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4 Interactions found for:

Singulair and Flonase
Interactions Summary
  • 1 Major
  • 0 Moderate
  • 3 Minor
  • Singulair
  • Flonase

Drug Interactions

No drug interactions were found for selected drugs: Singulair, Flonase.

This does not necessarily mean no interactions exist. Always consult your healthcare provider.

Drug and Food Interactions

No food interactions were found for selected drugs: Singulair, Flonase.

This does not necessarily mean no interactions exist. Always consult your healthcare provider.

Drug and Pregnancy Interactions

The following applies to the ingredients: Fluticasone Nasal (found in Flonase)

Professional Content

This drug should be used during pregnancy only if the benefit outweighs the risk to the fetus.

AU TGA pregnancy category: B3
US FDA pregnancy category: Not assigned

Comments:
-There is insufficient data on use in pregnant women to know this drugs risks.
-Animal studies showed characteristic corticosteroid teratogenicity (decreased fetal weight and/or skeletal malformations) at maternotoxic doses of fluticasone [5 times, equal to, and under the maximum recommended human daily intranasal dose (MRHDID)].
-Intranasal inhalation of a dose equivalent to the MRHDID (a maternotoxic dose) decreased fetal weights in rats but showed no teratogenicity.
-Oral corticosteroid experience suggests rodents are more prone to corticosteroid teratogenic effects than humans.
-Hypoadrenalism may occur in infants born of mothers receiving corticosteroids during pregnancy.

Corticosteroids have been shown to be teratogenic in rats and mice with subcutaneous administration throughout organogenesis; at a maternotoxic fluticasone dose about 5 times the maximum recommended human daily intranasal dose (MRHDID) omphalocele, decreased weight, and skeletal malformations were seen in rats. The no observed adverse effect level (NOAEL) in rats is about equal to the MRHDID. At the equivalent MRHDID dose cleft palate and skeletal variations were seen in mice. The mouse NOAEL is about 0.3 times the MRHDID. Rats dosed by intranasal inhalation only throughout organogenesis had decreased body weight and skeletal variations at doses equivalent to the MRHDID (a maternotoxic dose). Rabbits given 0.06 times the MRHDID (a maternotoxic dose) subcutaneously during organogenesis had decreased pup weight; cleft palate occurred at 0.39 times the MRHDID but not teratogenicity, the NOAEL was about 0.01 times the MRHDID. Fluticasone crossed the placenta after oral and subcutaneous administration in rodents. Rats dosed at up to 2 times the MRHDID from late gestation (gestation day 17) through lactation (day 22 postpartum) showed no effect on pup weight, developmental landmarks, learning, memory, reflexes or fertility. There are no adequate studies in pregnant women. Fluticasone was detected in neonatal cord blood after drug inhalation by the parent. The background birth defect and miscarriage risk for the indicated population is not known. In the US general population, the estimated major birth defect risk is 2 to 4% and the miscarriage risk is 15 to 20%.


AU TGA pregnancy category B3: Drugs which have been taken by only a limited number of pregnant women and women of childbearing age, without an increase in the frequency of malformation or other direct or indirect harmful effects on the human fetus having been observed. Studies in animals have shown evidence of an increased occurrence of fetal damage, the significance of which is considered uncertain in humans.

US FDA pregnancy category Not Assigned: The US FDA has amended the pregnancy labeling rule for prescription drug products to require labeling that includes a summary of risk, a discussion of the data supporting that summary, and relevant information to help health care providers make prescribing decisions and counsel women about the use of drugs during pregnancy. Pregnancy categories A, B, C, D, and X are being phased out.

References

  1. "Product Information. Flonase (fluticasone)." Glaxo Wellcome PROD (2001):
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  3. Cerner Multum, Inc. "Australian Product Information." O 0

The following applies to the ingredients: Montelukast (found in Singulair)

Professional Content

The manufacturer makes no recommendation regarding use during pregnancy.

