What you want to to do is stay away from bronzers and it will effect the minoxidil and your skin. And other self-tanning are DHA based which interacts with amino acids, DHA based products you will have free redicals such as Mallaid.
You're better off eating freaking carrots.
A good and a safe way of sunless tanning for you is to eat foods with carotenoids, which as antioxidants found in fruits and veggies such as mentioned before carrots. This will result in changes in skin color, when you eat food rich in carotenoids in high amounts. Plus they are more effective and have more attractive skin color, plus they protect your skin. Look it up online.
Don't just take my word for it.