They are used to treat depression. • Malaria or medicines used to treat infections responsible for sleeping sickness. • Beta-blockers, such as propranolol, metoprolol, atenolol for angina and heart beat disorders or any treatment of high blood pressure (for example thiazide diuretics (bendrofluazide), ACE inhibitors (captopril), calcium antagonists (nifedipine) and alpha-blockers (prazosin).