Also: the dangers of the antibiotic clindamycin and an asthma patient asks what happened to Primatene Mist. Q: As a baby boomer, I heard that servicemen in World War II, Korea and Vietnam were given saltpeter in their food as a deterrent for sexual urges. I wonder if that is true and, if so, whether there is any connection to saltpeter and prostate problems. A: The belief that saltpeter (potassium nitrate) will reduce sex drive is an urban legend. Rumors persist that authorities add this preservative to food served at institutions, like the military, prisons, all-male boarding schools and summer camps. There is no evidence that this has ever been used as a strategy to dampen desire. This compound has been used to cure meat. It is also found in fireworks, fertilizer and toothpaste formulated for sensitive teeth. Tom’s of Maine Rapid Relief Sensitive Toothpaste, Sensodyne and prescription-only Colgate PreviDent 5000 all contain potassium nitrate. The Environmental Working Group ranks this as a safe toothpaste ingredient. We could find no evidence that it impacts the prostate. Q: I was given a prescription for clindamycin when a thorn was removed from my finger. This is a dangerou...