More rare is actually relaunching the compound as a new drug--as Lilly has done with Sarafem.

FORBES: Lilly Gives Away Prozac, Makes Money

Launching Sarafem doesn't just allow Lilly to make more money off an existing compound before the patent runs out, although it certainly does that.

FORBES: Prozac To Fight PMS Under New Name

Lilly is likely to do a better job marketing Sarafem.

FORBES: Prozac To Fight PMS Under New Name

But instead of simply marketing Prozac to women with PMDD, Lilly has decided to launch fluoxetine hydrochloride, the chemical formerly known only as Prozac, as a brand-new drug called Sarafem.

FORBES: Prozac To Fight PMS Under New Name

However, according to Dr. Richard Wurtman, the MIT professor who developed Redux and the recent Eli Lilly lly (nyse: lly - news - people) anti-premenstrual syndrome drug Sarafem, the problem was not with American Home's drugs alone.

FORBES: American Home Can't Shake Diet Drug Lawsuit Costs