Attias 1987.

Methods	Randomised controlled trial comparing adverse effects and efficacy of transdermal scopolamine with placebo for preventing seasickness
Participants	38 male volunteers aged 20 to 25 years
Interventions	Transdermal scopolamine or identical placebo patches applied prior to a 3‐day cruise. No dosage information was provided.
Outcomes	Subjective ratings of seasickness and adverse effects of treatment
Notes	All participants were disallowed drugs or alcohol during the study Schultz rating: randomisation B; allocation concealment B; selection bias B; blinding C
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	B ‐ Unclear