"Me too" drugs are quite useful. Let's say that compound A and compound B both treat your condition. Both have side effects, but there's some difference in th

"Me too" drugs are quite useful. Let's say that compound A and compound B both treat your condition. Both have side effects, but there's some difference in the two sets. Or, if we're talking about compound still protected by patent, what if you have a negative reaction to the inactive ingredients in one? Would you rather that patients who can't tolerate side effects just go without? Serendipity is a real thing too. Nobody started with the idea of creating boner pills or hair regrowth cream when they created Viagra and Rogaine. Both were failed treatments for another condition that happened to have useful side effects.