title: Pharmacokinetics of once-daily theophylline dose following the morning versus evening administration.
abstract: The pharmacokinetics of theophylline (Uniphyllin) in blood and saliva was compared after morning and evening administration of a once-daily dose in a randomized cross-over study. Ten bronchial asthma patients received multiple doses of 800 mg theophylline at 8 a.m. and 8 p.m. under controlled food conditions. The precision of the serum concentration prediction from salivary measurements in individual patients was sufficient to obtain identical pharmacokinetic parameters and parallel concentration-time curves. There were no significant differences in the values of mean residence time and area under the concentration-time curves after morning and evening dosing, either in the kinetics of elimination and in the volume of distribution. The fluctuation of concentrations during the dosing intervals was 100% after morning doses and 80% after evening doses. No consistent interference with food was found. Circadian variation in the kinetics of drug disposition after once-daily theophylline administration did not occur. In order to achieve higher therapeutical levels at night and in the morning, the evening dosing seems to be preferable.
authors.affiliation: State Institute for Drug Control, Prague, Czechoslovakia.
authors.forename: Z
authors.initials: Z
authors.lastname: Trnavská
authors.forename: V
authors.initials: V
authors.lastname: Vondra
authors.forename: J
authors.initials: J
authors.lastname: Elis
mesh_terms: D000328:Adult; D004334:Drug Administration Schedule; D005260:Female; D006207:Half-Life; D006801:Humans; D008297:Male; D008875:Middle Aged; D011897:Random Allocation; D012463:Saliva / Q000378:metabolism; D013806:Theophylline / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*
chemical_list: D013806:Theophylline