Unknown: The cause of pseudotumor cerebri is uknown. It has been associated with implantable contraceptive devices, such as the Norplant and Mirena iud, which contain levonorgestrel. Plan b consists of a dose of Levonorgestrel to prevent pregnancy. There are not studies showing direct causation. Discuss with the clinicians taking care of the condition before using this medication.
Answered 9/13/2017
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