What Is Zomacton? Uses, Dosage, and What You Need to Know in 2026

Zomacton is a prescription growth hormone medication manufactured by Ferring Pharmaceuticals. It contains somatropin — a recombinant (lab-made) version of human growth hormone that is biologically identical to the growth hormone produced naturally by the pituitary gland. Zomacton has been used to treat growth conditions in pediatric patients since 1995, and received FDA approval for adult growth hormone deficiency in January 2018.

This guide answers the most common questions patients and families have when first learning about Zomacton.

What Is Zomacton Used For?

Zomacton is FDA-approved to treat the following conditions:

In children (pediatric patients):

• Growth failure due to inadequate secretion of endogenous growth hormone (growth hormone deficiency, or GHD)
• Short stature associated with Turner syndrome
• Idiopathic short stature (ISS) — children who are significantly shorter than expected with no identifiable medical cause, when height standard deviation score (HSDS) is ≤ -2.25
• Short stature or growth failure due to SHOX deficiency
• Short stature due to being born small for gestational age (SGA) with no catch-up growth by ages 2 to 4

In adults:

• Replacement of endogenous growth hormone in adults with growth hormone deficiency (GHD)

Is Zomacton a Controlled Substance?

No. Zomacton is not a controlled substance. It is a prescription-only biologic medication, but it is not classified by the DEA as a Schedule II, III, IV, or V controlled substance. This means:

• Refills can be written on the same prescription (up to the number of refills authorized by your doctor)
• Prescriptions can be called in or faxed electronically (no requirement for paper prescriptions, as with Schedule II drugs)
• There are no DEA-mandated quantity limits or early refill restrictions specific to controlled substance scheduling

What Form Does Zomacton Come In?

Zomacton comes as a sterile, white, freeze-dried (lyophilized) powder in two vial sizes:

• 5 mg vial — co-packaged with bacteriostatic 0.9% sodium chloride (0.9% benzyl alcohol). Must be used within 14 days after mixing. Also available with the ZOMA-Jet needle-free device.
• 10 mg vial — co-packaged with bacteriostatic water (0.33% metacresol). Must be used within 28 days after mixing.

Both formulations are given by subcutaneous (under the skin) injection. The vials must be refrigerated (36–46°F / 2–8°C) before and after reconstitution and must never be frozen.

How Is Zomacton Dosed?

Dosing for Zomacton is individualized by your doctor based on your weight, diagnosis, and IGF-1 blood levels.

Pediatric dosing (weekly, divided into daily injections):

• Growth hormone deficiency (GHD): 0.18–0.3 mg/kg/week
• Turner syndrome: Up to 0.375 mg/kg/week
• Idiopathic short stature: Up to 0.37 mg/kg/week

Adult dosing:

• Start approximately 0.2 mg/day (range 0.15–0.3 mg/day); increase every 1-2 months by 0.1–0.2 mg/day based on clinical response and IGF-1 levels
• Women taking oral estrogen and elderly patients may need dose adjustments

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How Is Zomacton Given?

Zomacton is given by subcutaneous injection — injection just under the skin. Preferred injection sites are the back of the upper arm, abdomen, buttock, or thigh. Rotation of injection sites is essential to prevent lipoatrophy (fat tissue loss) at any single site.

Before injecting, the powder must be reconstituted (mixed) with the liquid diluent provided. The mixture should be gently swirled — never shaken — to dissolve. Do not use if the solution is cloudy or contains particles.

How Long Do You Take Zomacton?

For pediatric patients treated for growth failure, Zomacton is typically continued until the growth plates (epiphyses) close — signaling that linear growth is complete. For most children, this happens in late adolescence, but timing varies. Treatment is discontinued once the growth plates have fused.

For adults with GHD, Zomacton is typically a long-term or lifelong treatment that helps maintain body composition, energy levels, and metabolic health. Patients who were treated for childhood GHD and whose epiphyses are now closed should be reevaluated before continuing as an adult.

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Where Can I Fill My Zomacton Prescription?

Zomacton is dispensed exclusively through specialty pharmacies. If you're unsure which specialty pharmacy near you can fill your prescription, medfinder can call pharmacies on your behalf and text you results.

To understand how Zomacton works in the body, see: How Does Zomacton Work? Mechanism of Action Explained.