Watch this video from the creator of MarciKids dosing
The PPI Dosing information page is based on information in the MarciKids study done at the University of Missouri in the early 1990's. It was performed by a group of doctors that specialized in infant acid reflux. The creator and lead in that study was Jeffrey Phillips Pharm. D (Dr. P)
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There's tons of medical literature supporting different approaches to PPI dosing (such as omeprazole, lansoprazole, esomeprazole)
when treating acid reflux in infants and younger children when compared to older children (teens) and adults. This page explains how a child's age and weight, and the half-life (when the drug is most
effective) and how using higher doses, more frequently in in infants
(after 4 to 6 weeks of age) and younger children is more beneficial because babies and younger children metabolize so much more quickly than adults. Three times faster in most cases. That is the basis of the MarciKids study.
The MarciKids study was done by Jeffrey Phillips Pharm. D (Dr. P) and Marcella
Bothwell ENT along with other physicians and nurses. MARCI KIDS
(Midwestern Acid Reflux Children’s Institute) and it's primary focus was to provide PPI dosing information to medical professionals and to those caring for infants with reflux. MarciKids is a reference to this type of dosing and is commonly known in the infant reflux world as MarciKids dosing.
Quick Jump to MarciKids Dosing Calculator
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The use of PPIs (proton pump inhibitors) is a choice for you to consider and it is a personal choice you need to make as a mother, with the guidance of a medical professional that is well versed in effective proton pump inhibitor treatment in infants. In many cases of infants with GERD you or your medical team may want to start with an antacid or an H2 Blocker, such as ranitidine or Zantac®. These are very good options for short term signs of reflux as they tend to build tolerance (tachyphylaxis) so if you see symptoms coming back, this may be the cause.
Also if you are considering the use of an H2 blocker and a PPI combination your doctor should advise you to space the dosing by 4 hours and spacing of an antacid should be recommended by one hour. Your doctor should know this and explain why.
We go into depth about the MarciKids principles but ultimately all you really need is your baby’s age and weight and the guidance of a medical care professional.
So don't let all the technical talk scare you.
This information is merely here to give you an understanding of the principles of MarcKids and is intended to provide information only and is not a dosing recommendation as that must come from your medical care team. We'd also like to stress the importance of reviewing and discussing all infant acid reflux treatment intentions with your doctor and we encourage you to refer anybody in your care provider team to review this website and this page.
PPI stands for proton pump inhibitor. PPIs block the production of acid at the parietal cell where production occurs. PPIs can only block the proton pumps that are active (producing acid). If the pumps aren’t producing acid then the PPI has no effect.
Some products that might sound familiar are Nexium®, Prilosec®, Prevacid®, omeprazole and lanzoprasole.
A Drug regimen is the drug that you take, how much you take per dose, and how often you take it. In addition the length of treatment is part of the regimen. For example, a common drug regimen for adult suffering from acid reflux disease could be Prevacid® (lansoprazole) 30mg twice per day. In this case the dose is 30mg and the dosage interval is twice per day.
Half life is the time required for the drug concentration in the
bloodstream to drop by ½. In many it is used to determine the dosage
interval (number of doses per day) and is measured in minutes or hours.
Volume of distribution relates to how the drug moves into the tissues of the body. It is sometimes used to determine the dosage.
Does that make sense so far?
Note that each of the listed PPI drugs below are currently approved by the FDA for pediatric use. That being said only Nexium is FDA approved in infants (for erosive esophagitis).
PPI drugs have an effect on the production of acid. That effect is related to the amount of drug that is absorbed into the body.
This amount of drug is measured as the AUC or Area Under the Curve. So, when your physician or medical care team are planning out a drug regimen with a PPI drug, the best thing to do is to try to achieve an AUC that is known to be enough of a dose to inhibit acid in twenty four hour and reduce damage and symptoms.
In other words, you have to give enough quantity of the PPI drug and frequently enough to get the desired effect.
Based on the MarciKids study when the dosing regimen of the PPI drug is insufficient your baby could continue to suffer from the symptoms of acid reflux disease. This could potentially be the cause of what is referred to by some moms as the acid battle.
PPI's are very specific in where they work in the body and are only active in a very specific place, the acid secreting portion of a cell called the parietal cell. Since PPI drugs only work on the acid secreting cell they have generally a good safety profile. PPI drugs are known as prodrugs because they are not active in the bloodstream. PPI's only become active when they pass into the acid secreting portion of the parietal cell (the cells in the stomach that make acid). This is important because, we get this question a lot.
"Can I overdose a PPI?"
The short answer if NOT REALLY!
What ever the body does not put to use gets passed through the system with no effect.
