Stephanie Ann Brown, aged 36, of The Threshold, Jurby, has pleaded not guilty to driving under the influence of diazepam.
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The offence is alleged to have been committed on February 26 at Old Castletown Road in Douglas.
Ms Brown was represented in court by advocate Jane Gray.
A pre-trial review will be held in summary court on September 28.
Bail continues in the sum of £500.