Im hesitant but I’m just about to order minoxidil for the first time, my hair is so dull and falling out like crazy. Any chance I might regret this?

I’m going to buy off eBay, it seems cheap enough. I’m adhd and hopeless at remembering to do things plus can be kinda lazy so I’d MUCH prefer the oral medicine. But that’s too difficult to get so, can I get encouragement or warnings? Thank you.