PDgrowth® Pre-filled Syringe

Pharmaceutical form

– Solution for injection: Sterile – Clear – Colorless – Without visible particles

– Supplied as a single-use pre-filled syringe

– Each pre-filled syringe contains somatropin 4 IU/0.4 mL

– Pack size: six pre-filled syringes

Qualitative Composition

– Active substance: Somatropin

– Excipients: Histidine, Mannitol, Poloxamer 188

Guidance to patients

PDgrowth^® Pre-filled Syringe is intended for subcutaneous administration. The product should be used according to the physician’s prescription and after appropriate instruction by healthcare professionals.

The injection site should be rotated at each administration to reduce the risk of local tissue changes. The syringe is for single use only. Any remaining solution should be discarded after administration.

The product should not be used if the syringe is damaged, if the cap is missing or improperly attached, or if the solution is cloudy, discolored, or contains visible particles.

Somatropin-containing products have no known effect on the ability to drive or operate machinery.

In case of overdose, medical advice should be sought immediately. Short-term overdose may result in hypoglycemia followed by hyperglycemia and fluid retention. Long-term overdose may lead to clinical features of acromegaly or gigantism.

If a dose is missed, the patient should consult the physician regarding the next dose. A double dose should not be administered to make up for a missed dose.

Use

PDgrowth^® is used in pediatric patients for the treatment of growth disorders associated with:

1. Absent or severely reduced growth hormone production.

2. Turner syndrome.

3. Reduced kidney function.

4. Short stature in children born small for gestational age.

5. Noonan syndrome.

In adults, PDgrowth^® is used as growth hormone replacement therapy in patients with growth hormone deficiency that has continued from childhood or developed during adulthood due to tumors, tumor treatment, or diseases affecting the gland responsible for growth hormone production.

Dosage and administration

The dose should be determined by the treating physician and individualized according to body weight, body surface area, height, sex, clinical response, tolerability, and serum IGF-1 concentration, where appropriate.

PDgrowth^® should be administered by subcutaneous injection once daily, preferably at night before bedtime, unless otherwise prescribed by the physician.

Recommended pediatric dose ranges include:

– Growth hormone deficiency: 0.025–0.035 mg/kg/day or 0.7–1.0 mg/m²/day
– Turner syndrome: 0.045–0.067 mg/kg/day or 1.3–2.0 mg/m²/day
– Chronic kidney disease: 0.050 mg/kg/day or 1.4 mg/m²/day
– Small for gestational age: 0.035 mg/kg/day or 1.0 mg/m²/day
– Noonan syndrome: 0.066 mg/kg/day; in some patients, 0.033 mg/kg/day may be sufficient

In adults with growth hormone deficiency continuing from childhood, the recommended starting dose is generally 0.2–0.5 mg/day, followed by dose adjustment according to clinical response and serum IGF-1 concentration.

In adult-onset growth hormone deficiency, treatment is usually initiated at a lower dose, typically 0.1–0.3 mg/day, and gradually increased at monthly intervals according to clinical response and adverse reactions. Serum IGF-1 may be used as a guide for dose adjustment.

Women, particularly those receiving oral estrogen therapy, may require higher doses than men. Dose requirements generally decrease with age. Maintenance doses vary between patients but rarely exceed 1.0 mg/day.

Treatment should not be discontinued without medical advice.

Contraindications

PDgrowth^® Pre-filled Syringe should not be used in the following conditions:

1. Hypersensitivity to somatropin or any excipient of the product.
2. Kidney transplantation.
3. Active tumor or cancer; treatment should be initiated only after the tumor is inactive and anti-tumor therapy has been completed.
4. Acute critical illness, such as complications following open-heart surgery, abdominal surgery, multiple accidental trauma, or acute respiratory failure.
5. Closed epiphyses in patients without growth hormone deficiency.

Warning and Precautions

Before initiating PDgrowth^® therapy, caution is required in patients with diabetes, previous malignancy or tumor, recurrent headache, visual disturbance, nausea or vomiting, abnormal thyroid function, kidney disease, scoliosis, limping, or concomitant glucocorticoid replacement therapy.

