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Asthma effects about 10% of pregnant women worldwide. About 10% of these will have severe disease requiring oral corticosteroids. Brief reviews of asthma drugs are shown below.
The trade names (if available) and molecular weights (rounded to the nearest whole number) are shown in parentheses. Nearly all of these drugs will cross the placenta.
Beclomethasone (Beconase AQ) (539)
Either beclomethasone or budesonide was considered the inhaled steroids of choice for use during pregnancy, according to a position statement from a joint committee of the American College of Obstetricians and Gynecologists and the American College of Allergy, Asthma, and Immunology published in 2000. Although the drug is teratogenic in animals, no human reports associating the use of inhaled beclomethasone with human congenital anomalies have been found.
Benralizumab (Fasenra) (150,000)
There is no published human pregnancy data. Based on studies in monkeys, the drug crosses the placenta in the third trimester. It caused no fetal harm in monkeys when given throughout pregnancy. There is a pregnancy exposure registry that monitors pregnancy outcomes in women exposed to the drug during pregnancy. Health care providers can enroll patients or encourage patients to enroll themselves by calling 1-877-311-8972 or visiting mothertobaby.org/Fasenra.
Budesonide (Rhinocort) (431)
Either budesonide or beclomethasone was considered the inhaled steroids of choice for use during pregnancy in a position statement from a joint committee of ACOG and ACAAI published in 2000. Although the drug is teratogenic in animals, no human reports associating the use of inhaled beclomethasone with human congenital anomalies have been found.
Caffeine (194)
Although the amount of caffeine in commonly used beverages varies widely, caffeine consumption in pregnancy in moderate amounts does not pose a risk to the fetus. When used in moderation, no association with congenital malformations, spontaneous abortions, preterm birth, and low birth weight have been proven.
Ciclesonide (Alvesco) (541)
Ciclesonide is an inhaled corticosteroid. There is no published human pregnancy data but the molecular weight suggests that it will cross the placenta throughout pregnancy. The drug produced no defects in rats but caused fetal toxicity in rabbits. Although the risk may be low because it is inhaled, avoiding it in the first trimester should be considered (see dexamethasone).
Cromolyn sodium (490)
Cromolyn was available as a nasal spray and oral solution, but it is no longer available in the United States. It is poorly absorbed into the systemic circulation. Neither the human nor the animal data suggest a risk of embryo-fetal harm.
Dexamethasone (392)
This is a corticosteroid with potency similar to betamethasone. Because large epidemiologic studies have found positive associations between systemic corticosteroids and nonsyndromic orofacial clefts, it is best to avoid this agent in the first trimester. However, when used for the treatment of asthma, other studies have not found a significantly increased risk of maternal or fetal complications. The difference in these outcomes may be related to the systemic concentrations of the drug.
Dyphylline (254) + guaifenesin (198) (Difil-G Forte) (Dilex-G 400) (Dy-G)
This is an OTC liquid drug taken orally. It has not been studied in pregnant animals, and there is no published human pregnancy data. However, these bronchodilator agents probably can be classified as low risk for the embryo and fetus. Dyphylline alone has been removed from the market.
Fluticasone (539) + vilanterol (Breo Ellipta) (775)
Fluticasone is a corticosteroid and vilanterol is a long acting beta2-adrenergic agonist that are given by inhalation. The molecular weights suggest that the two agents will cross the placenta throughout pregnancy. The drug did not cause fetal harm in animals. There is no published human pregnancy data for this fixed combination.
Fluticasone (539) + umeclidinium (509) + vilanterol (Trelegy Ellipta) (776)
The combination of fluticasone (glucocorticoid), umeclidinium, and vilanterol (long-acting beta2-adrenergic agonists) is given by inhalation. The molecular weights suggest that the three agents will cross the placenta throughout pregnancy. Although the three-drug combination has not been studied in pregnant rats and rabbits, the individual agents did not cause embryo-fetal harm in these species. There is no evidence that these agents, when given by inhalation, will harm the human embryo and/or fetus. No published human pregnancy reports for this fixed combination have been located.
Formoterol + mometasone (Dulera Aerosol) (841 / 521)
This combination is an aerosol product. Formoterol is a long-acting beta2-adrenergic agonist and mometasone is a topical corticosteroid. There is no published human pregnancy data for this fixed combination. The molecular weights suggest that both drugs will cross the placenta throughout pregnancy. In animals given high oral doses, both were teratogenic.