Tran A, Rey E, Pons G, Pariente-Khayat A, d'Athis P, Sallerin V, Dupont C. Pharmacokinetic-pharmacodynamic study of oral lansoprazole in children. Clinical Pharmacology and Therapeutics. 2002;71: 359-367.
The graph above shows the half life of lansoprazole compared to age in infants and children. As you can see there is a relationship between age and half life with some degree of variability. This is important to consider because half life effects the AUC and as mentioned AUC has been correlated with acid inhibition in PPI medicines.
Based on this process indicated on this PPI dosing information page, the estimated half-life for this child would be 0.5 hours. Published data indicates that the normal adult has half-life of 1.5 hours for lansoprazole. By dividing the adult half-life of 1.5 hours by this child's half-life of 0.5 hours (as indicated on the table above), we know this child would eliminate the lansoprazole three times faster then the adult.
The average adult takes 1 dose per day (baseline from above) to achieve good acid control, so this one year old child would be expected to need 3 doses per day (3 x 1). So we know that this child will need 3 doses per day. The MarciKids study showed that infants responded best to 3 doses a day because they metabolize so quickly.
Now lets calculate the dose as they did in the study. The amount of PPI is determined by multiplying the volume of distribution and the child's weight. For lansoprazole and omeprazole, research has shown that the V.dist (volume of distribution) is 3 to 3.5 times larger in infants than in adults. The average adult dose is approximately 0.2 mg/pound, therefore,
3 x 0.2 mg/pound = 0.6 mg/pound per dose and
3.5 x 0.2 mg/pound = 0.7 mg/pound per dose
There is variation in the measurement of V.dist in most infants and as such this is an approximation. Some infants or children just require a higher dose to control acid reflux symptoms so there may be times when your doctor would want to increase the milligram (mg) per milliliter (mL) concentration and/or the dose.
If an adult with GERD takes 1-2 dose per day, such as lansoprazole, to achieve symptoms of acid reflux control, it is plausible that an infant could need 2-3 doses per day.
There is variation in the measurement of V.dist in infants that's why this is an approximation. Some infants or children just require a higher dose to control acid reflux symptoms so there may be times when your medical care team would want to increase the milligram (mg) per milliliter (mL) concentration and/or the dose.
| Childs Age|| Doses per pound of body weight|| Doses per |
|Under 3 months old||0.7mg to 0.8mg of PPI per pound of body weight||3 times per day|
|3 to 6 months old||0.6mg to 0.7mg of PPI per pound of body weight||3 times per day|
|7 months to 2 years old||0.45mg to 0.6mg of PPI per pound of body weight||3 times per day|
|2 years old or older||0.45mg of PPI per pound of body weight||2 to3 times per day|
|5 years old or older||0.35mg to 0.45mg of PPI per pound of body weight||2 times per day|
| Childs Age||Doses per pound of body weight|| Doses per |
|Under 3 months old||0.7mg of PPI per pound of body weight||3 times per day|
|3 to 6 months old||0.6 to 0.7mg of PPI per pound of body weight||3 times per day|
|7 months to 2 years old ||0.45 to 0.6mg of PPI per pound of body weight||3 times per day|
|2 years old or older||0.45mg of PPI per pound of body weight||2 to 3 times per day|
|5 years old or older||0.35mg to 0.45mg of PPI per pound of body weight||2 times per day|
Your medical team will also discuss with you an important part of the treatment regimen which is the weaning or discontinuing PPI drugs all together.
Your medical care team may want to start your infant with a lower dose and increase over time as needed. If your medical team decides to begin using a compounded suspension but not seeing improved symptom control from acid reflux disease a higher dose might be prescribed by your physician. As your new prescription will outline this will be accomplished by giving your baby a little more of the PPI suspension at each dosing time. If your baby is experiencing excess gas your physician may find it helpful to have the suspension compounded at a higher mg per ml concentration.
As your physician may discuss with you it may take ten to fourteen days to see the results of a PPI treatment on the symptoms of infant GERD. Be patient, it can take time. This why your physician may want to stay at a specific dose for a period of time.
Some Moms have commented that symptoms can get a little worse before they get better. Parents have referred to this as the acid battle. The acid in the stomach is very high in concentration when starting a proton pump inhibitor medication and a drug regimen. This of course is what's causing the infant acid reflux symptoms. It also causes the biggest difficulty when beginning your infants drug regimen. We get into great detail about this subject on "The Acid Battle" page.
Your doctor may want to wean or titrate your baby up or down from PPIs and may find the information on the weaning page useful. This can assist in the process in making the dosing up process as smooth as possible. Please read about it here on the Weaning page.
If you have any additional questions, please feel free to contact our Our Support Team.