Patient Leaflet Updated 21-Jul-2026 | Ferring Pharmaceuticals Ltd
Zomacton 4mg Injection
ZOMACTON®
4 mg, powder and solvent for solution for injection
Somatropin
1. What ZOMACTON is and what it is used for
2. What you need to know before you use ZOMACTON
3. How to use ZOMACTON
4. Possible side effects
5. How to store ZOMACTON
6. Contents of the pack and other information
ZOMACTON contains the active substance, somatropin also known as growth hormone. Growth hormone is produced naturally in the body. It has an important role in growth. ZOMACTON contains somatropin made in a pharmaceutical manufacturing facility.
ZOMACTON is used for the long-term treatment of:
Talk to your doctor or pharmacist before using ZOMACTON.
Please tell your doctor or pharmacist if you are using, have recently used or might use any other medicines, including medicines obtained without prescription.
In particular, inform your doctor if you are taking or have recently taken any of the following medicines. This is because doctor may need to adjust the dose of ZOMACTON or of the other medicines:
There is no experience from use in pregnant woman. ZOMACTON must not be used during pregnancy. It is not known whether ZOMACTON passes over into breastmilk. ZOMACTON must not be used during breast-feeding.
ZOMACTON has no or negligible influence on the ability to drive or use machines.
The solution contains benzyl alcohol 9 mg/ml.
Due to the presence of benzyl alcohol as excipient, ZOMACTON may cause toxic reactions and allergic reactions in infants and children up to 3 years old and must not be given to premature babies or neonates.
Always use this medicine exactly as your doctor has told you. Check with your doctor or pharmacist if you are not sure.
Your doctor or nurse will normally decide with you, the most suitable method of administration and provide dosage instructions according to the method used. Your doctor or nurse will tell you the correct dose for you. The dose is administered subcutaneously (under the skin) with a syringe or with the needle device Ferring Pen.
Growth hormone deficiency in children:
Your doctor will calculate the precise dose for you, based on your bodyweight. Generally, a dose of 0.17 - 0.23 mg per kg bodyweight per week is recommended. This weekly amount may be divided into six or seven doses, corresponding to a daily dose of 0.02 - 0.03mg per kg bodyweight. The maximum recommended weekly dosage is 0.27 mg per kg bodyweight corresponding to daily injections of up to about 0.04mg per kg bodyweight.
Turners Syndrome (females only):
Your doctor will calculate the precise dose for you, based on your bodyweight. Generally, a dose of 0.33 mg per kg bodyweight per week is recommended. This weekly amount may be divided into six or seven doses, corresponding to a daily dose of 0.05 mg per kg bodyweight.
The powder should only be dissolved with the solvent provided.
Two concentrations can be prepared depending on the volume of solvent used. Your doctor will tell you which strength to use.
Reconstitution should be performed in accordance with good practice rules, particularly in the respect of asepsis.
1. Hands should be washed
2. a. Fit the needle onto the graduated syringe.
b. Remove the plastic top on the vial.
c. Wipe the top of the vial with an alcohol swap. Do not touch the rubber stopper after cleaning.
3. Snap off the top of the solvent ampoule. Remove the plastic cover on the needle. Make sure that the plunger is completely pushed in before introducing the needle into the ampoule.
Slowly draw up the required volume in the syringe.
4. Place the needle into the centre of the clean rubber stopper and into the vial and inject the solvent slowly into the vial aiming the stream of liquid against the glass wall in order to avoid foam.
5. The vial must then be swirled with a gentle rotary motion until the contents are completely dissolved in order to obtain a clear and colourless solution.
Since the powder mainly contains proteins, shaking or vigorous mixing is not recommended.
If after mixing, the solution is cloudy or contains particles, the vial and its contents should be disposed of.
In case of cloudiness after refrigeration, the solution should be allowed to warm up to room temperature (25°C). If cloudiness persists or coloration appears, dispose of the vial and its contents.
The solution should be used within 14 days after reconstitution if stored in a refrigerator.
Any unused solution in the vial should be disposed of at the end of the 14-day storage period.
The clear, colourless solution should then be administered subcutaneously as you have shown at the clinic using either a syringe or Ferring Pen.
Following reconstitution the following steps should be performed for injection
1. Hands should be washed
2. The top of the vial should be wiped with an alcohol swab to prevent contamination of the content. Do not touch the rubber stopper after cleaning.
3. Turn the vial upside down keeping the top of the needle below the surface of the medication. Gently pull back on the plunger until your prescribed amount of medication fills the syringe. If you do not have enough medication for a full dose, reconstitute a new vial to make up the difference.