Ipratropium (Atrovent) (430)
Inhaled ipratropium, an anticholinergic bronchodilator, is recommended for asthma in patients not responding adequately to other therapy. It was not teratogenic mice, rats, and rabbits. Although the human pregnancy data is limited, there is no evidence that the drug is hazardous to the fetus. It produces fewer systemic effects then atropine and may have an additive bronchodilatory effect to beta2 agonists.
Isoproterenol (211)
Isoproterenol is a sympathomimetic (bronchodilator) with beta-adrenergic effects that is given intravenously. No reports linking this agent with congenital defects have been located. The drug was not teratogenic in rats and rabbits but was in hamsters.
Levalbuterol (Xopenex HFA) (240)
Levalbuterol is the (R)-enantiomer of racemic albuterol. It is given by inhalation. No reports of its use in human pregnancy have been located. However, racemic albuterol is considered compatible in pregnancy, and there is no apparent reason not to classify levalbuterol the same way. The drug, when given orally, is teratogenic in animals. If levalbuterol is used in pregnancy for the treatment of asthma, health care professionals are encouraged to call the toll-free number (1-877-311-8972) for information about patient enrollment in an Organization of Teratology Specialists study.
Mepolizumab (Nucala) (149,000)
Mepolizumab is given by subcutaneous injection. It is not indicated for status asthmaticus. There is no published human pregnancy data but the molecular weight suggests that it will not cross the placenta in the first half of pregnancy. The drug did not cause defects in monkeys and mice. There is a pregnancy exposure registry that monitors pregnancy outcomes in women with asthma exposed to Nucala during pregnancy. Health care providers can enroll patients or encourage patients to enroll themselves by calling 1-877-311-8972 or visiting www.mothertobaby.org/asthma.
Metaproterenol (521)
Metaproterenol, a selective beta2-adrenergic agonist, is a respiratory (bronchodilator) that is given orally. Use of this agent in pregnancy has not been linked with congenital defects. However, the drug is teratogenic in animals.
Methylprednisolone (Medrol) (374)
This is an oral glucocorticoid. The molecular weight suggests that it will cross the placenta throughout pregnancy. No reports relating to its use in human pregnancy or in pregnant animals have been located. However, teratogenicity is a potential problem (see below). If high doses of the drug are used in pregnancy, the newborn infants should be carefully observed for signs of hypoadrenalism. In addition, all corticosteroids increase calcium excretion.
Methylprednisolone acetate (Depo-Medrol) (417)
This is an injectable glucocorticoid. See below.
Methylprednisolone sodium succinate (Solu-Medrol) (497)
Methylprednisolone is a glucocorticoid given parenterally. The molecular weight suggests that it will cross the placenta throughout pregnancy. As with other corticosteroids, the drug was teratogenic, at doses equivalent to the human dose, in mice, rats, and rabbits. If the drug is used in pregnancy, the newborn infant should be carefully observed for signs of hypoadrenalism. In addition, all corticosteroids increase calcium excretion.
Mometasone + formoterol (Dulera) (321 + 841)
Dulera is a combination product of mometasone (corticosteroid) and formoterol (beta2-adrenergic agonist). There is no published human data for Dulera but the molecular weights suggest that the drugs will cross the placenta. Oral doses of formoterol were not teratogenic in animals but were with mometasone. The limited human pregnancy data with formoterol did not suggest a risk of embryo/fetal harm, but there is no human pregnancy data for mometasone.
Montelukast (Singulair) (608)
Montelukast is a leukotriene receptor antagonist that is given orally. Although the human data are limited, the drug does not appear to cause harm to the embryo and/or fetus. The drug was not teratogenic in rats and rabbits. The manufacturer maintains a pregnancy registry for women exposed to montelukast. Health care professionals are encouraged to report pregnancy exposures to the registry by calling the toll-free number 1-800-986-8999.
Omalizumab (Xolair) (149,000)
Omalizumab is a recombinant DNA–derived humanized immunoglobulin (IgG1k) monoclonal antibody that is administered subcutaneously for patients with moderate to severe persistent asthma. In monkeys, the drug did not cause embryotoxicity or teratogenicity. The human pregnancy data is very limited but does not suggest an increased embryo-fetal risk.
