Hizentra Infusion: A Complete Patient Guide to Subcutaneous Ig Therapy at Home

Hizentra is a 20% subcutaneous immunoglobulin (SCIg) therapy that patients self-administer at home using a small infusion pump. Approved by the FDA for primary immunodeficiency (PI) and chronic inflammatory demyelinating polyneuropathy (CIDP), Hizentra delivers steady immune support through weekly infusions under the skin — avoiding the peaks and valleys that can come with monthly IV treatments.

If you have been told that Hizentra might be right for you — or you are already using it and want to get more out of your infusions — this guide covers everything from how the pump works to practical tips that experienced patients wish they had known from the start.

What Is Hizentra and Who Is It For?

Hizentra is a liquid solution containing concentrated human immunoglobulin G (IgG) antibodies — the same infection-fighting proteins your body would normally produce. The “20%” means that 20 grams of IgG are dissolved in every 100 milliliters of solution, making it one of the more concentrated subcutaneous immunoglobulin products available.

The FDA has approved Hizentra for two conditions:

• Primary Immunodeficiency (PI): A group of over 400 genetic disorders in which the immune system does not produce enough protective antibodies. Patients with PI need ongoing immunoglobulin replacement to fight infections.
• Chronic Inflammatory Demyelinating Polyneuropathy (CIDP): An autoimmune condition that damages the protective covering of nerves, causing progressive weakness and numbness. Hizentra helps modulate the immune system to slow this damage.

Many patients switch to Hizentra after receiving intravenous immunoglobulin (IVIG) in a clinical setting. The appeal? Independence. Instead of spending hours at an infusion center every few weeks, you infuse at home on your own schedule.

How the Hizentra Infusion Pump Works

Unlike IVIG, which drips directly into a vein, Hizentra is pushed slowly into the fatty tissue just beneath the skin using a small mechanical or electronic pump. Here is what a typical infusion session looks like:

1. Prepare the supplies. Let the Hizentra vial reach room temperature (about 20-30 minutes). Gather your pump, tubing, needle sets, antiseptic wipes, and gauze.
2. Draw up the medication. Using a syringe, transfer the prescribed volume from the vial into the pump syringe or reservoir.
3. Select and clean infusion sites. Common areas include the abdomen, thighs, upper arms, and hips. Clean each site with an antiseptic wipe.
4. Insert needle sets. Most patients use 1-4 needle sites per session, depending on the total volume. Subcutaneous needles are short (typically 6-12 mm) and much thinner than IV needles.
5. Start the pump. The pump delivers Hizentra at a controlled rate, usually starting slow and increasing as tolerated. A typical infusion takes 1-2 hours.
6. Remove and dispose. After the infusion is complete, remove the needle sets and apply a bandage. Dispose of sharps properly.

Typical Dosing Schedule

Hizentra is generally infused once per week, though some doctors prescribe it every two weeks or even daily for smaller doses (called “frequent dosing”). The weekly schedule is what sets it apart from IVIG, which is typically given every 3-4 weeks.

Your dose is calculated based on your body weight and the IgG levels your doctor wants to maintain. A common starting point for PI patients is roughly 0.2 to 0.4 grams per kilogram of body weight per month, divided into weekly doses. For a 70 kg (154 lb) patient, that might mean 14-28 grams per month, or about 3.5-7 grams per weekly infusion.

Why does the weekly schedule matter? Because it keeps your IgG levels remarkably steady. With monthly IVIG, your antibody levels spike right after the infusion and then decline before the next one — a roller coaster that can leave you feeling worse in the days before your next dose. Weekly Hizentra smooths that curve, and many patients report more consistent energy and fewer infections as a result.

Infusion Sites and Rotation

Where you place the needles matters more than many patients realize. The tissue under the skin can only absorb so much fluid at once, and repeatedly using the same spot can lead to hardened areas, lumps, or reduced absorption.

Best Practices for Site Rotation

• Map your sites. Think of your abdomen and thighs as a grid. Move to a different quadrant each week so no single area gets used more than once a month.
• Keep a log. Many patients use a simple body diagram printed on paper or a smartphone app to track which sites they have used recently.
• Space needle sites at least 2 inches apart from each other and at least 2 inches from the navel, any scars, or bony areas.
• Alternate sides. If you infused on the left side of your abdomen last week, use the right side this week.

Over time, experienced patients develop a rotation routine that becomes second nature. If you notice persistent redness, hardness, or dimpling at any site, skip that area and let it recover for several weeks. Mention it to your doctor as well — they may want to adjust your volume per site or infusion rate.

Common Side Effects and How to Manage Them

Most Hizentra side effects are local — meaning they happen at the infusion site — and tend to improve over the first few weeks of treatment. According to Mayo Clinic, common side effects include:

• Local site reactions: Redness, swelling, itching, or mild pain at the needle site. These are the most common and usually resolve within 24-48 hours.
• Headache: Particularly in the first few infusions. Staying well-hydrated before and after can help.
• Fatigue: Some patients feel tired on infusion day.
• Nausea or digestive discomfort: Mild and typically short-lived.

Practical Tips for Reducing Site Reactions

• Apply a warm compress to the infusion site for 10-15 minutes before inserting the needle. This increases blood flow and helps the tissue absorb the fluid more easily.
• Slow down the rate. If site swelling is bothersome, ask your nurse trainer whether reducing the pump speed would help. A slower rate usually means less local swelling.
• Apply a topical antihistamine cream (like diphenhydramine) to the site after the infusion if itching is persistent. Ask your pharmacist for recommendations.
• Gently massage the infusion area after removing the needle to help distribute the fluid.

Storing Hizentra

Hizentra should be stored at room temperature (up to 77 degrees F / 25 degrees C) and protected from light. Do not freeze it. Once a vial is opened, use it immediately or within the time frame your pharmacist specifies — typically within 4 hours. Check the expiration date on every vial before use.

Because it does not require refrigeration, Hizentra is easier to travel with than some other immunoglobulin products. Pack it in a carry-on bag when flying (along with a letter from your doctor), and avoid leaving it in a hot car.

Cost and Insurance Considerations

Immunoglobulin therapy is among the most expensive treatments in medicine. The cost of Hizentra varies depending on your dose, but patients can expect the wholesale price to range from $3,000 to $10,000 or more per month before insurance. Fortunately, most commercial insurance plans and Medicare cover Hizentra for approved indications, though the specifics — copays, deductibles, and prior authorization requirements — vary widely.

A few practical steps to manage costs:

• Ask your specialty pharmacy about copay assistance programs. The manufacturer (CSL Behring) offers financial support for eligible patients through their IgIQ program.
• Understand whether your plan covers Hizentra under the medical benefit or pharmacy benefit. This distinction affects your out-of-pocket costs and which pharmacy can dispense it.
• If you receive a denial, do not accept it as final. Insurance coverage for immunoglobulin is often approved on appeal with proper documentation.

For patients exploring the transition from IV to subcutaneous therapy, the article on switching from IVIG to SCIg covers what to expect during the changeover period.

Is Hizentra Right for You?

Not every immunoglobulin patient is a candidate for Hizentra. Good candidates generally:

• Are comfortable with self-injection or willing to learn
• Prefer the flexibility of home infusion over clinic visits
• Experience significant peaks and valleys with monthly IVIG
• Have adequate subcutaneous tissue for needle insertion
• Can commit to a weekly schedule

If weekly infusions feel like too much, consider asking your doctor about Hyqvia, another subcutaneous option that allows monthly dosing. The best choice depends on your lifestyle, your diagnosis, and how your body responds to treatment.