Study details:

Study Design:. This is a single site, double-blind, placebo controlled, N-of-1 trial of clinically prescribed, individualised stimulant dose on ADHD symptomatology in children with FASD. The N-of-1 trial has four 2-week treatment blocks (each block consisting of 1 week active drug and 1 week placebo).

Interventions will include either prescribed stimulant (active drug) or matched placebo capsules, compared in four 2-week treatment blocks (each block consisting of 1 week active drug and 1 week placebo). Participants will be randomized to the sequence of the treatment arms. Randomisation will be in the two-week pairs - so the order of treatment (A) and placebo (P) to be randomly assigned within each two-week cycle.

Secondarily the investigators will collate outcomes across the N-of-1 trials and make use of a 'series' or multiple N-of-1 trial design18, chosen as it is a valid method of trial design for rare clinical disorders where individualized treatments are required. This design can result in robust evidence, assuming standards of methodological practice. 1 In an N-of-1 trial, each participant is assured of receiving both the study medication and placebo, and thus learns whether the treatment works specifically for them or not.

Study objectives:. 1. Primary objective:.

Test ongoing effectiveness of stimulant medication in individual children with FASD on pharmacotherapy for ADHD symptomatology, using individual N-of-1 trials. 2. Secondary objectives:.

Secondary objective 1: To examine feasibility and tolerability of the N-of-1 trial design in children with FASD and ADHD for future, larger studies that might seek to examine if the different stimulant types are equally effective relative to placebo. Secondary objective 2: Through quantitative analysis of a series of N-of-1 trials,1 explore individual factors that mediate the effect of stimulants relative to placebo on ADHD symptoms, on children with FASD, including underlying attention skills, cognitive function and other child/sociodemographic factors and additional prenatal exposures. Exploratory objectives: Investigators will review if there is any change in pediatrician patient management post trial.

Study Population:. Children (4-18 years) with FASD and ADHD seen by the Victorian Fetal Alcohol Service (VicFAS), prescribed stimulant medication for ADHD symptoms. The age limit selected was based on the age in which stimulants have been shown to be effective in controlling ADHD symptoms in the general population, and who are seen by the clinical service.

VicFAS assesses 20 children per year at the diagnostic clinic. All participants are currently approached for consent to the already established VicFAS database, which includes full child demographic, clinical and neurodevelopmental information as well as optional consent for future studies. Participants who have consented to this optional inclusion will be re-consented to this study.

A total of 20 participants will be approached for recruitment to the study. This will be a convenience sample of children seen through the VicFAS FASD diagnostic clinic since inception in September 2019 until study completion (n=20). Each participant will undergo repeated measures.

Estimation of the needed number of cross-overs (that is 'sample size' in N-of-1 studies) was based on having at least 80% power (β = 0. 20) to detect a 5. 9-point reduction.

With 36 observations per participant, (18 placebo, 18 active medication) we achieve \>80% power (alpha of 0. 05 will be used as the cut-off for significance, one-sided hypothesis test).

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