Infant PPI Dosing Information

doctor helping a baby with infant acid reflux

This PPI Dosing information page is here to use as a reference and is based on the MarciKids study done at the University of Missouri in the early 1990's. There's extensive evidence in medical literature that suggest different approaches to the dosing of PPI medicines (such as omeprazole, lansoprazole, esomeprazole) in infants (after 4 to 6 weeks of age) and younger children (toddlers) when compared to older children (teens) and adults.  This page talks about the relationship between age and 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.

That's the basis of MarciKids, the study done at the University of Missouri!

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. It is effective in most cases and although MarciKids dosing suggests a base line, there are many cases where the infant will need lower doses and perhaps once or twice a day. But in other instances an infant may benefit from higher, more frequent doses.

For your convenience we have a printable version in PDF form that contains a brief outline of the medical literature that support these treatment suggestions in addition to the doctors and researchers that are successfully applying these treatments. Or you can use this PDF outline of this webpage for your doctor as well.

If you don't have a doctor or would like to hear options for treating your baby's reflux you can connect one of our on staff pediatricians now!

The use of PPI's (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 you MUST space the dosing by 4 hours. And spacing an antacid by one hour is required.

Getting Started with the PPI Dosing Information

We go into depth about the MarciKids principles but ultimately all you really need is your baby’s age and weight. Both can be entered into the MarciKids dosing calculator below to assist you and your medical care team calculate a dose according to the MarciKids data.

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 Dosing Information Terms to Know

PPI stands for proton pump inhibitor. PPI's block the production of acid at the parietal cell where production occurs. PPI’s 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. Most PPI’s in OTC or Rx versions, can be used with TummyCare Max® under the guidance of your physician. 

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?

PPI Dosing Information: How Much Is Enough & Can You Give Too Much?

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).

  • Esomeprazole, found in Nexium®
  • Omeprazole, Prilosec®, Zegerid®
  • Lansoprazole, found in Prevacid® and generic forms
  • Pantoprazole, found in Protonix®

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 my baby?"
The short answer if NO!

What ever the body does not put to use gets passed through the system with no effect.

The Effect Of Half Life On a PPI Dosing Regimen

lansoprazole half life chart as it relates to infants with acid reflux

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. 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 you 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 plauseble that an infant could need 2-3 doses per day.

  • The MarciKids study showed that infants responded best to 2-3 doses a day. This is a reflection of the shorter half-life when compared to adults.

  • It has been shown that infants have a larger Volume of distribution for PPI’s than adults.
  • In general the volume of distribution is often related to the dose needed.
  • The dose directly affects the area under AUC.

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.


PPI Dosing Information Charts and Calculator

When entering the baby's age in the yellow highlighted fields please use actual age and not adjusted age if the baby was born prematurely. Weight should be entered in pounds.

As stated previously, some infants needed higher than MarciKids dosing and some did well on lower doses. You should consider MarciKids dosing as a guide rather than a rule.

You can also refer to the MaciKids Dosing Calculator page for easier access.


Lansoprazole Lansoprazole (Prevacid®) is typically mixed at a 3mg per ml concentration.
 Childs Age  Doses per pound of body weight  Doses per
 day
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


Omeprazole (Prilosec®, Zegerid® and generic forms) and Esomeprazole (Nexium®) All other PPI drugs (Nexium®, Prilosec®, Zegerid® as well as the generic versions of Omeprazole) are typically mixed at a 2mg per ml concentration.
 Childs Age Doses per pound of body weight  Doses per
 day
Under 3 months old 0.7mg of PPI per pound of body weight 3 times per day
3 to 6 months old 0.6mg of PPI per pound of body weight 3 times per day
7 months to 2 years old  0.45mg 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 of PPI per pound of body weight 2 times per day

Titrating Up & Weaning Down

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 with or without  TummyCare Max® 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 PPI’s 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.

Return to Mixing Instructions from the PPI Dosing Information Page

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The following is a list of citations that may be helpful in obtaining more PPI dosing information in children:


*MBCHB, FRCPC, FACG. Decisions in diagnosing and managing chronic gastroesophageal reflux disease in children.  Journal of Pediatrics 2005; 146:3-12
Burnett JE, Balkin ER. Stability and viscosity of a flavored omeprazole oral suspension for pediatric use.
American Journal of Health-Systems Pharmacy 2006; 63:2240-2247.

Clinical studies showing that higher PPI doses are required to achieve healing in pediatric patients are listed here on the PPI dosing information page below. Along with them are the credits for those who participated and published these studies:
Gunasekaran TS, Efficacy and safety of omeprazole for severe gastroesophageal reflux in children. The Journal of Pediatrics 1993; 123:148-154.
Israel D, Shepherd R, et al. Omeprazole for treatment of chronic erosive esophagitis in children: a multi-center study of efficacy, safety, tolerability and dose requirements. The Journal of Pediatrics 2000; 137:800-807.
Iarocci TP, Tan H, Singer, J, Barron J, Pilzer E, Patel D, Bakst A. Proton pump inhibitors in infants.  [Abstract] American Journal of Gastroenterology. 2005; 100(suppl.):S273.

Clinical study of pharmacokinetics of omeprazole in children
Andersson T, Lundborg P, et al. Pharmacokinetics of orally administered omeprazole in children. American Journal of Gastroenterology 2000; 95:3101-3106.
Pharmacokinetic study showing the relationship between lower age and higher dosing requirements in pediatric patients: younger children require higher and/or more frequent doses due to shorter PPI half-life. The first author is employed at Astra (company that makes Prilosec.)

Reviews of PPI use in children: pharmacokinetics, safety, efficacy, and PPI dosing information
Israel DM, Omeprazole and other proton pump inhibitors: pharmacology, efficacy, safety, with special reference to use in children. Journal of Pediatric Gastroenterology and Nutrition. 1998; 27:568-579.
Specifically states that on a per kilogram (weight) basis, children require higher doses of omeprazole than adults due to different pharmacokinetics of omeprazole in children. Discusses at length the use of buffered PPI suspensions in children as a preferred dosage form.
Litalien C, Theoret Y, Faure C. Pharmacokinetics of proton pump inhibitors in children. Clinical Pharmacokinetics 2005; 44:441-466.
Abstracts by Jeffrey Phillips, Pharm.D., describing use of ChocoBase and CaraCream in pediatric patients; includes some PPI dosing information
Phillips JO, Bettag ME, Parsons DS, Wilder B, Metzler MH. Use of flavored lansoprazole or omeprazole suspensions in pediatric GERD. [Abstract A1292] Gastroenterology 2000; 118: 5904.
Phillips JO, Parsons DS, Fitts SW. Flavored lansoprazole suspension in pediatric GERD. [Abstract] Journal of Pediatric Gastroenterology and Nutrition 2000; 31:S181. [Abstract No. 707].

This PPI dosing information and chart and a portion of the textual contents of the PPI dosing information page came from the Marci-kids website.