4. With the needle still in the upside down vial, gently tap the syringe to loosen any air bubbles
5. Remove the needle from the vial and carefully replace the needle cap until ready to inject
6. Thoroughly clean the injection site with an alcohol swab
7. Check that the correct dose is in the syringe
8. Remove the needle cap and hold the syringe the way you hold a pencil
9. With your free hand, gently pinch the skin around the injection site between your fingers
10. Insert the needle into the tissue beneath the skin’s surface at a 45° to 90° angle to reduce discomfort
11. Holding the syringe in place, pull back (if there is blood in the syringe, it means you have entered a blood vessel. Do not inject ZOMACTON. Withdraw the needle, discard all supplies, and go back to step 1. Choose and clean a new injection site). If no blood appears, slowly push the plunger until the syringe is empty
12. Quickly pull the needle straight out and apply pressure to the site of injection with a sterile gauze pad. Throw away the needle and syringe in your sharps disposable container
Do not share your syringes, needles, or vials with anyone else. You may give them an infection or get one from them.
Any unused product or waste material should be disposed of in accordance with local requirements.
The Ferring pen (a needle device) is not provided in the packaging.
Specific instructions for the use of the Ferring pen are given in a brochure supplied with the device.
An overdose may cause hypoglycaemia (low blood sugar), followed by hyperglycaemia (high blood sugar).
In the event of an overdose, contact the doctor or nearest hospital casualty department at once. The effects of repeated overdosing are unknown.
In the event of a missed dose, do not worry. Carry on as usual and administer the next dose at your usual time.
You may experience hypoglycaemia (low blood sugar level). Although the long-term effectiveness of the treatment will not be affected, you should consult your doctor if this happens.
Like all medicines, this medicine can cause side effects, although not everybody gets them.
The subcutaneous administration of growth hormone may lead to an increase or decrease of fat at the site of administration. It is therefore recommended to frequently change the site of administration. On rare occasions, patients develop pain and an itchy rash at the site of administration.
Very commonly reported side effects (may affect more than 1 in 10 people)
Adults only:
Commonly reported side effects (may affect up to 1 in 10 people):
Children and Adults:
Children only:
Adults only:
Uncommon reported side effects (may affect up to 1 in 100 people)
Children and Adults:
Children only:
Adults only:
Rarely reported side effects (may affect up to 1 in 1,000 people):
Children and Adults:
Children only:
Very rarely reported side effects (may affect up to 1 in 10,000 people):
Children only:
Frequency not known (cannot be estimated by established data)
Children only:
If you get any side effects, talk to your doctor or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card Scheme, website: https://yellowcard.mhra.gov.uk or search for MHRA Yellow Card in the Google Play or Apple App Store. By reporting side effects you can help provide more information on the safety of this medicine.
Keep this medicine out of the sight and reach of children.
Do not use this medicine after the expiry date which is stated on the packaging. The expiry date refers to the last day of that month.
Store in a refrigerator at 2°C - 8°C; keep in the outer carton in order to protect it from light.
After reconstitution, the solution may be stored for a maximum of 14 days in a refrigerator (2°C - 8°C). Store the vial in an upright position.
Any unused solution in the vial should be disposed of at the end of 14-day storage period.
In case of cloudiness after refrigeration, the solution should be allowed to warm up to room temperature (25°C). If cloudiness still persists, or coloration appears, dispose of the vial and its contents.
Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how throw away medicines you no longer use. These measures will help protect the environment.
The active substance is somatropin: 4 mg in a vial, corresponding to a concentration of 1.3 mg/ml or 3.3 mg/ml after reconstitution.
The other ingredients are:
Powder: Mannitol
Solvent: Benzyl alcohol, sodium chloride and water for injections.
ZOMACTON contains less than 1 mmol sodium (23 mg) per dose, so it is essentially “sodium-free”.
ZOMACTON is a powder and solvent for solution for injection.
Powder in a vial (4mg somatropin) and solvent in an ampoule (3.5ml) in two different pack types:
Not all pack sizes may be marketed.
The powder is white to off white in colour. After reconstitution, the solution is clear and colourless.
This medicine is authorised in the Member States of the European Economic Area and in the United Kingdom (Northern Ireland) under the following names:
ZOMACTON: Belgium, Denmark, Finland, Greece, Luxembourg, Netherlands, Spain, Sweden, United Kingdom (Northern Ireland)
ZOMACTON 4 mg: France, Germany, Netherlands
This leaflet was last revised in February 2026.
ZOMACTON, Ferring and the Ferring Pharmaceuticals logo are trademarks of Ferring
Drayton Hall, Church Road, West Drayton, UB7 7PS, UK
+44 (0)844 931 0051
http://www.ferring.co.uk
+44 (0)844 931 0050
0800 111 4126