Minoxidil
The discovery of Viagra is only one of the great accidental discoveries to cheer middle-aged men.

For those battling a problem above the shoulders -- thinning and falling-out hair -- the drug Minoxidil, branded by McNeil-PPC, part of the Johnson & Johnson's ( JNJ) family, as Rogaine.

The drug-laced foam was synthesized after Upjohn researchers realized that a blood pressure drug, Loniten, had the side-effect of thickening and darkening hair. Upjohn was later sold to Pfizer and Rogaine was among the brands shipped over to Johnson & Johnson when the company sold its consumer-focused division in 2006.

Applied to the scalp, the drug is not touted as a full-on cure for baldness; its maker does boast of studies where 85% of male test subjects regrew hair after four months of twice-daily use.

Also used by women suffering from hair loss, Rogaine sells roughly $60 million a year, according to health care analysts at Information Resources. Earlier this month, the Food and Drug Administration approved a generic version made by Perrigo ( PRGO) that is expected to hit shelves next year.

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