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Why do bronchodilators cause tachycardia?

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Beta2 agonist bronchodilators are designed to bind selectively to beta2 receptors in the lungs. Stimulation of sympathetic receptors in the heart can cause tachycardia or arrhythmia, and stimulation of receptors in skeletal muscle can result in tremor. Other possible side-effects include muscle cramp and headache.
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