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Drug Interactions between Alka-Seltzer Fruit Chews (Antacid) and Malarone Pediatric

This report displays the potential drug interactions for the following 2 drugs:

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Interactions between your drugs

Moderate

calcium carbonate proguanil

Applies to: Alka-Seltzer Fruit Chews (Antacid) (calcium carbonate) and Malarone Pediatric (atovaquone / proguanil)

ADJUST DOSING INTERVAL: The concomitant administration of magnesium trisilicate may significantly reduce the bioavailability of proguanil by reducing its absorption. Therapeutic failure may result. Other antacids and absorbent antidiarrheals may also interact with proguanil.

MANAGEMENT: Antacids or antidiarrheals and proguanil should be taken at least 2 to 3 hours apart.

References

  1. "Multum Information Services, Inc. Expert Review Panel"
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0

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Drug and food interactions

Moderate

calcium carbonate food

Applies to: Alka-Seltzer Fruit Chews (Antacid) (calcium carbonate)

ADJUST DOSING INTERVAL: Administration with food may increase the absorption of calcium. However, foods high in oxalic acid (spinach or rhubarb), or phytic acid (bran and whole grains) may decrease calcium absorption.

MANAGEMENT: Calcium may be administered with food to increase absorption. Consider withholding calcium administration for at least 2 hours before or after consuming foods high in oxalic acid or phytic acid.

References

  1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  2. Canadian Pharmacists Association "e-CPS. http://www.pharmacists.ca/function/Subscriptions/ecps.cfm?link=eCPS_quikLink" (2006):
  3. Cerner Multum, Inc. "Australian Product Information." O 0
  4. Agencia Española de Medicamentos y Productos Sanitarios Healthcare "Centro de información online de medicamentos de la AEMPS - CIMA. https://cima.aemps.es/cima/publico/home.html" (2008):
  5. Mangels AR "Bone nutrients for vegetarians." Am J Clin Nutr 100 (2014): epub
  6. Davies NT "Anti-nutrient factors affecting mineral utilization." Proc Nutr Soc 38 (1979): 121-8
View all 6 references

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Moderate

atovaquone food

Applies to: Malarone Pediatric (atovaquone / proguanil)

ADJUST DOSING INTERVAL: Food, particularly high-fat food, significantly enhances the oral absorption and bioavailability of atovaquone. In 16 healthy volunteers, administration of a single 750 mg dose of atovaquone suspension following a standard breakfast (23 g fat: 610 kCal) resulted in an approximately 3.4-fold increase in the mean peak plasma concentration (Cmax) and a 2.5-fold increase in the mean area under the plasma concentration-time curve (AUC) of atovaquone compared to administration following an overnight fast. In a study consisting of 19 HIV-infected volunteers receiving atovaquone suspension 500 mg/day, Cmax and AUC of atovaquone increased by 72% and 66%, respectively, in the fed state relative to the fasting state.

MANAGEMENT: To ensure maximal oral absorption, atovaquone products (suspension, tablet, or in combination with proguanil) should be administered with a meal or milky drink, or enteral nutrition at the same time(s) each day. Because plasma atovaquone concentrations have been shown to correlate with the likelihood of successful treatment and in some cases, survival, alternative therapies may be appropriate for patients who have difficulty taking atovaquone with food.

References

  1. "Product Information. Mepron (atovaquone)." Glaxo Wellcome PROD (2001):
  2. "Product Information. Malarone (atovaquone-proguanil)." Glaxo Wellcome PROD (2001):
  3. Wohlt PD, Zheng L, Gunderson S, Balzar SA, Johnson BD, Fish JT "Recommendations for the use of medications with continuous enteral nutrition." Am J Health Syst Pharm 66 (2009): 1438-67

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Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

See also

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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