... to switch from Hizentra due to insurance change. I infuse 40ml every other day. I have only donefirst two infusions and for both pre med with benydryl and tylenol. I get groggy (not from benydryl- do nothave that issue only 25mg) and in 3 hrs I need to sleep an hour. Headaches and nauseousness. Howlong to adjust or do I hav eto give up gammragard Liquid subq