IVIG treatment must be prescribed by a physician. IVIG is administered, typically by a registered nurse, as an infusion into a vein (intravenous) or just under the skin (subcutaneous IVIG), a process that typically takes several hours. IVIG infusions may be administered in a variety of dosages to treat Alzheimer's. Current dosing is based on body weight and is typically given as an infusion every 2 weeks, every 4 weeks, or every month depending on physician's orders. Keep in mind that research into the dosing and frequency is in its early stages. Physicians prescribing IVIG treatment for Alzheimer's disease have used a variety of doses generally falling between 1-2 grams of IVIG per kilogram of body weight.