also treat prostate issues and that's why they believe it can fuck up mr happy for good.
i have always been a firm believer in if it works for you and you are happy then go for it. so if it is working and you arent seeing any issues then keep on trucking. funny side note. a buddy of mine who didnt use aas at all and in his lower 20s was using the rogain stuff forever. his shit fell out on him at just a slower rate. he was so pissed that he spent so much money and it still came out. some people just have shit luck and genetics when it comes to that stuff i suppose