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What is the general effect of aspirin on blood pressure?

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Quick Answer

Aspirin’s effect on blood pressure appears to be linked to the time of day it is taken, states WebMD. Over time, taking aspirin regularly at night lowers blood pressure, while taking aspirin in the morning appears to elevate blood pressure slightly.

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Full Answer

Researchers in Spain studied the effect of aspirin on blood pressure in a study that revealed that aspirin lowers blood pressure when taken at night, notes WebMD. The study included 328 people with mild high blood pressure, which means a systolic reading (the top number) of 140-159 and a diastolic reading (the lower number) of 90-99. On average, the participants were 44 years old.

Study participants received advice on lowering their blood pressure with drug-free methods, such as diet, says WebMD. They were then split into three groups. One group took no aspirin, one group took aspirin each morning, and one group took aspirin each night. The study lasted for three months, and all participants wore devices that constantly monitored their blood pressure.

Individuals who took aspirin at night saw an average decrease in their systolic blood pressure of 6.8 and a decrease in their diastolic blood pressure of 1.6, explains WebMD. Almost nine out of 10 in the nighttime group experienced a drop in blood pressure.

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