title: Doxycycline tolerance study. Incidence of nausea after doxycycline administration to healthy volunteers: a comparison of 2 formulations (Doryx' vs Vibramycin').
abstract: In a randomised, double-blind, 3-way cross-over trial, the incidence of nausea associated with 2 doxycycline 100 mg formulations (Doryx' and Vibramycin') were compared. The original study cohort comprised 103 healthy male volunteers, with 97 subjects completing the trial. Subjects were randomly allocated to 1 of 3 treatment sequences and received a single dose of Doryx', Vibramycin' or placebo, with a 7-day washout prior to cross-over. At half-hourly intervals, from 0 to 2 h post-dose, subjects completed questionnaires to indicate if they felt nauseous. Data were analysed according to a log-linear method for the analysis of cross-over trials with categorical responses. Seventeen, 29 and 11 subjects experienced nausea with Doryx', Vibramycin' and placebo, respectively. A significantly greater number of volunteers indicated a positive response with Vibramycin' vs Doryx' and vs placebo; the positive response frequency was not significantly different for the Doryx' vs the placebo regimen. Treatment sequence had no significant effect on response, although a marked first-dose effect was noted; the first (vs the second and vs the third) regimen was 1.5-2 times more likely to induce a positive response.
authors.affiliation: Cortecs Limited, Deeside, Clwyd, UK.
authors.forename: M J
authors.initials: MJ
authors.lastname: Story
authors.forename: P I
authors.initials: PI
authors.lastname: McCloud
authors.forename: G
authors.initials: G
authors.lastname: Boehm
mesh_terms: D000328:Adult; D002214:Capsules; D003692:Delayed-Action Preparations; D004311:Double-Blind Method; D004318:Doxycycline / Q000008:administration & dosage / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009325:Nausea / Q000139:chemically induced*; D011897:Random Allocation; D011795:Surveys and Questionnaires
chemical_list: D002214:Capsules; D003692:Delayed-Action Preparations; D004318:Doxycycline