How safe is it to use a 12.5% Minoxidil Solution?
A. Less than 0.1 % of patients experience side effects from 12.5% Minoxidil Solution. There is a reason for this high safety margin. It requires a serum concentration of 20 ng/mL of minoxidil to cause any hemodynamic or other systemic effect in the human body. Allowing for the average 1.4% absorption of minoxidil from topical application, a 5% minoxidil solution will result in 1.16 ng / mL of minoxidil in the serum and a 12.5% solution will result in a 2.9 ng / mL of minoxidil in the serum level. So, there is more than a 16-fold safety margin from the use of 5% topical minoxidil and a 7-fold safety margin from the use of 12.5% Minoxidil Solution.
