However, the potential effects of pseudoephedrine on heart function should not be dismissed, warns Claes Lundgren, MD, PhD, director of the Center for Research and Education in Special Environments at the State University of New York in Buffalo. People diving at great depths may experience an immersion effect, in which blood travels away from the limbs and into the chest, where it may distend the heart and render it more vulnerable to the effects of drugs that affect heart rhythm. Grossan says that his patients have found the scopolamine patch to be a good antidote to seasickness. They can remove it just before diving or wear it in the water if they dive with a hood. Some people also have had good luck with wristbands that compress certain pressure points and are reported to relieve nausea.
Risk is a relative concept.
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