Greg Harris was the 20th century's only major-league pitcher to throw with both his left and right arm (using a six-fingered glove).

This century, Pat Venditte is the only one who regularly pitches with both arms — and because of him, Major League Baseball established the Venditte Rule, which states that no pitcher is allowed to change arms in the middle of an at-bat. The batters were just too confused by that.

If switch-pitching seems confusing, think about how confused the millions of people taking multiple medications are when it comes to knowing what's being thrown at them.

And in the U.S., 24% of people have taken at least three prescription drugs in the past 30 days.

The result? You may end up with a new health issue, such as high blood pressure, as you successfully medicate for a problem such as depression. Then you have to take your antidepressant meds and start on an antihypertensive.

Or, if you're already being medicated for high blood pressure, you have to increase the dose or add another medication to that routine.

That's the alarm being sounded by a research letter that appeared in JAMA Internal Medicine. A nationally representative survey found that 18% of U.S. adults with high blood pressure also take medications such as antidepressants, prescription NSAIDs, steroids, anti-obesity drugs, decongestants, immunosuppressants, and estrogens, all of which may cause HBP.

If that sounds like you, talk to your doctors (notice that's plural) about your medications' impact on your blood pressure.