Sodium benzoate: Dr. Pepper contains sodium benzoate, a flavor preservative that triggers chest tightness in some folks with asthma. Sodium benzoate is used in many soft drinks & other foods. Its possible that there's more in dr. Pepper than other drinks or perhaps you're just a "pepper". Effervescence may play a role. Try pouring the soda back & forth between 2 glasses three or four times before drinking.
Answered 3/26/2013
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Sodium benzoate: Can trigger an asthma attack, and the pepper's got it.
Answered 3/1/2018
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