I am under the belief that there is a diurnal variation in testosterone levels which are higher in the early morning than other times of the day. That might suggest that the best time to take Propecia is in the morning as the half life of the drug is only 4 hours. The half life of a drug is the time it takes for the body to reduce its concentration to half of what was taken.

回复者是Dr. William Rassman, Medical Director and Founder of the New Hair Institute.

其他就不翻译了,重点就是“每天一大早的睾丸激素的分泌水平是一天中最高的,建议一大早服用最好”

而且还有回复说,保持每天服用的时间规律