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Pharmaceuticals 2013, 6(6), 689-699; doi:10.3390/ph6060689
Review

Calcium Channel Blockers as Tocolytics: Principles of Their Actions, Adverse Effects and Therapeutic Combinations

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Received: 4 March 2013; in revised form: 15 April 2013 / Accepted: 2 May 2013 / Published: 23 May 2013
(This article belongs to the Special Issue Calcium Antagonists)
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Abstract: Dihydropyridine Ca2+ channel blockers (CCBs) are widely accepted in the treatment of premature labour. Their mechanism of action in tocolysis involves the blockade of L-type Ca2+ channels, influenced by the Ca2+-activated K+ channels, beta-adrenergic receptors (β-ARs) and sexual hormones. In clinical practice, most experience has been gained with the use of nifedipine, whose efficacy is superior or comparable to those of β-agonists and oxytocin antagonists. Additionally, it has a favourable adverse effect profile as compared with the majority of other tocolytics. The most frequent and well-tolerated side-effects of CCBs are tachycardia, headache and hypotension. In tocolytic therapy efforts are currently being made to find combinations of tocolytic agents that yield better therapeutic action. The available human and animal studies suggest that the combination of CCBs with β-AR agonists is beneficial, although such combinations can pose risk of pulmonary oedema in multiple pregnancies and maternal cardiovascular diseases. Preclinical data indicate the potential benefit of combinations of CCBs and oxytocin antagonists. However, the combinations of CCBs with progesterone or cyclooxygenase inhibitors may decrease their efficacy. The CCBs are likely to remain one of the most important groups of drugs for the rapid inhibition of premature uterine contractions. Their significance may be magnified by further clinical studies on their combined use for tocolysis.
Keywords: nifedipine; preterm labour; tocolysis; combination nifedipine; preterm labour; tocolysis; combination
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Gáspár, R.; Hajagos-Tóth, J. Calcium Channel Blockers as Tocolytics: Principles of Their Actions, Adverse Effects and Therapeutic Combinations. Pharmaceuticals 2013, 6, 689-699.

AMA Style

Gáspár R, Hajagos-Tóth J. Calcium Channel Blockers as Tocolytics: Principles of Their Actions, Adverse Effects and Therapeutic Combinations. Pharmaceuticals. 2013; 6(6):689-699.

Chicago/Turabian Style

Gáspár, Róbert; Hajagos-Tóth, Judit. 2013. "Calcium Channel Blockers as Tocolytics: Principles of Their Actions, Adverse Effects and Therapeutic Combinations." Pharmaceuticals 6, no. 6: 689-699.



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