Scoliosis may progress during periods of rapid growth; therefore, patients should be monitored during treatment. New-onset limping or hip/knee pain should be evaluated promptly.

Thyroid function and kidney function may require regular monitoring. Patients receiving glucocorticoid replacement therapy may require dose adjustment.

PDgrowth^® may be associated with pancreatitis. Severe abdominal or back pain should be evaluated promptly.

Clinical experience is limited in patients older than 60 years and in adults treated with somatropin for more than 5 years.

Pregnancy and breast-feeding

Somatropin-containing products are not recommended in women of childbearing potential who are not using effective contraception.

If pregnancy occurs during treatment, treatment should be discontinued and the physician should be informed immediately.

PDgrowth^® should not be used during breast-feeding, as somatropin may pass into breast milk.

Side Effects

Like all medicines, PDgrowth^® may cause adverse reactions, although not all patients experience them.

Adverse reactions reported in children and adults include hypersensitivity reactions, symptoms suggestive of increased intracranial pressure such as headache, visual disturbances, nausea or vomiting, reduced serum thyroxine, and hyperglycemia. Anti-somatropin antibody formation, increased liver enzymes, leukemia, and recurrence of brain tumors have also been reported; however, no causal relationship with somatropin has been established.

In children, reported adverse reactions include injection-site reactions, gynecomastia, rash, muscle or joint pain, peripheral edema, hip or knee pain, and limping. In patients with Turner syndrome, increased growth of hands and feet relative to height and a higher risk of ear infections with high-dose somatropin have been reported.

In adults, reported adverse reactions include peripheral edema, headache, paresthesia, joint pain or stiffness, myalgia, type 2 diabetes mellitus, carpal tunnel syndrome, pruritus, injection-site pain, muscle stiffness, and gynecomastia.

Drug Interactions

Dose adjustment or monitoring may be required when PDgrowth^® is used concomitantly with glucocorticoids, cyclosporine, insulin, thyroid hormones, gonadotropins, anticonvulsants, oral estrogen, or other sex hormones.

Monitoring

During treatment with PDgrowth^®, monitoring may include growth response, serum IGF-1, thyroid function, blood glucose, symptoms of intracranial hypertension, scoliosis progression, hip or knee pain, renal function, tumor recurrence, and adverse reactions.

Mechanism of action

Somatropin acts by binding to growth hormone receptors on target cells and activating intracellular signaling pathways. Many of its growth-promoting and anabolic effects are mediated through IGF-1, which is produced in response to growth hormone receptor activation.

Somatropin stimulates linear and skeletal growth in children and contributes to protein synthesis, lipolysis, and metabolic regulation.

Preparation and injection

PDgrowth^® Pre-filled Syringe is administered by subcutaneous injection.

Before administration, the syringe and solution should be inspected carefully. The product should not be used if the syringe is damaged, if the cap is missing or improperly attached, or if the solution is cloudy, discolored, or contains visible particles.

The pre-filled syringe may be kept in its original package at room temperature for approximately 30 minutes before injection to make administration more comfortable. The cap should not be removed until the product is ready for injection.

Recommended injection sites include the front middle area of the thigh, the outer upper arm when administered by another person, or the abdomen at least 5 cm away from the navel. Injection into areas with redness, inflammation, bruising, wounds, cuts, or irritation should be avoided.

The needle should be inserted vertically at a 90-degree angle, and the injection should be performed slowly and steadily. The injection site should not be massaged after administration.

Storage

Store in a refrigerator at 2°C–8°C. Do not freeze.

Keep the product in the original package to protect it from light. Do not expose to direct sunlight, heat sources, or warm water to bring the product to room temperature.

Do not shake vigorously. Keep out of the sight and reach of children.

Do not use after the expiry date printed on the carton and syringe label.

Discard any remaining solution after use.

Do not use if the solution is cloudy, discolored, or contains visible particles.