Before using this medication, tell your doctor or pharmacist your medical history, especially of: breathing problems (e.g., chronic obstructive pulmonary disease-COPD), heart problems.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: breathing problems (such as emphysema, chronic bronchitis, asthma, smoker's cough), cough with blood or large amounts of mucus.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: breathing problems (bronchitis, emphysema, sleep apnea), liver disease.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: breathing problems (e.g., asthma, emphysema), glaucoma, prostate problems, seizure disorder.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: breathing problems (e.g., emphysema, chronic bronchitis), high levels of calcium, dehydration, diabetes mellitus, gout, narrow-angle glaucoma, overactive thyroid (hyperthyroidism).