Prednisone (Rayos) (358)
The use of oral prednisone appears to represent a small risk to the developing fetus. One of these risks appears to be orofacial clefts. The drug causes birth defects in rats, mice, rabbits, and hamsters. However, the available evidence supports its use to control various maternal diseases, one of which is asthma.
Reslizumab (Cinqair) (147,000)
Reslizumab is given intravenously. Even though the molecular weight is high, the drug crosses the placenta during pregnancy. In placebo-controlled studies, anaphylaxis occurred in 0.3% of patients receiving the drug. No adverse effects were observed when the drug was given to pregnant mice and rabbits.
Salmeterol (Serevent Diskus) (416)
Salmeterol is a long-acting beta2-adrenergic agonist that is given as an aerosol or dry powder for oral inhalation. Because the drug acts locally in the lung, plasma levels are very low or undetectable and are a result of swallowed salmeterol. The limited human pregnancy data does not suggest risk of embryo-fetal harm. High oral doses in animals were not teratogenic.
Theophylline (180)
Oral theophylline is a methylxanthine that is indicated for the treatment of symptoms of chronic asthma and other chronic lung diseases. According to ACOG, theophylline is not a preferred asthma therapy but considered an alternative agent. No published reports linking the use of theophylline with congenital defects have been located. However, the drug is teratogenic in mice, rats, and rabbits at doses close to the human dose.
Tiotropium (Spiriva Respimat) (490)
Tiotropium, an anticholinergic bronchodilator, is given by oral inhalation only. No reports describing the use of tiotropium during human pregnancy have been located. The animal data suggest low risk. However, because of its long elimination half-life (about 25 hours), use of tiotropium immediately before the diagnosis of an inadvertent pregnancy would most likely result in the exposure of a portion of organogenesis.
Triamcinolone (Kenalog-40) (435)
Triamcinolone is an inhaled corticosteroid with potency slightly greater than prednisone. Although the systemic use of the drug has a small absolute risk of oral clefts and fetal growth restriction, inhaled triamcinolone does not appear to cause embryo-fetal harm. The drug is teratogenic when given orally to animals.
Breastfeeding
It is not known if the above drugs are excreted into breast milk. Agents with relatively low molecular weights will probably be in milk. However, if the maternal levels are low, the amount in milk will probably be very small, if at all. Nevertheless, it is doubtful if any of these agents, even if they are excreted into milk, will have a harmful effect on a nursing infant.
Mr. Briggs is clinical professor of pharmacy at the University of California, San Francisco, and adjunct professor of pharmacy at the University of Southern California, Los Angeles, as well as at Washington State University, Spokane. Mr. Briggs said he had no relevant financial disclosures. Email him at obnews@mdedge.com.
Asthma effects about 10% of pregnant women worldwide. About 10% of these will have severe disease requiring oral corticosteroids. Brief reviews of asthma drugs are shown below.
The trade names (if available) and molecular weights (rounded to the nearest whole number) are shown in parentheses. Nearly all of these drugs will cross the placenta.
Beclomethasone (Beconase AQ) (539)
Either beclomethasone or budesonide was considered the inhaled steroids of choice for use during pregnancy, according to a position statement from a joint committee of the American College of Obstetricians and Gynecologists and the American College of Allergy, Asthma, and Immunology published in 2000. Although the drug is teratogenic in animals, no human reports associating the use of inhaled beclomethasone with human congenital anomalies have been found.
Benralizumab (Fasenra) (150,000)
There is no published human pregnancy data. Based on studies in monkeys, the drug crosses the placenta in the third trimester. It caused no fetal harm in monkeys when given throughout pregnancy. There is a pregnancy exposure registry that monitors pregnancy outcomes in women exposed to the drug during pregnancy. Health care providers can enroll patients or encourage patients to enroll themselves by calling 1-877-311-8972 or visiting mothertobaby.org/Fasenra.
Budesonide (Rhinocort) (431)
Either budesonide or beclomethasone was considered the inhaled steroids of choice for use during pregnancy in a position statement from a joint committee of ACOG and ACAAI published in 2000. Although the drug is teratogenic in animals, no human reports associating the use of inhaled beclomethasone with human congenital anomalies have been found.
