One of the drugs that is prescribed for me to help manage my Parkinson's disease is Rotigotine. Since the causes of Parkinson's are not well defined, all currently approved Parkinson's medication, including Rotigotine, are limited to treating the symptoms. Rotigotine is a dopamine agonist. Wikipedia describes an agonist as: a chemical that binds to a receptor and activates the receptor to produce a biological response. Rotigotine is supplied as transdermal patches, in other words, sticky patches which you stick to your skin so that the drug may be gradually absorbed. Nicotine patches are another type of transdermal patch that you might be more familiar with. If I have understood it correctly, the Rotigotine molecules have a similar shape to dopamine which means that, once they enter the blood supply, they can bind to the same receptors as dopamine (i.e. the dopamine receptors). I think their shape also means that our brains ...