TM Owner Endo Pharmaceuticals
Supprelin LA 50mg Implant
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Indications & Clinical Uses
- Supprelin LA 50 mg is a subcutaneous implant containing histrelin acetate, a gonadotropin-releasing hormone (GnRH) agonist, used to treat children with central precocious puberty (CPP) - early, medically confirmed onset of secondary sexual characteristics with advancing bone age.
- A single implant, placed under the skin of the inner upper arm by a trained healthcare provider under local anaesthesia, continuously suppresses the pituitary-gonadal hormone surge for up to 12 months, after which it is removed and, if treatment is still needed, replaced with a new implant.
- Supprelin LA is indicated in both boys and girls once the diagnosis of central (not peripheral) precocious puberty is confirmed.
- It is a specialist paediatric endocrinology treatment, not self-administered, and is not intended for adult use or other forms of early puberty.
- Do not confuse it with GnRH agonists dosed as monthly injections; the implant gives steady release without repeated dosing.
Side Effects
- Supprelin LA has no boxed warning on its current US label.
- The most common effects, seen in roughly half of patients, are reactions at the implant site - bruising, pain, soreness, redness or swelling - which usually settle within days.
- During the first few weeks, the initial hormone surge can temporarily worsen puberty signs, including menstrual-like bleeding in girls, before suppression takes effect; this normally resolves within about four weeks.
- Psychiatric changes such as emotional instability, irritability, anger and aggressive behaviour have been reported and should be discussed with the treating physician.
- Convulsions have occurred, particularly in children with a seizure history, epilepsy, brain abnormalities, or taking medicines that lower seizure threshold.
- Seek prompt medical review for a hard lump, infection signs, or the implant breaking through or migrating from the insertion site, and for any new or worsening mood or behavioural change.
Precautions & Warnings
- Supprelin LA is contraindicated in patients hypersensitive to GnRH or GnRH agonist analogues and must not be used in pregnancy.
- The implant must be inserted and removed only by a healthcare provider trained in the procedure, and its presence should be confirmed if expected puberty suppression is not achieved, since an implant can occasionally be incompletely retained or migrate.
- Regular monitoring of LH, FSH, sex-steroid levels, growth rate and bone age is required to confirm ongoing suppression and appropriate timing of removal or replacement.
- Use caution in children with a history of seizures or CNS disorders because of the reported risk of convulsions.
- There is no evidence on use in adults, and Supprelin LA does not treat peripheral (non-central) precocious puberty, so the underlying cause of early puberty must be confirmed as GnRH-dependent before starting treatment.
Avoid Interactions
- No formal drug-interaction studies have been conducted with Supprelin LA.
- Because histrelin suppresses pituitary-gonadal function, it can alter the results of hormone-based diagnostic tests, so clinicians should be told the child is using this implant before ordering hormone assays.
- Medicines that lower the seizure threshold may add to the seizure risk reported with GnRH agonist implants and should be reviewed by the prescriber.
- There are no known food interactions.
- Because central precocious puberty treatment is long-term, parents should tell every healthcare provider - including dentists and other specialists - about the implant, and mention any new prescription, over-the-counter medicine, herbal product or supplement the child starts, so the care team can watch for unexpected effects on mood, behaviour or seizure risk during treatment.
References
Frequently Asked Questions
Supprelin LA (histrelin acetate) treats central precocious puberty in children - early puberty caused by the brain switching on too soon. The implant suppresses the hormones driving early sexual development, and works for both boys and girls once a doctor confirms the central cause.
A doctor inserts one Supprelin LA implant under the skin of the upper arm using local anaesthesia. It's not a tablet or injection you give at home. One implant works for up to 12 months, then it's removed and replaced if treatment continues.
The most common effect of Supprelin LA is soreness, bruising or swelling where the implant sits, affecting about half of children. Puberty signs can briefly worsen in the first weeks before improving. Tell the doctor about any mood changes, aggression, or seizures.
Watch for a hard lump, redness, or the implant breaking through the skin at the insertion site, and for new irritability, aggression or seizures, since Supprelin LA has been linked to both. It must not be used during pregnancy.
Your child's doctor will check LH, FSH and sex-hormone blood levels, growth rate and bone age regularly while using Supprelin LA. This confirms the implant is still suppressing puberty hormones and helps decide exactly when it needs removing or replacing.
One Supprelin LA implant suppresses puberty hormones for up to 12 months. After that, a doctor removes it and, if treatment should continue, inserts a new implant at the same visit; it is not designed to be left in longer.
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