This simply isn't true in all cases. For example, I take Lunesta for sleep. My insurance tried to force me to switch to its generic counterpart, eszopiclone, by raising the copay on the name brand from $10 to $230. I have never suffered from depression in my life, until I took this medication for just three days and wound up in a debilitating state of depression. I immediately stopped taking it, and the depression went away within a day. I now pay the $230 per month, a small price to pay for sleep without the disastrous side effects of the generic.