SPRINGFIELD, Mo. — A federal judge has denied a Bayer motion to exclude the testimony of four experts in three actions by plaintiffs alleging the Mirena birth control device caused them to develop idiopathic intercranial hypertension.

Plaintiffs Sarah Hoover, Sadie Miller and Stephanie Sellers reportedly allege they developed idiopathic intercranial hypertension (also known as IIH or pseudotumor cerebri) as a result of their use of the intrauterine device Mirena.

According to HarrisMartin Publishing, the plaintiffs accuse Bayer of ignoring evidence linking IIH to birth control devices such as Mirena and failing to warn Mirena users of the association.

Bayer attempted to block the testimony of Dr. Rosa Tang, Dr. Frederick Fraunfelder, Dr. David Ross and Dr. John Maggio by arguing that they are unqualified to offer their opinions and utilized an unreliable metholody to reach their conclusions. Bayer contended that they “have no training in epidemiology, the medical field that specializes in assessing causal relationships” and, aside from Tang, “do not have the relevant experience with IIH.”

Judge Stephen R. Bough ruled that the experts, while not epidemiologists, are qualified to testify because they have the requisite knowledge and experience with IIH.

IIH is caused by fluid building up in the skull and not being able to be released or absorbed at a proper rate. Diagnosed by spinal tap, IIH can manifest as severe headaches, nausea and ringing in the ears, among other symptoms. It can also cause swelling of the optic nerves, leading to temporary or permanent blindness.

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