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Use of mefloquine in children - a review of dosage, pharmacokinetics and tolerability data
Malaria Journal volume 10, Article number: 292 (2011)
Use of anti-malarial medication in children is hampered by a paucity of dosage, pharmacokinetic and tolerability data.
Data on the use of mefloquine in children, particularly in young children weighing less than 20 kg, were reviewed using PubMed literature and reports on file.
Chemoprophylaxis data: Two studies with a total of 170 children were found. A simulated mefloquine plasma profile showed that doses to achieve protective chemoprophylaxis blood concentration of mefloquine of approximately 620 ng/mL (or 1.67 μmol/L) in children should be at least 5 mg/kg. This simulated plasma profile in children corresponds to that seen in adult travellers using a weekly prophylaxis dose of 250 mg. This reinforces current practice of using weight-based dosage for children. Clearance per body weight is higher in older children. For children who travel to malaria risk areas tablets can be broken and crushed as required. It is necessary to disguise the bitter taste of the drug.
Treatment data: Mefloquine treatment (alone or in combination) data are available for more than 6000 children of all age and weight categories. The stereoselectivity and pharmacokinetic profile of mefloquine in children is similar to that observed in adults. There is higher clearance in older children (aged 5-12 years) compared to younger children (aged 6-24 months). Mefloquine treatment is well tolerated in infants (5-12 kg) but vomiting is a problem at high doses. This led to the use of a "split dose" regimen with 15 mg/kg initially, followed 12 hours later by 10 mg/kg.
Mefloquine 125 mg has been used as intermittent preventive treatment (IPT) and was found to be efficacious in reducing episodes of malaria in a moderate-transmission setting but vomiting was a problem in 8% of children aged 2-11 months.
Mefloquine is also used as a component of artemisinin combination therapy (ACT) in small children. The combination artesunate plus mefloquine is a WHO approved first-line treatment for uncomplicated malaria in Africa.
Currently available data provide a scientific basis for the use of mefloquine in small children in the chemoprophylaxis setting and as a part of treatment regimens for children living in endemic areas.
More than 900 million international arrivals were registered in 2008 and it is estimated that 7-10% of all travellers are children. Plasmodium falciparum malaria in a young child is a life threatening disease. Early symptoms are often atypical and difficult to recognise and in non-immune children who travel to malaria endemic areas, life-threatening complications can occur within hours of the initial symptoms . Parents are advised not to travel to malaria endemic areas with small children but in reality, children comprise one in 10 of all travellers. It is essential to prevent malaria with personal protection measures and the use of an effective chemoprophylaxis in high-risk areas.
Currently, the majority of European countries, the United States of America (USA), Australia, Japan and other industrialised countries are classified as malaria non-endemic but need guidelines and effective prevention for travellers. Overall, in Europe, between 15% and 20% of all imported malaria cases are in children. An analysis of more than 17,000 cases of imported paediatric malaria  showed that P. falciparum was the dominant imported species in children and that more than 75% of all paediatric cases with known place of acquisition were acquired in Africa. At highest risk are children of immigrant families visiting friends and relatives (VFR), particularly those travelling to sub-Saharan Africa, because they tend to visit high-risk destinations for prolonged periods, they lack immunity and often do not use chemoprophylaxis or preventive measures  and travel medicine needs to target this group of travellers . The high cost of some anti-malarial medication is also a prohibitive factor for many VFR families. Malaria is thus a real threat to tourist and child expatriates visiting or living in malaria endemic areas.
All age groups of child travellers need prophylaxis including breast-fed infants, small children through to older children until young adults aged 18 years old. Mefloquine is an effective drug for malaria prevention in Africa and has the convenience of once weekly administration. There is however some uncertainty regarding the dosage of mefloquine for chemoprophylaxis in very young children and this topic is addressed here.
