Will minoxidil react with benzoyl peroxide?

Minoxidil probably would not react with benzoyl peroxide but if you want to use the two drugs together see a doctor first.

These are generally fine provided you are being followed by a physician who can evaluate you periodically. I often recommend minoxidil first and benzoyl peroxide 4-6 hours later. Sometimes a topical antibiotic is needed with the benzoyl peroxide (like clindamycin).

I do not know of any connection between these two substances, but I would not use them together.