What Are Zomacton 5mg and 10mg?
Zomacton (somatropin) is a recombinant human growth hormone used to treat growth hormone deficiency in children and adults, as well as conditions like Turner syndrome, Prader-Willi syndrome, and idiopathic short stature. The 5mg and 10mg refer to the total strength of somatropin per vial in the lyophilized powder form, which is reconstituted with diluent for injection.[1]
Key Difference: Dosage Strength Per Vial
- Zomacton 5mg vial: Contains 5mg of somatropin per vial. After reconstitution with 1.5mL bacteriostatic water, it yields ~3.33mg/mL concentration, for a total volume of ~1.5mL.
- Zomacton 10mg vial: Contains 10mg of somatropin per vial. After reconstitution with 3mL bacteriostatic water, it yields ~3.33mg/mL concentration, for a total volume of ~3mL.
Both deliver the same concentration per mL once mixed, but the 10mg vial provides double the total drug amount and volume, suiting patients needing higher or more frequent doses.[1][2]
How Dosing Works in Practice
Physicians prescribe based on body weight (typically 0.16-0.24mg/kg/week for children, lower for adults), divided into daily subcutaneous injections.
- A 5mg vial supports smaller or less frequent doses (e.g., ~0.5-1.5mg per injection for lighter patients).
- A 10mg vial is for larger doses (e.g., 2-3mg per injection), reducing reconstitution frequency and waste for heavier patients or long-term use.
Neither is inherently "stronger" per injection—dose volume adjusts to need (e.g., 0.6mL from either vial = ~2mg).[1][3]
Which to Choose and Cost Factors
Selection depends on patient size, treatment duration, and convenience—10mg vials minimize mixing sessions but may lead to waste if doses are small.
- Insurance often covers both similarly, but 10mg vials can be more economical (~$1,000-$2,000 per vial retail, varying by pharmacy; check GoodRx for discounts).
- No generic versions; Ferring Pharmaceuticals manufactures both.[2][4]
Storage and Administration Similarities
Both require refrigeration (2-8°C) post-reconstitution, stable for 21 days. Use 29-31 gauge needles for daily SC injections in thigh, abdomen, or arm. Side effects (e.g., injection site reactions, headache) and monitoring (IGF-1 levels, growth tracking) are identical.[1]
[1]: Zomacton Prescribing Information (Ferring)
[2]: Drugs.com - Zomacton Dosage Guide
[3]: FDA Label for Zomacton
[4]: GoodRx - Zomacton Pricing