Caffeine (194)
Although the amount of caffeine in commonly used beverages varies widely, caffeine consumption in pregnancy in moderate amounts does not pose a risk to the fetus. When used in moderation, no association with congenital malformations, spontaneous abortions, preterm birth, and low birth weight have been proven.
Ciclesonide (Alvesco) (541)
Ciclesonide is an inhaled corticosteroid. There is no published human pregnancy data but the molecular weight suggests that it will cross the placenta throughout pregnancy. The drug produced no defects in rats but caused fetal toxicity in rabbits. Although the risk may be low because it is inhaled, avoiding it in the first trimester should be considered (see dexamethasone).
Cromolyn sodium (490)
Cromolyn was available as a nasal spray and oral solution, but it is no longer available in the United States. It is poorly absorbed into the systemic circulation. Neither the human nor the animal data suggest a risk of embryo-fetal harm.
Dexamethasone (392)
This is a corticosteroid with potency similar to betamethasone. Because large epidemiologic studies have found positive associations between systemic corticosteroids and nonsyndromic orofacial clefts, it is best to avoid this agent in the first trimester. However, when used for the treatment of asthma, other studies have not found a significantly increased risk of maternal or fetal complications. The difference in these outcomes may be related to the systemic concentrations of the drug.
Dyphylline (254) + guaifenesin (198) (Difil-G Forte) (Dilex-G 400) (Dy-G)
This is an OTC liquid drug taken orally. It has not been studied in pregnant animals, and there is no published human pregnancy data. However, these bronchodilator agents probably can be classified as low risk for the embryo and fetus. Dyphylline alone has been removed from the market.
Fluticasone (539) + vilanterol (Breo Ellipta) (775)
Fluticasone is a corticosteroid and vilanterol is a long acting beta2-adrenergic agonist that are given by inhalation. The molecular weights suggest that the two agents will cross the placenta throughout pregnancy. The drug did not cause fetal harm in animals. There is no published human pregnancy data for this fixed combination.
Fluticasone (539) + umeclidinium (509) + vilanterol (Trelegy Ellipta) (776)
The combination of fluticasone (glucocorticoid), umeclidinium, and vilanterol (long-acting beta2-adrenergic agonists) is given by inhalation. The molecular weights suggest that the three agents will cross the placenta throughout pregnancy. Although the three-drug combination has not been studied in pregnant rats and rabbits, the individual agents did not cause embryo-fetal harm in these species. There is no evidence that these agents, when given by inhalation, will harm the human embryo and/or fetus. No published human pregnancy reports for this fixed combination have been located.
Formoterol + mometasone (Dulera Aerosol) (841 / 521)
This combination is an aerosol product. Formoterol is a long-acting beta2-adrenergic agonist and mometasone is a topical corticosteroid. There is no published human pregnancy data for this fixed combination. The molecular weights suggest that both drugs will cross the placenta throughout pregnancy. In animals given high oral doses, both were teratogenic.
Ipratropium (Atrovent) (430)
Inhaled ipratropium, an anticholinergic bronchodilator, is recommended for asthma in patients not responding adequately to other therapy. It was not teratogenic mice, rats, and rabbits. Although the human pregnancy data is limited, there is no evidence that the drug is hazardous to the fetus. It produces fewer systemic effects then atropine and may have an additive bronchodilatory effect to beta2 agonists.
Isoproterenol (211)
Isoproterenol is a sympathomimetic (bronchodilator) with beta-adrenergic effects that is given intravenously. No reports linking this agent with congenital defects have been located. The drug was not teratogenic in rats and rabbits but was in hamsters.
Levalbuterol (Xopenex HFA) (240)
Levalbuterol is the (R)-enantiomer of racemic albuterol. It is given by inhalation. No reports of its use in human pregnancy have been located. However, racemic albuterol is considered compatible in pregnancy, and there is no apparent reason not to classify levalbuterol the same way. The drug, when given orally, is teratogenic in animals. If levalbuterol is used in pregnancy for the treatment of asthma, health care professionals are encouraged to call the toll-free number (1-877-311-8972) for information about patient enrollment in an Organization of Teratology Specialists study.
