Be careful of using expired drugs

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(CNN) - Experts say using an expired drug is probably ok if you have a minor health issue such as a headache or sinus trouble.

If your condition is serious, don't chance it.

Many medicines, especially tablets and capsules have a shelf life well beyond the date on the bottle.

Dr. Sharon Bergquist - Emory School of Medicine: The reality is that because these expiration dates are so conservative probably even 5 - 10 years from the time of the expiration date a person can try still using their product.

But even with medications that are long expired the amount of effectiveness is usually over 90%.

There are certain medicines, that should not be used beyond the expiration date, often because they treat chronic conditions such as heart disease or diabetes where 100% potency is crucial.