title: Methylphenidate significantly improves driving performance of adults with attention-deficit hyperactivity disorder: a randomized crossover trial.
abstract: Although patients with attention-deficit hyperactivity disorder (ADHD) have reported improved driving performance on methylphenidate, limited evidence exists to support an effect of treatment on driving performance and some regions prohibit driving on methylphenidate. A randomized, crossover trial examining the effects of methylphenidate versus placebo on highway driving in 18 adults with ADHD was carried out. After three days of no treatment, patients received either their usual methylphenidate dose (mean: 14.7 mg; range: 10-30 mg) or placebo and then the opposite treatment after a six to seven days washout period. Patients performed a 100 km driving test during normal traffic, 1.5 h after treatment administration. Standard deviation of lateral position (SDLP), the weaving of the car, was the primary outcome measure. Secondary outcome measurements included the standard deviation of speed and patient reports of driving performance. Driving performance was significantly better in the methylphenidate than in the placebo condition, as reflected by the SDLP difference (2.3 cm, 95% CI = 0.8-3.8, P = 0.004). Variation in speed was similar on treatment and on placebo (-0.05 km/h, 95% CI = -0.4 to 0.2, P = 0.70). Among adults with ADHD, with a history of a positive clinical response to methylphenidate, methylphenidate significantly improves driving performance.
authors.affiliation: Section Psychopharmacology, Faculty of Science, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands. j.c.verster@uu.nl
authors.forename: Joris C
authors.initials: JC
authors.lastname: Verster
authors.forename: Evelijne M
authors.initials: EM
authors.lastname: Bekker
authors.forename: Marlise
authors.initials: M
authors.lastname: de Roos
authors.forename: Anita
authors.initials: A
authors.lastname: Minova
authors.forename: Erik J E
authors.initials: EJ
authors.lastname: Eijken
authors.forename: J J Sandra
authors.initials: JJ
authors.lastname: Kooij
authors.forename: Jan K
authors.initials: JK
authors.lastname: Buitelaar
authors.forename: J Leon
authors.initials: JL
authors.lastname: Kenemans
authors.forename: Marinus N
authors.initials: MN
authors.lastname: Verbaten
authors.forename: Berend
authors.initials: B
authors.lastname: Olivier
authors.forename: Edmund R
authors.initials: ER
authors.lastname: Volkerts
mesh_terms: D000328:Adult; D001334:Automobile Driving / Q000523:psychology*; D000697:Central Nervous System Stimulants / Q000627:therapeutic use*; D018592:Cross-Over Studies; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D008774:Methylphenidate / Q000627:therapeutic use*; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D011597:Psychomotor Performance / Q000187:drug effects*; D012044:Regression Analysis; D016896:Treatment Outcome
chemical_list: D000697:Central Nervous System Stimulants; D008774:Methylphenidate