The only difference is, modafinil is classified as a drug and so the negative effects are termed "side effects" while caffeine is classified as food and so the same exact negative effects are termed "overuse". It's an emotional/connotative difference. The list itself is almost identical: nervousness, headaches, insomnia, dry mouth, rapid heartbeat etc. In fact, I don't see caffeine's potential dangers of mania, depression and psychosis on the modafinil list. How's that for conservative?
http://en.wikipedia.org/wiki/Caffeine#Overuse
The only difference is, modafinil is classified as a drug and so the negative effects are termed "side effects" while caffeine is classified as food and so the same exact negative effects are termed "overuse". It's an emotional/connotative difference. The list itself is almost identical: nervousness, headaches, insomnia, dry mouth, rapid heartbeat etc. In fact, I don't see caffeine's potential dangers of mania, depression and psychosis on the modafinil list. How's that for conservative?