Mepolizumab (Nucala) (149,000)
Mepolizumab is given by subcutaneous injection. It is not indicated for status asthmaticus. There is no published human pregnancy data but the molecular weight suggests that it will not cross the placenta in the first half of pregnancy. The drug did not cause defects in monkeys and mice. There is a pregnancy exposure registry that monitors pregnancy outcomes in women with asthma exposed to Nucala during pregnancy. Health care providers can enroll patients or encourage patients to enroll themselves by calling 1-877-311-8972 or visiting www.mothertobaby.org/asthma.
Metaproterenol (521)
Metaproterenol, a selective beta2-adrenergic agonist, is a respiratory (bronchodilator) that is given orally. Use of this agent in pregnancy has not been linked with congenital defects. However, the drug is teratogenic in animals.
Methylprednisolone (Medrol) (374)
This is an oral glucocorticoid. The molecular weight suggests that it will cross the placenta throughout pregnancy. No reports relating to its use in human pregnancy or in pregnant animals have been located. However, teratogenicity is a potential problem (see below). If high doses of the drug are used in pregnancy, the newborn infants should be carefully observed for signs of hypoadrenalism. In addition, all corticosteroids increase calcium excretion.
Methylprednisolone acetate (Depo-Medrol) (417)
This is an injectable glucocorticoid. See below.
Methylprednisolone sodium succinate (Solu-Medrol) (497)
Methylprednisolone is a glucocorticoid given parenterally. The molecular weight suggests that it will cross the placenta throughout pregnancy. As with other corticosteroids, the drug was teratogenic, at doses equivalent to the human dose, in mice, rats, and rabbits. If the drug is used in pregnancy, the newborn infant should be carefully observed for signs of hypoadrenalism. In addition, all corticosteroids increase calcium excretion.
Mometasone + formoterol (Dulera) (321 + 841)
Dulera is a combination product of mometasone (corticosteroid) and formoterol (beta2-adrenergic agonist). There is no published human data for Dulera but the molecular weights suggest that the drugs will cross the placenta. Oral doses of formoterol were not teratogenic in animals but were with mometasone. The limited human pregnancy data with formoterol did not suggest a risk of embryo/fetal harm, but there is no human pregnancy data for mometasone.
Montelukast (Singulair) (608)
Montelukast is a leukotriene receptor antagonist that is given orally. Although the human data are limited, the drug does not appear to cause harm to the embryo and/or fetus. The drug was not teratogenic in rats and rabbits. The manufacturer maintains a pregnancy registry for women exposed to montelukast. Health care professionals are encouraged to report pregnancy exposures to the registry by calling the toll-free number 1-800-986-8999.
Omalizumab (Xolair) (149,000)
Omalizumab is a recombinant DNA–derived humanized immunoglobulin (IgG1k) monoclonal antibody that is administered subcutaneously for patients with moderate to severe persistent asthma. In monkeys, the drug did not cause embryotoxicity or teratogenicity. The human pregnancy data is very limited but does not suggest an increased embryo-fetal risk.
Prednisone (Rayos) (358)
The use of oral prednisone appears to represent a small risk to the developing fetus. One of these risks appears to be orofacial clefts. The drug causes birth defects in rats, mice, rabbits, and hamsters. However, the available evidence supports its use to control various maternal diseases, one of which is asthma.
Reslizumab (Cinqair) (147,000)
Reslizumab is given intravenously. Even though the molecular weight is high, the drug crosses the placenta during pregnancy. In placebo-controlled studies, anaphylaxis occurred in 0.3% of patients receiving the drug. No adverse effects were observed when the drug was given to pregnant mice and rabbits.
Salmeterol (Serevent Diskus) (416)
Salmeterol is a long-acting beta2-adrenergic agonist that is given as an aerosol or dry powder for oral inhalation. Because the drug acts locally in the lung, plasma levels are very low or undetectable and are a result of swallowed salmeterol. The limited human pregnancy data does not suggest risk of embryo-fetal harm. High oral doses in animals were not teratogenic.
Theophylline (180)
Oral theophylline is a methylxanthine that is indicated for the treatment of symptoms of chronic asthma and other chronic lung diseases. According to ACOG, theophylline is not a preferred asthma therapy but considered an alternative agent. No published reports linking the use of theophylline with congenital defects have been located. However, the drug is teratogenic in mice, rats, and rabbits at doses close to the human dose.
