If you are a Revivogen user, you can put your minoxidil in a used Revivogen bottle.
Every pack with 3 bottles of Revivogen comes with a sprayer. Each spray sprays 1 ml of solution.
Applying minoxidil with a sprayer is definitely the more convenient way to do it.
If are reluctant to use Revivogen because it stinks, just apply an hour and then wash it out with shampoo (for example Regenepure NT). From my personal experience applying Regenepure for just an hour is about 70% as efficient as applying it an entire night!
Fred, I'm from Brussels too. Every pharmacy in Belgium sells basically the same sprayers. They are awful, unpractical and they spread to much liquid at a time (at least 0,2 ml per spray). That's why they are messy. In contrast, the Revivogen (or minoxidil Regenepure) sprayers are much smaller and user-friendly and spray a little amount of liquid (Revivogen: 0,1 ml per spray). Sorry, I was wrong in my last post (it's 0,1 ml per spray, not 1 ml).
My advice: if you find handy sprayers, such as those I mentioned, give them a try and you will never use droppers.