After intravenous administration, human normal immunoglobulin is immediately and completely available with relatively rapid distribution to plasma and extravascular fluid. Within approximately 3 to 5 days, a balance is achieved between the intra- and extravascular compartments. IgG and IgG complexes are degraded in the cells of the reticuloendothelial system and are subsequently taken up by the body and incorporated into other proteins or catabolized. Therefore, IgGs are not metabolized by hepatic enzymes or excreted by the kidneys or liver.
No differences in pharmacokinetic properties are expected in pediatric patients. Current evidence shows that the pharmacokinetic profile of pediatric patients (>3 years) is quite similar to that of adults. Data on pharmacokinetics in younger children are lacking
A summary of the pharmacokinetic (PK) parameters listed in the SmPCs of the licensed products
Age
3-18 years
t½ (days) mean*
33,9
Cmax (g/l) mean
14,2
Vd (l) mean
4,57
Total Cl (l/dag), mean
0,088
* The half-life may vary from patient to patient, especially in primary immunodeficiency.
dose recommendation of formulary compared to licensed use (on-label versus off-label)
Little literature is available on the use of immunoglobulins in rejection after kidney transplants. Various dosage schemes are around in the Netherlands, including: 1-2 g/kg one-time only, spread over several days if needed. In the study by Billing, 1 g/kg/week was given for 4 weeks (m=20, combined with 1 dose of rituximab).
Little literature is available on the use of immunoglobulins in rejection after kidney transplants. Various dosage schemes are around in the Netherlands, including: 1-2 g/kg one-time only, spread over several days if needed. In the study by Billing, 1 g/kg/week was given for 4 weeks (m=20, combined with 1 dose of rituximab).
In PID/SID patient receiving a maintenance dose < 0.53 g/kg every 3-4 weeks: increase dose once to 0.53 g/kg. This should yield a serum level > 240 mIE/ml measles antibodies for at least 22 days.
Renal impaiment in children > 3 months
Cases of acute renal insufficiency have been reported in patients who are on IVIg therapy. In cases of reduced renal function, discontinuing the administration of IVIg should be considered.
In children with a risk of renal impairment, the infusion rate must not be higher than 4.8 ml/kg/hour.
The complete list of all undesirable drug reactions can be found in the national Summary of Product Characteristics (SmPC) – click here
Side effects in children
Side effects rarely occur when intravenous immunoglobulins are administered. Fever, problems with joints, nausea, vomiting, infusion reaction and exanthema have been reported. Anaphylactic responses are rare and occur above all in patients with IgA deficiency or antibodies against IgA.
In infants and young children with fructose intolerance (that has not yet been diagnosed), the excipient sorbitol can cause a reaction that can sometimes be fatal. Some types of blood glucose meters incorrectly interpret the excipient maltose as glucose.
The most common side effect in children and adolescents is headache [SmPC Octagam]. After applying maltose containig IVIg glycosuria ocurred in children and adolescents. Maltose is hydrolysed to glucose in renal tubules and gets reabsorbed. Capacity of reabsorbtion is age dependent [SmPC Ig Vena]. Indications for high IVIG doses in children (especially children with Kawasaki disease) are associated with a higher reporting rate of hemolytic reactions [SmPC Privigen].
The complete list of all contra-indications can be found in the national Summary of Product Characteristics (SmPC) – click here
Contra-indications
No information available on specific contra indications in children.
The complete list of all warnings and precautions can be found in the national Summary of Product Characteristics (SmPC) – click here
Warnings & precautions in children
Side effects can largely be prevented by running the infusion in more slowly. An immunologist should be consulted if there are IgA antibodies.
Interactions
The complete list of all interactions can be found in the national Summary of Product Characteristics (SmPC) – click here
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