narcolepsy
"This is the first and only drug I've ever taken for narcolepsy and my standard of life, work, etc. has improved incredibly since then. I do get the side effects (dry eyes, dry mouth, crawling skin, headaches, tummy problems and ironically enough: sometimes tiredness too) but these are subsets of one main side effect - massive dehydration. So I just drink lots of water and am mindful of it. Once you get over the main onset headache (which admittedly took me a few weeks), the benefits far out way the cons. I'm lucky with the costs as I live in the UK so 6 boxes x 30 tabs(200mg) only costs the price of a prescription (about "