title: Letter: Time-dependent effect of oral procainamide in patients with exertional arrhythmias.
mesh_terms: D000284:Administration, Oral; D001145:Arrhythmias, Cardiac / Q000188:drug therapy*; D005080:Exercise Test; D006207:Half-Life; D006801:Humans; D005082:Physical Exertion; D011342:Procainamide / Q000008:administration & dosage / Q000097:blood / Q000627:therapeutic use*; D013997:Time Factors
chemical_list: D011342:Procainamide