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the claim

Taking aspirin lowers blood pressure within hours.

the verdict
CONTESTED PARTIAL
Recorded sources
1 source for · 2 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that taking aspirin lowers blood pressure within hours?

Partly. One small 1989 study found intravenous aspirin lowered arterial blood pressure within 30 minutes in six patients with renovascular hypertension, while a 2026 pilot study found low-dose bedtime aspirin did not lower blood pressure over two weeks, and a 1986 review states aspirin has not been implicated in attenuating blood pressure control. The evidence covers only narrow patient groups and does not settle whether aspirin generally lowers blood pressure within hours.

Verdict: CONTESTED PARTIAL · 1 source for, 2 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 1
Aspirin lowers blood pressure in patients with renovascular hypertension.
1989
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Imanishi, M., Kawamura, M., Akabane, S., Matsushima, Y., Kuramochi, M., Ito, K., Ohta, M., Kimura, K., Takamiya, M., & Omae, T. (1989). Aspirin lowers blood pressure in patients with renovascular hypertension.. doi.org. https://doi.org/10.1161/01.hyp.14.5.461

Evidence against · 2
Is sleep a mechanistic factor in the blood pressure lowering effects of low-dose aspirin taken at bedtime? A pilot study.
2026
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M, V., H, Y., M, G., M, H., & JM, M. (2026). Is sleep a mechanistic factor in the blood pressure lowering effects of low-dose aspirin taken at bedtime? A pilot study.. doi.org. https://doi.org/10.1093/sleepadvances/zpag058

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More against · 1
The arthritic patient with hypertension: Selection of an NSAID
1986
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The arthritic patient with hypertension: Selection of an NSAID. (1986). doi.org. https://doi.org/10.3109/03009748609101453

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