3d image of theophylline skeletal formula

theophylline dimethylxanthine methylxanthine mechanism toxicity structure drug level injection inhaler asthma tablet caffeine bronchodilator nursing metabolism pharmacology side effect chemical action structural formula interaction respiratory copd xanthine theobromine infant apnea smooth muscle 3d rendering biochemistry molecule molecular skeletal isomer preparation mount cure medication iatrogenic overdose contraindications pharmacodynamics pharmacokinetics pharmacophore