Hello, I just read your query. Albuterol which you are using for allergic respiratory problem is a bronchodilator. Bronchodilator usually relaxes muscles of bronchi(airway that conducts air into lungs), as a result makes breathing easier during allergic reaction. * Rapid heart rate or pulse rate is one of the side effects of using albuterol. * You can discuss the thing with your physician and opt out for alternative. But if you can not contact him immediately and other dose is due then for the time being use half respule of albuterol and you can also mix the half respule with normal saline. * But do contact with your treating doctor and go for some other option. * I hope you find my answer helpful. Thank you.