We use the patch in the periop. I am surprised her MD advised her to cut the patch in half. It says in the directions for use, not to cut the patch. The patch is made up of several layers. The medication, Scopolamine, is in a small reservoir within the patch. Cutting it will cause the medication to leak out and not be absorbed at a controlled rate.
http://www.transdermscop.com/prescribing-information.htm
DOSAGE AND ADMINISTRATION
Initiation of Therapy: To prevent the nausea and vomiting associated with motion sickness, one Transderm Scōp patch (programmed to deliver approximately 1.0 mg of scopolamine over 3 days) should be applied to the hairless area behind one ear at least 4 hours before the antiemetic effect is required. To prevent post operative nausea and vomiting, the patch should be applied the evening before scheduled surgery. To minimize exposure of the newborn baby to the drug, apply the patch one hour prior to cesarean section. Only one patch should be worn at any time.
Do not cut the patch.