Abstract
This case-control study suggests that previous use of the oral contraceptive pill (OCP) in women may increase the risk of subsequent Parkinson's. There is no demonstrable effect conveyed by previous post-menopausal hormone replacement therapy. It is worth pointing out that 4 previous reports have considered an association between the oral contraceptive pill and subsequent Parkinson's. One showed a decreased risk of Parkinson's in previous users of the OCP, two studies showed no association at all and one showed a minor risk increase but only if there was over 5 years of OCP use. In summary, any link remains uncertain and more work is required.
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