There is also a need for a concise overview on data regarding mefloquine treatment in children, particularly those aged < 5 years, who live in endemic areas and who bear the main burden of malaria. It has been estimated that 80% of malaria deaths occur in young children in Sub Saharan Africa. Mefloquine has been used recently in Africa for intermittent preventive treatment (IPTi) of malaria in infants and as a component of artemisinin combination treatment (ACT).
This review presents a summary of pharmacokinetic, dosing and tolerability data on the use of mefloquine chemoprophylaxis and treatment in children.
Synthesis of evidence
The data presented here were compiled from searches of PubMed through January 30th, 2011 using the search terms (alone or in combination) "mefloquine" and "children", "pharmacokinetics", "dosage", "safety" or "tolerability", "adverse event", "efficacy". The authors also searched their own documentation and obtained data on file from F. Hoffmann-La Roche previously submitted to Health Authorities.
A total of 445 papers in English, French or German were screened for data, particularly for data on mefloquine use in small children (< 20 kg). Data from 41 studies were included in the tables and manuscript. The quality of the papers chosen was not assessed i.e. the selection was not restricted to randomised, double-blind studies. All studies were included that were judged to have clinically useful data on dosage, pharmacokinetics and tolerability in small children. All regimen dosages and combinations with other medication were considered. A compilation table of international guidelines on the use of mefloquine chemoprophylaxis and stand-by treatment for children visiting malaria endemic areas was also created to reflect expert opinion in the travel medicine context worldwide.
Discussion of reviewed data
Pharmacokinetic basis for the dosage regimen of weekly mefloquine chemoprophylaxis
The use of anti-malarial chemoprophylaxis in children is hampered by a lack of pharmacokinetic data and paediatric drug formulations. This is because small children are routinely excluded from many clinical studies due to the need for continuous sampling that is needed to determine drug concentration-time profiles. An intensive review of the literature and data on file (Table 1) revealed two studies on the use of mefloquine chemoprophylaxis in 170 children including young children weighing less than 20 kg and over 20 kg  (Table 1).
Some prophylaxis data on file on the use of mefloquine (in the form of the combination Fansimef®) is valuable in the evidence synthesis. The use of mefloquine at therapy doses has been widely evaluated in infants and supports the limited available pharmacokinetic data in the chemoprophylaxis setting (Tables 2 and 3).
A first study on mefloquine in a prophylactic setting (as a component of Fansimef ®) includes a simulated plasma profile using maintenance doses of 62.5 mg weekly mefloquine (n = 70) equivalent to ¼ of a tablet, the currently recommended chemoprophylactic dose in small children weighing 10-20 kg (Figure 1). This dosage leads to a blood concentration of mefloquine of approximately 620 ng/mL (or 1.67 μmol/L) which is considered effective against P. falciparum malaria [6, 7]. The plasma profile in children (Figure 1), simulated for a period of 16 weeks, corresponds to that seen for adult travellers (Figure 2) using weekly prophylaxis doses of 250 mg mefloquine [6, 7]. Weekly 62.5 mg mefloquine or 125 mg mefloquine every two weeks (in the form of Fansimef®) was effective as malaria prophylaxis and well tolerated even in the children weighing < 20 kg (Table 1).
To date, classic pharmacokinetic studies with multiple sampling and concentration time profiles during chemoprophylaxis have not been performed in small children but this is the situation with many available malaria chemoprophylaxis medications due to the need for continuous sampling.
For children who travel to malaria risk areas tablets can be broken or cut with a blade and crushed as required. It is necessary to disguise the bitter taste of the drug using chocolate or sweet yoghurt. There are no data available on the stability of mefloquine in crushed or broken tablets and cutting of the tablets is probably best done just prior to administration.
A second study in older Kenyan school children aged 9-14  showed lower than expected trough levels of mefloquine after standard doses (mean 406 ng/mL after six weeks of chemoprophylaxis), which is in agreement with the Singhasivanon studies from the early 90's [8, 9] that showed greater clearance of mefloquine in older children.