Tiotropium (Spiriva Respimat) (490)
Tiotropium, an anticholinergic bronchodilator, is given by oral inhalation only. No reports describing the use of tiotropium during human pregnancy have been located. The animal data suggest low risk. However, because of its long elimination half-life (about 25 hours), use of tiotropium immediately before the diagnosis of an inadvertent pregnancy would most likely result in the exposure of a portion of organogenesis.
Triamcinolone (Kenalog-40) (435)
Triamcinolone is an inhaled corticosteroid with potency slightly greater than prednisone. Although the systemic use of the drug has a small absolute risk of oral clefts and fetal growth restriction, inhaled triamcinolone does not appear to cause embryo-fetal harm. The drug is teratogenic when given orally to animals.
Breastfeeding
It is not known if the above drugs are excreted into breast milk. Agents with relatively low molecular weights will probably be in milk. However, if the maternal levels are low, the amount in milk will probably be very small, if at all. Nevertheless, it is doubtful if any of these agents, even if they are excreted into milk, will have a harmful effect on a nursing infant.
Mr. Briggs is clinical professor of pharmacy at the University of California, San Francisco, and adjunct professor of pharmacy at the University of Southern California, Los Angeles, as well as at Washington State University, Spokane. Mr. Briggs said he had no relevant financial disclosures. Email him at obnews@mdedge.com.
Asthma effects about 10% of pregnant women worldwide. About 10% of these will have severe disease requiring oral corticosteroids. Brief reviews of asthma drugs are shown below.
The trade names (if available) and molecular weights (rounded to the nearest whole number) are shown in parentheses. Nearly all of these drugs will cross the placenta.
Beclomethasone (Beconase AQ) (539)
Either beclomethasone or budesonide was considered the inhaled steroids of choice for use during pregnancy, according to a position statement from a joint committee of the American College of Obstetricians and Gynecologists and the American College of Allergy, Asthma, and Immunology published in 2000. Although the drug is teratogenic in animals, no human reports associating the use of inhaled beclomethasone with human congenital anomalies have been found.
Benralizumab (Fasenra) (150,000)
There is no published human pregnancy data. Based on studies in monkeys, the drug crosses the placenta in the third trimester. It caused no fetal harm in monkeys when given throughout pregnancy. There is a pregnancy exposure registry that monitors pregnancy outcomes in women exposed to the drug during pregnancy. Health care providers can enroll patients or encourage patients to enroll themselves by calling 1-877-311-8972 or visiting mothertobaby.org/Fasenra.
Budesonide (Rhinocort) (431)
Either budesonide or beclomethasone was considered the inhaled steroids of choice for use during pregnancy in a position statement from a joint committee of ACOG and ACAAI published in 2000. Although the drug is teratogenic in animals, no human reports associating the use of inhaled beclomethasone with human congenital anomalies have been found.
Caffeine (194)
Although the amount of caffeine in commonly used beverages varies widely, caffeine consumption in pregnancy in moderate amounts does not pose a risk to the fetus. When used in moderation, no association with congenital malformations, spontaneous abortions, preterm birth, and low birth weight have been proven.
Ciclesonide (Alvesco) (541)
Ciclesonide is an inhaled corticosteroid. There is no published human pregnancy data but the molecular weight suggests that it will cross the placenta throughout pregnancy. The drug produced no defects in rats but caused fetal toxicity in rabbits. Although the risk may be low because it is inhaled, avoiding it in the first trimester should be considered (see dexamethasone).
Cromolyn sodium (490)
Cromolyn was available as a nasal spray and oral solution, but it is no longer available in the United States. It is poorly absorbed into the systemic circulation. Neither the human nor the animal data suggest a risk of embryo-fetal harm.
Dexamethasone (392)
This is a corticosteroid with potency similar to betamethasone. Because large epidemiologic studies have found positive associations between systemic corticosteroids and nonsyndromic orofacial clefts, it is best to avoid this agent in the first trimester. However, when used for the treatment of asthma, other studies have not found a significantly increased risk of maternal or fetal complications. The difference in these outcomes may be related to the systemic concentrations of the drug.
