title: Increased serum theophylline concentrations secondary to oral verapamil.
mesh_terms: D000284:Administration, Oral; D000368:Aged; D004347:Drug Interactions; D005260:Female; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000188:drug therapy; D013806:Theophylline / Q000097:blood*; D014700:Verapamil / Q000378:metabolism / Q000494:pharmacology*
chemical_list: D013806:Theophylline; D014700:Verapamil