Minox 5% vs 15%?

[dan2to]

Hey guys, sorry for the dumb newbie questions I have here, but hope someone can help me out.

1) when u guys say the word "Minox" you're referring to Rogaine, correct? I was under the impression the main thing in Rogaine, was Minox?

2) I've been using the regular 5% rogaine foam. I want to switch to 15%.
Is 15% safe to use? Or should I go to a dermatologist 1st and get tested?

3) Does Rogaine have a 15% foam or liquid? Or must I buy a different brand? And if so, which brand should I buy? Do I need a prescription for it?

Thanks!!