The side effect of coffee you didn’t know

Hot Black coffee in a white cup on the table.High blood pressure is a growing problem in the U.S. If left untreated or managed poorly, it can contribute to serious health complications, leading to a heart attack, stroke, and even death. Many Americans take blood pressure medication to lower their numbers, but some patients don’t seem to experience much improvement despite the therapy. New research has found a possible culprit that makes high blood pressure medication less effective.

Coffee reduces benefits of blood pressure medications

The phase one study conducted by researchers at Western University and Lawson Health Research Institute found that occasional coffee consumption can have a negative impact on a common type of blood pressure medications known as calcium channel blockers.


Researcher Dr. David Bailey said, “Coffee causes the blood vessels in your body to narrow and this raises the blood pressure, whereas the calcium channel blockers cause the blood vessels to expand in order to lower the blood pressure. What you have is essentially a competition between the two.”

The researchers suggest that these findings could have large implications on proper diagnosis and management of high blood pressure. Dr. Bailey continued, “If you were to, for example, have coffee on the morning of a visit to see your local doctor for a checkup, they may find your blood pressure a bit high. When in actual fact, it’s not due to the fact that you have a problem, an abnormality in how your blood pressure is regulated – it’s just that you had coffee earlier in the day.”
Occasional coffee drinking is defined as having a cup of coffee twice a week or less. Many people can relate to these findings, yet little research has been conducted on this particular subject to better understand the relationship.

“It’s even more emphasized by the fact that guidelines from societies that deal with high blood pressure in North America, in Europe, in Canada have no comments about coffee consumption or the potential interaction with drugs that lower blood pressure,” Dr. Bailey concluded.

Although coffee has been associated with numerous health benefits, including boosting metabolism, protecting the liver, and reducing the risk of heart disease and diabetes, these benefits are not as universal as once believed. As demonstrated, coffee may actually be harmful for those on blood pressure medications. Additional research is required to better understand the relationship between coffee and blood pressure in order to offer better recommendations to patients.


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