Dyphylline (254) + guaifenesin (198) (Difil-G Forte) (Dilex-G 400) (Dy-G)
This is an OTC liquid drug taken orally. It has not been studied in pregnant animals, and there is no published human pregnancy data. However, these bronchodilator agents probably can be classified as low risk for the embryo and fetus. Dyphylline alone has been removed from the market.
Fluticasone (539) + vilanterol (Breo Ellipta) (775)
Fluticasone is a corticosteroid and vilanterol is a long acting beta2-adrenergic agonist that are given by inhalation. The molecular weights suggest that the two agents will cross the placenta throughout pregnancy. The drug did not cause fetal harm in animals. There is no published human pregnancy data for this fixed combination.
Fluticasone (539) + umeclidinium (509) + vilanterol (Trelegy Ellipta) (776)
The combination of fluticasone (glucocorticoid), umeclidinium, and vilanterol (long-acting beta2-adrenergic agonists) is given by inhalation. The molecular weights suggest that the three agents will cross the placenta throughout pregnancy. Although the three-drug combination has not been studied in pregnant rats and rabbits, the individual agents did not cause embryo-fetal harm in these species. There is no evidence that these agents, when given by inhalation, will harm the human embryo and/or fetus. No published human pregnancy reports for this fixed combination have been located.
Formoterol + mometasone (Dulera Aerosol) (841 / 521)
This combination is an aerosol product. Formoterol is a long-acting beta2-adrenergic agonist and mometasone is a topical corticosteroid. There is no published human pregnancy data for this fixed combination. The molecular weights suggest that both drugs will cross the placenta throughout pregnancy. In animals given high oral doses, both were teratogenic.
Ipratropium (Atrovent) (430)
Inhaled ipratropium, an anticholinergic bronchodilator, is recommended for asthma in patients not responding adequately to other therapy. It was not teratogenic mice, rats, and rabbits. Although the human pregnancy data is limited, there is no evidence that the drug is hazardous to the fetus. It produces fewer systemic effects then atropine and may have an additive bronchodilatory effect to beta2 agonists.
Isoproterenol (211)
Isoproterenol is a sympathomimetic (bronchodilator) with beta-adrenergic effects that is given intravenously. No reports linking this agent with congenital defects have been located. The drug was not teratogenic in rats and rabbits but was in hamsters.
Levalbuterol (Xopenex HFA) (240)
Levalbuterol is the (R)-enantiomer of racemic albuterol. It is given by inhalation. No reports of its use in human pregnancy have been located. However, racemic albuterol is considered compatible in pregnancy, and there is no apparent reason not to classify levalbuterol the same way. The drug, when given orally, is teratogenic in animals. If levalbuterol is used in pregnancy for the treatment of asthma, health care professionals are encouraged to call the toll-free number (1-877-311-8972) for information about patient enrollment in an Organization of Teratology Specialists study.
Mepolizumab (Nucala) (149,000)
Mepolizumab is given by subcutaneous injection. It is not indicated for status asthmaticus. There is no published human pregnancy data but the molecular weight suggests that it will not cross the placenta in the first half of pregnancy. The drug did not cause defects in monkeys and mice. There is a pregnancy exposure registry that monitors pregnancy outcomes in women with asthma exposed to Nucala during pregnancy. Health care providers can enroll patients or encourage patients to enroll themselves by calling 1-877-311-8972 or visiting www.mothertobaby.org/asthma.
Metaproterenol (521)
Metaproterenol, a selective beta2-adrenergic agonist, is a respiratory (bronchodilator) that is given orally. Use of this agent in pregnancy has not been linked with congenital defects. However, the drug is teratogenic in animals.
Methylprednisolone (Medrol) (374)
This is an oral glucocorticoid. The molecular weight suggests that it will cross the placenta throughout pregnancy. No reports relating to its use in human pregnancy or in pregnant animals have been located. However, teratogenicity is a potential problem (see below). If high doses of the drug are used in pregnancy, the newborn infants should be carefully observed for signs of hypoadrenalism. In addition, all corticosteroids increase calcium excretion.
Methylprednisolone acetate (Depo-Medrol) (417)
This is an injectable glucocorticoid. See below.