Position of international expert groups with regard to mefloquine chemoprophylaxis
This pivotal position of mefloquine in the prevention of malaria in small children who travel to malaria endemic areas is reflected in the international guidelines (Table 4). The major authorities, such as WHO, CDC, DTG, UK, French and Canadian expert groups recognise mefloquine as a valuable chemoprophylaxis for small children weighing < 20 kg. For some high-risk travellers visiting friends and relatives (VFR) in their country of origin, mefloquine offers the only option for an effective, well-tolerated, chemoprophylaxis for their small children who travel to high risk malaria areas in Africa. The expert groups vary in their guidelines particularly with regard to the lower weight limit for the use of mefloquine.
Mefloquine treatment in children
Data were found on mefloquine treatment in more than 6,000 children of all ages and weights (Tables 1, 3) in Asia and Africa and data on the treatment of imported malaria in children in Marseille, France (Table 3). In these studies, mefloquine was used either alone or in combination with other anti-malarials. These findings indicate a predictable pharmacokinetic profile of mefloquine in children, which is similar to the pharmacokinetic profile of the drug observed in adults (i.e. mean absorption half-life of 2.1 hours, peak blood concentration after about 17 hours, slow systemic clearance, long elimination half-life - mean 18.1 days). The main age related difference in pharmacokinetics is that clearance per body weight is higher in older children aged 5-12 years compared to younger children aged 6 to 24 months [8, 9]. A detailed pharmacokinetic study in infants with a mean weight of 9.5 kg showed that the stereoselectivity of mefloquine in children is similar to that observed in adults  which means that after administration of the racemic mixture, the pharmacokinetics at steady state are dominated by the (-) enantiomer as is the case with adults.
Efficacy and tolerability of mefloquine treatment in children
Many of the early mefloquine treatment studies, prior to the year 2000 (Table 3) were conducted in children living in an area of multi-drug resistant malaria on the Thai-Myanmar border. These studies monitor the decline in the efficacy of mefloquine monotherapy in this area over time. Increasing the dose from 15 to 25 mg/kg extended the therapeutic life of the drug in the region. Currently in multiple drug resistant areas in South East Asia, monotherapy is no longer recommended by the WHO and ACT is seen as the only option. Mefloquine 25 mg/kg combined with artesunate has been extensively evaluated in recent years [11–16] (Table 2). In Africa, many countries have moved away from mono-therapy and the WHO Malaria Treatment Guidelines 2010 (2nd edition)  recommend the combination therapy "artesunate plus mefloquine" as a first line treatment for uncomplicated malaria in Africa. The combination of a fast-acting artemisinin derivative, such as artesunate, with an anti-malarial that has sustained activity, such as mefloquine, is now an accepted approach for malaria treatment in endemic areas.
Luxemburger et al reported on the use of mefloquine in more than 500 children under the age of 5 years including a total of 102 infants aged less than 30 months and weighing from five to 12 kg. This study focused on efficacy and tolerability of treatment doses of mefloquine and found that vomiting was a problem at high doses (25 mg/kg) in small children which lead to the split dosage regimen 15 mg/kg initially, followed by 10 mg/kg > 12 hours later. Otherwise, no serious toxicity was associated with mefloquine therapy (at high doses compared to low doses recommended for chemoprophylaxis) and in particular no major neuropsychiatric abnormalities were detected. The authors concluded that mefloquine (25 mg/kg) was very well tolerated in small children weighing > 5 kg except for vomiting. Vomiting of malaria treatment is important due to reduced oral bioavailability and possible subsequent treatment failure. Mefloquine related vomiting was investigated in detail between 1990 and 1995 in Thailand [19–21]. The investigators found that 30% of children aged less than 2 years vomited after high dose mefloquine treatment (25 mg/kg) but that vomiting could be reduced by 40% when the split dose regimen (15 mg/kg initially, followed by 10 mg/kg > 12 hours later) was used. It was possible to reduce mefloquine-associated vomiting by 50% by giving mefloquine on the second day in combination with artesunate. The authors concluded that high dose mefloquine was well tolerated when given as a split dose.