AU TGA pregnancy category: B1
US FDA pregnancy category: Not assigned

Comments:
-Available data from decades of studies have not established a drug-associated increase in major birth defects when used during pregnancy.
-Animal studies at up to 110 times the maximum recommended human daily oral dose administered during organogenesis did not show adverse developmental effects.
-Poorly or moderately controlled asthma increases maternal risk and the risk of adverse perinatal outcomes (e.g. preeclampsia, prematurity, low birth weight, small for gestational age).

Animal studies of oral administration during organogenesis at up to 110 times the maximum recommended human daily oral dose did not cause any averse developmental effects. Human data from prospective and retrospective cohort studies have not identified an increase in major birth defects when this drug was used during pregnancy; limitations of the studies include small sample size, retrospective data collection, and inconsistent comparator groups. There are no controlled data in human pregnancy. The background birth defect and miscarriage risk for the indicated population is not known. In the US general population, the estimated major birth defect risk is 2 to 4% and the miscarriage risk is 15 to 20%.

AU TGA pregnancy category B1: Drugs which have been taken by only a limited number of pregnant women and women of childbearing age, without an increase in the frequency of malformation or other direct or indirect harmful effects on the human fetus having been observed. Studies in animals have not shown evidence of an increased occurrence of fetal damage.
US FDA pregnancy category Not Assigned: The US FDA has amended the pregnancy labeling rule for prescription drug products to require labeling that includes a summary of risk, a discussion of the data supporting that summary, and relevant information to help health care providers make prescribing decisions and counsel women about the use of drugs during pregnancy. Pregnancy categories A, B, C, D, and X are being phased out.

References

  1. "Product Information. Singulair (montelukast)." Merck & Co., Inc PROD (2001):
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  3. Cerner Multum, Inc. "Australian Product Information." O 0
  4. Sarkar M, Koren G, Kalra S, et al. "Montelukast use during pregnancy: a multicentre, prospective, comparative study of infant outcomes." Eur J Clin Pharmacol 65 (2009): 1259-64
  5. "Product Information. Montelukast Sodium (montelukast)." Ajanta Pharma USA (2016):

Drug and Breastfeeding Interactions

The following applies to the ingredients: Fluticasone Nasal (found in Flonase)

Professional Content

Benefit should outweigh risk.

Excreted into human milk: Unknown
Excreted into animal milk: Yes

Comments:
-There is no information regarding this drug on the presence in human milk, the effects on a breastfed infant, or effects on milk production.
-Other steroids have been detected in low concentrations in human milk.
-Consider the developmental and health benefits of breastfeeding along with the mother's clinical need for this medication as well as any potential adverse effects from this drug or the underlying maternal condition.

Measurable milk levels were seen after subcutaneous administration of 10 mcg/kg/day of titrated fluticasone propionate to lactating rats.

References

  1. "Product Information. Flonase (fluticasone)." Glaxo Wellcome PROD (2001):
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  3. Cerner Multum, Inc. "Australian Product Information." O 0

The following applies to the ingredients: Montelukast (found in Singulair)

Professional Content

The manufacturer makes no recommendation regarding use during lactation.

Excreted into human milk: Yes

Comments:
-A published study reports presence of this drug in human milk.
-Available data do not suggest significant risk of adverse events in the infant from exposure through breast milk or direct exposure.
-There is no information regarding this drug on the effects on milk production.
-Consider the developmental and health benefits of breastfeeding along with the mother's clinical need for this medication as well as any potential adverse effects from this drug or the underlying maternal condition.

References

  1. "Product Information. Singulair (montelukast)." Merck & Co., Inc PROD (2001):
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  3. Cerner Multum, Inc. "Australian Product Information." O 0
  4. "Product Information. Montelukast Sodium (montelukast)." Ajanta Pharma USA (2016):

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.

Switch to: Professional Interactions

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.

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