TheophyllineAminophyllineTheobromineXanthinesBronchodilator AgentsDelayed-Action PreparationsPhosphodiesterase InhibitorsAdenosinePurinergic P1 Receptor AntagonistsEnoxacinDrug InteractionsCaffeineCyclic AMPBucladesineLung Diseases, ObstructiveAsthmaReceptors, Purinergic4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinoneAlbuterolTerahertz SpectroscopyCytochrome P-450 CYP1A2ProcaterolAdministration, Oral