![]() Meanwhile, a meta-analysis of over 600 published reports found no associations between taking selective beta-blockers and severe or fatal asthma attacks. The researchers found that selective beta-blockers were “not associated with a significantly increased risk of moderate or severe asthma exacerbations.” On the other hand, non-selective beta-blockers were linked to a significantly increased risk of moderate to severe effects on asthma, even when taken at low doses. One study looked at data from over 35,000 patients with asthma and cardiovascular disease, of whom 14.1% had been given selective beta-blockers and 1.2% the non-selective type. Ozaki says this means that “metoprolol works selectively in the heart with minimal or no effects on lungs orally at doses of less than 100 mg in adults.”Īs such, she continues, “the risk of experiencing respiratory problems is lower than with other beta-blockers.” Meanwhile, the non-selective variety targets beta-1 and beta-2 receptors in the heart and lungs. ![]() Selective beta-blockers only target beta-1 receptors in the heart muscles. ![]() There are two categories of beta-blockers: selective and non-selective. It largely depends on the severity of a person’s asthma and the type and dosage of beta-blocker prescribed. There’s no simple yes-or-no answer for this one.
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