Cold medicine can cause heart palpitations
Most people reach for over-the-counter medicines to relieve nasal congestion when a cold or flu leaves them with a stuffy nose. Most of the common decongestants in cold medicine contain stimulants, usually pseudoephedrine or phenylephrine. These stimulants work by opening up blood vessels, which decreases swelling and congestion inside the nose. However, stimulants can leave you feeling jittery, increase your blood pressure, and raise your heart rate, even causing heart palpitations. Like antihistamines, it may be better to delay taking stimulant decongestants until after your workout to avoid dangerously a high heart rate. Some doctors may also recommend taking cold medicines that contain non-stimulant decongestants, including some nasal sprays.