Saizen Is a Prescription Growth Hormone Used to Treat Growth Hormone Deficiency in Children and Adults

Saizen (Somatropin) is a recombinant human growth hormone — a lab-made version of the growth hormone your pituitary gland naturally produces. If your body doesn't make enough on its own, Saizen replaces what's missing.

This guide covers everything you need to know about Saizen in 2026: what it's used for, how it's taken, who shouldn't take it, and what it costs.

What Is Saizen?

Here are the basics:

• Brand name: Saizen
• Generic name: Somatropin (rDNA origin)
• Drug class: Recombinant Human Growth Hormone (rhGH)
• Manufacturer: EMD Serono (a business of Merck KGaA, Darmstadt, Germany)
• First FDA approval: Originally approved for pediatric growth hormone deficiency, later expanded to include adult GHD
• Controlled substance: No. Saizen is not a DEA-scheduled controlled substance, though it does require a prescription

Saizen contains 191 amino acids and is structurally identical to the growth hormone your body makes naturally. It's produced using recombinant DNA technology — meaning it's made by genetically engineered cells, not extracted from human tissue.

What Is Saizen Used For?

Saizen is FDA-approved for the following conditions:

Pediatric Growth Hormone Deficiency

The most common use. Children whose bodies don't produce enough growth hormone may experience significantly slower growth than their peers. Saizen helps restore normal growth velocity when given as a daily injection.

Adult Growth Hormone Deficiency

Adults can develop GHD either as a continuation of childhood-onset deficiency or as a new condition caused by:

• Pituitary tumors or surgery
• Hypothalamic disease
• Radiation therapy to the brain
• Traumatic brain injury

In adults, GHD can cause fatigue, increased body fat (especially around the midsection), decreased muscle mass, reduced bone density, and impaired quality of life. Saizen helps improve body composition, energy levels, and overall well-being.

Off-Label Uses

Some providers prescribe growth hormone off-label for anti-aging purposes or body composition improvement, but these uses are not FDA-approved. Using growth hormone for athletic performance enhancement is prohibited by the World Anti-Doping Agency (WADA).

How Is Saizen Taken?

Saizen is given as a subcutaneous injection (under the skin). It's not available as a pill, patch, or cream. Here's what you need to know about taking it:

Dosage Forms

• 5 mg vial — Lyophilized (freeze-dried) powder for reconstitution
• 8.8 mg vial — Lyophilized powder for reconstitution
• 8.8 mg click.easy — A reconstitution device that simplifies mixing
• 8.8 mg with Saizenprep — Another reconstitution device option

How to Prepare and Inject

1. Reconstitute the powder with bacteriostatic water for injection (contains 0.9% benzyl alcohol)
2. Gently swirl — don't shake — until dissolved
3. Draw up your prescribed dose
4. Inject subcutaneously into the abdomen, thigh, buttock, or upper arm
5. Rotate injection sites to avoid tissue damage

Important for neonates: The bacteriostatic water diluent contains benzyl alcohol and should not be used for newborns. Sterile water for injection should be used instead.

Typical Dosing

• Children: 0.18 mg/kg/week, divided into daily or 6-times-weekly injections
• Adults (weight-based): Starting dose of 0.005 mg/kg/day, may increase to 0.01 mg/kg/day
• Adults (non-weight-based): Starting dose of approximately 0.2 mg/day, adjusted by 0.1-0.2 mg every 1-2 months based on response and IGF-1 levels

Your endocrinologist will determine the right dose for you based on your lab results, age, weight, and how you respond to treatment. For more about how Saizen works in your body, see our detailed explainer.

Who Should Not Take Saizen?

Saizen is contraindicated in the following situations:

• Active cancer (malignancy) — Growth hormone can stimulate cell growth, including cancer cells
• Acute critical illness — Patients with complications from open heart surgery, abdominal surgery, multiple trauma, or acute respiratory failure should not take somatropin (associated with increased mortality)
• Closed epiphyses — For pediatric growth indications, Saizen should not be used after growth plates have closed
• Active diabetic retinopathy — Proliferative or severe non-proliferative diabetic retinopathy
• Known allergy — Hypersensitivity to somatropin or any excipients in Saizen
• Active intracranial tumor — Evidence of tumor progression or recurrence
• Prader-Willi syndrome with risk factors — Severe obesity, history of upper airway obstruction, sleep apnea, or unidentified respiratory infection

Always tell your doctor about all your medical conditions, including any history of cancer, diabetes, scoliosis, or pituitary disorders.

How Much Does Saizen Cost?

Saizen is expensive. Here's what to expect in 2026:

• Cash price: $700-$1,500+ per vial depending on strength
• 5 mg vial: Approximately $737-$900
• 8.8 mg vial: Approximately $1,150-$1,500
• Monthly cost: $800 to $3,000+ depending on your dose
• With GoodRx coupons: Prices may start around $287

Insurance Coverage

Most insurance plans cover growth hormone therapy but require prior authorization. You'll need documented proof of GHD through provocative stimulation testing. Many plans use step therapy and may prefer certain brands (like Norditropin or Omnitrope) over Saizen. Specialty pharmacy dispensing is almost always required.

Ways to Save

There are several options for reducing your Saizen costs:

• EMD Serono patient support programs — Co-pay assistance for commercially insured patients
• Patient assistance programs — Free medication for qualifying uninsured or underinsured patients
• Prescription Hope — Offers Saizen for $70/month through their patient assistance service
• Coupon cards — GoodRx and other discount card programs

For a complete breakdown, see our guide on how to save money on Saizen.

Final Thoughts

Saizen is a well-established growth hormone therapy that's been helping children and adults with GHD for decades. It's effective, but it requires commitment — daily injections, regular monitoring, and navigating specialty pharmacy logistics.

If you're considering Saizen, start by talking to an endocrinologist. Learn about the potential side effects, understand the drug interactions, and know your options for finding a prescribing doctor. And when you're ready to fill your prescription, Medfinder can help you find a pharmacy with Saizen in stock.