Occationally palpitations and shortness of breath may occur. Symptoms may include palpitations, feeling faint, sweating, shortness of breath, or chest pain. Symptoms include coughing up sputum, wheezing, shortness of breath, and chest pain. Symptoms include episodes of wheezing, coughing, chest tightness, and shortness of breath. Asthma is characterized by recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing. Overdose symptoms include nausea, vomiting, hypotension, hypoventilation, shortness of breath, and fainting. Early symptoms include headache, dizziness, fast heart rate, shortness of breath, and vomiting. When it affects the lungs, wheezing, coughing, shortness of breath, or chest pain may occur. Some individuals may experience chest pain, shortness of breath, or nausea before cardiac arrest. Common signs of infection include respiratory symptoms, fever, cough, shortness of breath, and breathing difficulties. Typical symptoms include fever, cough, diarrhea, and shortness of breath. Symptoms typically include gradual onset of shortness of breath and a dry cough. If exposed to large amounts, nausea, headache, and shortness of breath may occur. Common side effects include headache, vomiting, confusion, shortness of breath, and high blood pressure. Common symptoms include fever, cough, fatigue, shortness of breath, and loss of smell and taste.