A small glass of 100% fruit juice is a good part of a healthful breakfast, right? If you're on certain prescription medications, your fruit juice may be doing more harm than good.

Grapefruit juice, for example, can interfere with blood pressure medication and actually increase its efficacy, subsequently creating a risk of overdose. Conversely, recent research suggests that grapefruit juice may prevent certain anti-allergy medications from absorbing into the bloodstream properly. A component of grapefruit juice called naringin appears to be the culprit.

Researchers state that this finding may be the "tip of the iceberg" as other juices, including orange and apple, also contain naringin-like substances that may have similar effects.

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Itchy, watery eyes? Sniffling nose? Do the people around you say "bless you" more often than they say "hello?" Perhaps you're dealing with seasonal allergies. Allergy sufferers now have a new medication option on the market. The FDA recently approved a new prescription medication, Xyzal, for treatment of allergies and hives. Xyzal is approved for people 6 and older. In clinical testing Xyzal significantly reduced allergy symptoms such as sneezing, runny/itchy nose, and itchy eyes. For those with chronic hives, it reduced the severity of raised blotches and itching.

As with any medication, Xyzal has its potential side effects. Common complaints include fatigue, dry mouth, and nasal inflammation. Those taking Xyzal should avoid alcohol and shouldn't operate heavy machinery. People with impaired kidney function shouldn't take the medication.

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