A more recent four-arm study of intermittent preventive treatment of malaria in infants (IPTi) in Africa compared mefloquine (125 mg), chlorproguanil (15 mg) plus dapsone (18.75 mg), sulfadoxine (250 mg) plus pyrimethamine (12.5 mg) and placebo. Mefloquine was the most efficacious drug in reducing the incidence of clinical episodes of malaria in infants but caused vomiting in 8% of children receiving this regimen .
With regard to tolerability, a recent paper  evaluated neurological and neuropsychiatric adverse events associated with artesunate-mefloquine combination treatment in young African children. Some 220 children (weighing between 10 and 20 kg) were treated with a fixed combination of artesunate (50 mg/day) and mefloquine (125 mg/day). The investigators used a standardized neurological assessment battery and found a low incidence of neurological and neuropsychiatric adverse events in small children < 20 kg who received this combination therapy. Some 50 neurological and neuropsychiatric events occurred in 28 children and 11 events in 8 patients were considered treatment related. Sleeping disorders were reported for 2.3% of children, neurological disorders in 1.4%, neuropsychiatric disorders in 1% and eating disorders in 0.5% of the children. Adverse events were of mild to moderate intensity and resolved spontaneously. In an earlier study of very young Karen children in South East Asia, neither mefloquine nor artesunate resulted in significant impairment of behavior or motor function when compared with non-febrile controls .
There is an evidence base for the use of mefloquine both in paediatric chemoprophylaxis and in the treatment of paediatric malaria. The findings of the treatment studies done in children < 20 kg indicate a predictable pharmacokinetic profile of mefloquine in children which is similar to that observed in adults. The main age related difference in pharmacokinetics is that clearance per body weight is higher in older children aged 5-12 years compared to younger children aged 6 to 24 months. Stereoselectivity of mefloquine in children is similar to that observed in adults. Tolerability of mefloquine in small children appears superior to that in adults except for vomiting at high therapy doses, which can be mitigated by using a split dose. Two studies show a low percentage of self-limiting neurological and neuropsychiatric adverse events in children treated with artesunate/mefloquine ACT.
There are few data on chemoprophylaxis in small children but these suggest that the blood/plasma profile of mefloquine in small children is similar to that seen in adults. This dosage (for chemoprophylaxis) for children who travel to malarious areas should be at least 5 mg/kg to achieve mefloquine protective levels of 620 ng/ml in the endemic region. This reasoning is followed by expert groups in travel medicine such as the WHO with the recommendations that dosage schedules should be based on weight and that mefloquine may be given to infants of more than 5 kg body weight. There are no data on the stability of crushed or broken tablets and cutting of the tablets is probably best done just prior to administration. The bitter taste of mefloquine chemoprophylaxis should be disguised to increase adherence.
Conflict of interest statement
This paper is based on a regulatory update done by F. Hoffmann-La Roche. PS was the external consultant who received consultancy fees for preparing the regulatory update. PS has also received research funding from Glaxo Smith Klein, F. Hoffmann-La Roche and Pfizer. PS has received speaker's honoraria from Glaxo Smith Klein, F. Hoffmann-La Roche and sigma-tau. MA, LR, MTS, SB, HGR are employees of F. Hoffmann-La Roche, Basel, Switzerland
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PS was responsible for the concept, design, acquisition of data, analysis, interpretation of the data and writing the manuscript. MA, LR, MTS, SB, HGR contributed to data acquisition, intellectual input and critically revised the paper. All authors have seen and approved the final version.
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Schlagenhauf, P., Adamcova, M., Regep, L. et al. Use of mefloquine in children - a review of dosage, pharmacokinetics and tolerability data. Malar J 10, 292 (2011) doi:10.1186/1475-2875-10-292
- Small Child
- Artemisinin Combination Treatment