Methylprednisolone sodium succinate (Solu-Medrol) (497)
Methylprednisolone is a glucocorticoid given parenterally. The molecular weight suggests that it will cross the placenta throughout pregnancy. As with other corticosteroids, the drug was teratogenic, at doses equivalent to the human dose, in mice, rats, and rabbits. If the drug is used in pregnancy, the newborn infant should be carefully observed for signs of hypoadrenalism. In addition, all corticosteroids increase calcium excretion.
Mometasone + formoterol (Dulera) (321 + 841)
Dulera is a combination product of mometasone (corticosteroid) and formoterol (beta2-adrenergic agonist). There is no published human data for Dulera but the molecular weights suggest that the drugs will cross the placenta. Oral doses of formoterol were not teratogenic in animals but were with mometasone. The limited human pregnancy data with formoterol did not suggest a risk of embryo/fetal harm, but there is no human pregnancy data for mometasone.
Montelukast (Singulair) (608)
Montelukast is a leukotriene receptor antagonist that is given orally. Although the human data are limited, the drug does not appear to cause harm to the embryo and/or fetus. The drug was not teratogenic in rats and rabbits. The manufacturer maintains a pregnancy registry for women exposed to montelukast. Health care professionals are encouraged to report pregnancy exposures to the registry by calling the toll-free number 1-800-986-8999.
Omalizumab (Xolair) (149,000)
Omalizumab is a recombinant DNA–derived humanized immunoglobulin (IgG1k) monoclonal antibody that is administered subcutaneously for patients with moderate to severe persistent asthma. In monkeys, the drug did not cause embryotoxicity or teratogenicity. The human pregnancy data is very limited but does not suggest an increased embryo-fetal risk.
Prednisone (Rayos) (358)
The use of oral prednisone appears to represent a small risk to the developing fetus. One of these risks appears to be orofacial clefts. The drug causes birth defects in rats, mice, rabbits, and hamsters. However, the available evidence supports its use to control various maternal diseases, one of which is asthma.
Reslizumab (Cinqair) (147,000)
Reslizumab is given intravenously. Even though the molecular weight is high, the drug crosses the placenta during pregnancy. In placebo-controlled studies, anaphylaxis occurred in 0.3% of patients receiving the drug. No adverse effects were observed when the drug was given to pregnant mice and rabbits.
Salmeterol (Serevent Diskus) (416)
Salmeterol is a long-acting beta2-adrenergic agonist that is given as an aerosol or dry powder for oral inhalation. Because the drug acts locally in the lung, plasma levels are very low or undetectable and are a result of swallowed salmeterol. The limited human pregnancy data does not suggest risk of embryo-fetal harm. High oral doses in animals were not teratogenic.
Theophylline (180)
Oral theophylline is a methylxanthine that is indicated for the treatment of symptoms of chronic asthma and other chronic lung diseases. According to ACOG, theophylline is not a preferred asthma therapy but considered an alternative agent. No published reports linking the use of theophylline with congenital defects have been located. However, the drug is teratogenic in mice, rats, and rabbits at doses close to the human dose.
Tiotropium (Spiriva Respimat) (490)
Tiotropium, an anticholinergic bronchodilator, is given by oral inhalation only. No reports describing the use of tiotropium during human pregnancy have been located. The animal data suggest low risk. However, because of its long elimination half-life (about 25 hours), use of tiotropium immediately before the diagnosis of an inadvertent pregnancy would most likely result in the exposure of a portion of organogenesis.
Triamcinolone (Kenalog-40) (435)
Triamcinolone is an inhaled corticosteroid with potency slightly greater than prednisone. Although the systemic use of the drug has a small absolute risk of oral clefts and fetal growth restriction, inhaled triamcinolone does not appear to cause embryo-fetal harm. The drug is teratogenic when given orally to animals.
Breastfeeding
It is not known if the above drugs are excreted into breast milk. Agents with relatively low molecular weights will probably be in milk. However, if the maternal levels are low, the amount in milk will probably be very small, if at all. Nevertheless, it is doubtful if any of these agents, even if they are excreted into milk, will have a harmful effect on a nursing infant.
Mr. Briggs is clinical professor of pharmacy at the University of California, San Francisco, and adjunct professor of pharmacy at the University of Southern California, Los Angeles, as well as at Washington State University, Spokane. Mr. Briggs said he had no relevant financial disclosures. Email him at obnews@mdedge.com.