The beginning dose of minoxidil can be as low as 2.5 mg/d with a maintenance dose generally falling in the range of 10-40 mg/d. Minoxidil can be given from once to three times daily with the most ...
In the case of tachycardia with minoxidil, which proves difficult to control, it is reasonable to empirically split-dose the total required amount of minoxidil on a two-or three-times daily basis.
The NHS states Minoxidil is generally well tolerated and most people experience no side effects. It is therefore unlikely that on the low dose minoxidil you will experience any side-effects.