<prompt> Which of the following dopamine agonists used in treatment of parkinsonism is available as a transdermal patch but not oral formulation?ApomorphineRopiniroleRotigotinePramipexole  <response>: Both ropinirole and pramipexole are available as orally administered immediate tid and extended-release qd formulations. Rotigotine is administered as a once-daily transdermal patch, and may be useful in managing surgical patients who are NPO. Apomorphine is a dopamine agonist with efficacy comparable to levodopa, but it must be administered parenterally as it is rapidly and extensively metabolized if taken orally. Ref harrison 20th edition page 3127 